Cisco Nexus 3548 series Command Reference Manual

www.cisco.com Cisco has more than 200 offices worldwide. Addresses, phone numbers, and fax numbers are listed on the Cisco website at www.cisco.com/go/offices. Cisco Nexus 3548 Switch NX-OS Unicast Routing Command Reference May 2013 Text Part Number: OL-27852-01

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OL-27852-01 C O N T E N T S New and Changed Information xv Preface xvii Audience xvii Document Conventions xvii Related Documentation xviii Documentation Feedback xix Obtaining Documentation and Submitting a Service Request xix Unicast Routing Commands 1 additional-paths receive 2 additional-paths selection 4 additional-paths send 6 address (VRRP) 8 address-family (BGP neighbor) 10 address-family (BGP router) 12 address-family (EIGRP) 14 address-family (RIP) 15 advertise-map (BGP) 16 advertisement-interval (VRRP) 18 aggregate-address (BGP) 20 area authentication (OSPF) 23 area default-cost (OSPF) 25 area filter-list (OSPF) 26 area filter-list (OSPFv3) 28 area nssa (OSPF) 30 area range (OSPF) 32 area stub (OSPF) 34 area virtual-link (OSPF) 36 authentication (HSRP) 38 authentication (OSPF virtual link) 40 authentication (VRRP) 42

OL-27852-01 authentication key-chain (EIGRP) 43 authentication mode (EIGRP) 45 authentication-key (OSPF virtual link) 46 auto-cost (OSPF) 47 autonomous-system 48 bestpath (BGP) 49 bestpath as-path multipath-relax (BGP) 51 capability additional-paths receive 52 capability additional-paths send 54 clear bgp 56 clear bgp dampening 57 clear bgp flap-statistics 59 clear bgp policy statistics aggregate-address 61 clear bgp policy statistics dampening 62 clear bgp policy statistics neighbor 63 clear bgp policy statistics redistribute 64 clear forwarding route 66 clear forwarding inconsistency 67 clear ip adjacency statistics 68 clear ip arp 69 clear ip bgp 71 clear ip bgp dampening 73 clear ip bgp flap-statistics 75 clear ip eigrp accounting 76 clear ip eigrp neighbors 77 clear ip eigrp redistribution 79 clear ip eigrp traffic 80 clear ip interface statistics 81 clear ip ospf neighbor 82 clear ip ospf policy statistics 84 clear ip ospf redistribution 86 clear ip ospf statistics 87 clear ip ospf traffic 88 clear ip rip policy statistics redistribute 89 clear ip rip statistics 91

OL-27852-01 clear ip route 92 clear ip traffic 93 clear sockets statistics 94 clear vrrp 95 client-to-client reflection 96 confederation 97 dampening (BGP) 98 dead-interval (OSPF virtual link) 100 default-information originate (EIGRP) 102 default-information originate (OSPF) 104 default-information originate (RIP) 106 default-metric (EIGRP) 107 default-metric (OSPF) 109 default-metric (RIP) 111 delay minimum 113 delay 114 distance (EIGRP) 115 distance (OSPF) 117 distance (RIP) 118 ebgp-multihop 119 eigrp log-neighbor-changes 120 eigrp log-neighbor-warnings 121 eigrp router-id 122 eigrp stub 123 feature bgp 125 feature eigrp 126 feature hsrp 127 feature ospf 128 feature rip 129 feature vrrp 130 flush-routes (EIGRP) 131 flush-routes (OSPF) 132 hardware ip glean throttle 133 hardware ip glean throttle maximum 134 hardware ip glean throttle syslog 135

OL-27852-01 hardware ip glean throttle timeout 137 hello-interval (OSPF virtual link) 138 hsrp 139 hsrp delay 140 ip (HSRP) 142 ip address 144 ip arp 146 ip arp gratuitous 148 ip arp syslog-threshold 149 ip arp timeout 150 ip as-path access-list 151 ip authentication key-chain eigrp 153 ip authentication mode eigrp 154 ip bandwidth eigrp 156 ip bandwidth-percent eigrp 157 ip community-list 158 ip delay eigrp 161 ip directed-broadcast 162 ip distribute-list eigrp 164 ip eigrp shutdown 165 ip extcommunity-list 166 ip hello-interval eigrp 169 ip hold-time eigrp 170 ip load-sharing address 171 ip local-proxy-arp 172 ip next-hop-self eigrp 173 ip offset-list eigrp 174 ip ospf authentication 176 ip ospf authentication-key 178 ip ospf cost 180 ip ospf dead-interval 181 ip ospf hello-interval 182 ip ospf message-digest-key 183 ip ospf mtu-ignore 185 ip ospf network 186

OL-27852-01 ip ospf passive-interface 187 ip ospf priority 188 ip ospf retransmit-interval 189 ip ospf shutdown 190 ip ospf transmit-delay 191 ip passive-interface eigrp 192 ip port-unreachable 193 ip prefix-list 194 ip prefix-list description 196 ip proxy-arp 197 ip rip authentication key-chain 198 ip rip authentication mode 199 ip rip metric-offset 200 ip rip offset-list 201 ip rip passive-interface 202 ip rip poison-reverse 203 ip rip route-filter 204 ip rip summary-address 205 ip route 206 ip router eigrp 208 ip router ospf area 209 ip router ospf multi-area 210 ip router rip 211 ip split-horizon eigrp 212 ip summary-address eigrp 213 ip tcp path-mtu-discovery 215 ip unreachables 216 log-adjacency-changes (EIGRP) 217 log-adjacency-changes (OSPF) 218 log-neighbor-warnings 219 low-memory exempt 220 mac-list 221 match as-number 223 match as-path 225 match community 227

OL-27852-01 match extcommunity 229 match interface 231 match ip address 233 match ip multicast 235 match ip next-hop prefix-list 237 match ip route-source prefix-list 239 match metric 241 match mac-list 243 match route-type 245 match tag 247 match vlan 249 max-metric router-lsa (OSPF) 251 maxas-limit 253 maximum-paths (BGP) 254 maximum-paths (EIGRP) 255 maximum-paths (RIP) 256 maximum-paths (OSPF) 257 maximum-prefix (BGP) 258 message-digest-key (OSPF virtual link) 261 metric maximum-hops 262 metric weights 263 neighbor 265 network 268 nexthop route-map 269 next-hop-self 271 nexthop trigger-delay 272 no switchport 273 object 274 password (BGP) 276 platform ip verify 278 platform ip verify address 279 platform ip verify length 281 policy statistics enable (OSPF) 283 preempt (HSRP) 284 preempt (VRRP) 286

OL-27852-01 priority (HSRP) 288 priority (VRRP) 290 protocol shutdown (OSPF) 292 redistribute (BGP) 293 redistribute (EIGRP) 295 redistribute (OSPF) 297 redistribute (RIP) 299 redistribute maximum-prefix (EIGRP) 301 redistribute maximum-prefix (OSPF) 303 remote-as 305 restart bgp 306 restart eigrp 307 restart ospf 308 restart rip 309 retransmit-interval (OSPF virtual link) 310 rfc1583compatibility 311 route-map 312 route-reflector-client (BGP) 315 router bgp 316 router eigrp 318 router ospf 319 router rip 320 router-id (EIGRP) 321 router-id (OSPF) 322 routing-context vrf 323 send-community 324 set as-path 325 set comm-list delete 327 set community 329 set dampening 331 set extcommunity 333 set extcomm-list delete 335 set forwarding-address 337 set ip next-hop peer-address 339 set level 340

OL-27852-01 set local-preference 342 set metric 344 set metric-type 346 set origin 348 set path-selection all advertise 350 set tag 351 set weight 353 shutdown (BGP) 355 shutdown (EIGRP) 356 shutdown (OSPF) 357 shutdown (VRRP) 358 soft-reconfiguration inbound (BGP) 359 stub 360 summary-address (OSPF) 362 suppress-inactive 364 template (BGP) 365 test forwarding distribution perf 368 test forwarding inconsistency 369 threshold percentage 370 threshold weight 372 timers active-time 374 timers basic 375 timers lsa-arrival (OSPF) 377 timers lsa-group-pacing (OSPF) 378 timers nsf converge 380 timers nsf route-hold 381 timers nsf signal 383 timers throttle lsa (OSPF) 384 timers throttle spf (OSPF) 386 track (VRRP) 388 track interface 389 track interface (VRRP) 391 track ip route 393 track list 394 transmit-delay (OSPF virtual link) 396

OL-27852-01 vrf context (Layer 2) 397 vrf 399 vrf context (Layer 3) 401 vrf member 402 vrrp 404 Unicast Routing Show Commands 407 show bgp 408 show bgp community 409 show bgp community-list 410 show bgp extcommunity 411 show bgp extcommunity-list 412 show bgp neighbors 413 show bgp sessions 415 show bgp statistics 416 show forwarding 418 show forwarding distribution 420 show forwarding inconsistency 421 show hsrp 422 show hsrp delay 424 show hsrp summary 425 show interface vlan counter 426 show ip adjacency 427 show ip adjacency summary 428 show ip arp 429 show ip arp summary 430 show ip bgp 431 show ip bgp all 433 show ip bgp community 436 show ip bgp community exact-match 438 show ip bgp community-list 439 show ip bgp dampening 440 show ip bgp extcommunity 441 show ip bgp extcommunity-list 442 show ip bgp filter-list 443 show ip bgp flap-statistics 444

OL-27852-01 show ip bgp neighbors 445 show ip bgp nexthop 446 show ip bgp nexthop-database 447 show ip bgp paths 448 show ip bgp peer-policy 449 show ip bgp peer-session 450 show ip bgp peer-template 451 show ip bgp prefix-list 452 show ip bgp received-paths 453 show ip bgp route-map 454 show ip bgp summary 455 show ip client 456 show ip community-list 457 show ip eigrp 458 show ip eigrp accounting 459 show ip eigrp interfaces 460 show ip eigrp neighbors 462 show ip eigrp route 464 show ip eigrp route-map statistics 466 show ip eigrp topology 468 show ip eigrp traffic 470 show ip fib 471 show ip fib distribution 472 show ip interface 473 show ip load-sharing 474 show ip ospf 475 show ip ospf border-routers 476 show ip ospf database 477 show ip ospf interface 480 show ip ospf lsa-content-changed-list 482 show ip ospf neighbors 483 show ip ospf policy statistics area 485 show ip ospf policy statistics redistribute 487 show ip ospf request-list 489 show ip ospf retransmission-list 490

OL-27852-01 show ip ospf route 491 show ip ospf statistics 492 show ip ospf summary-address 493 show ip ospf traffic 494 show ip ospf virtual-links 495 show ip prefix-list 496 show ip process 497 show ip rip 498 show ip rip interface 499 show ip rip neighbor 500 show ip rip policy statistics 501 show ip rip route 503 show ip rip statistics 504 show ip route 505 show ip static-route 506 show ip traffic 507 show mac-list 508 show routing 509 show routing hash 511 show routing memory estimate 512 show routing-context 513 show routing hash 514 show running-config 515 show running-config arp 517 show running-config bgp 519 show running-config eigrp 521 show running-config ospf 522 show sockets client 523 show sockets connection 524 show sockets statistics 525 show startup-config arp 526 show track 527 show vlan id counter 528 show vrrp 530

OL-27852-01 New and Changed Information This chapter provides release-specific information for each new and changed feature in the Cisco Nexus 3548 NX-OS Unicast Routing Command Reference. The latest version of this document is available at the following Cisco website: http://www.cisco.com/en/US/products/ps11541/tsd_products_support_series_home.html To check for additional information about this Cisco NX-OS Release, see the Cisco Nexus 3548 Switch Release Notes available at the following Cisco website: http://www.cisco.com/en/US/products/ps11541/prod_release_notes_list.html Table 1 summarizes the new and changed features for Cisco NX-OS Release 6.x and tells you where they are documented. Table 1 New and Changed Information Feature Description Changed in Release Where Documented BGP Additional Path commands Added description for several new commands in support of BGP Additional Path features. 6.0(2)A1(1) additional-paths receive additional-paths selection additional-paths send capability additional-paths receive capability additional-paths send set path-selection all advertise

OL-27852-01 Chapter New and Changed Information

OL-27852-01 Preface This preface describes the audience, organization, and conventions of the Cisco Nexus 3548 Switch NX-OS Unicast Routing Command Reference . It also provides information on how to obtain related documentation. This preface includes the following sections: • Audience, page xvii • Document Conventions, page xvii • Related Documentation, page xviii • Obtaining Documentation and Submitting a Service Request, page xix Audience This publication is for experienced network administrators who configure and maintain Cisco Nexus Series switches. Document Conventions Command descriptions use these conventions: Convention Description boldface font Commands and keywords are in boldface. italic font Arguments for which you supply values are in italics. [ ] Elements in square brackets are optional. [ x | y | z ] Optional alternative keywords are grouped in brackets and separated by vertical bars. string A nonquoted set of characters. Do not use quotation marks around the string or the string will include the quotation marks.

OL-27852-01 Screen examples use these conventions: This document uses the following conventions: Note Means reader take note. Notes contain helpful suggestions or references to material not covered in the manual. Caution Means reader be careful. In this situation, you might do something that could result in equipment damage or loss of data. Related Documentation Documentation for the Cisco Nexus 3000 Series Switch is available at the following URL: http://www.cisco.com/en/US/products/ps11541/tsd_products_support_series_home.html The documentation set is divided into the following categories: Release Notes The release notes are available at the follwing URL: http://www.cisco.com/en/US/products/ps11541/prod_release_notes_list.html Installation and Upgrade Guides The installation and upgrade guides are available at the following URL: http://www.cisco.com/en/US/products/ps11541/prod_installation_guides_list.html Command References The command references are available at the following URL: http://www.cisco.com/en/US/products/ps11541/prod_command_reference_list.html Technical References The technical references are available at the following URL: http://www.cisco.com/en/US/products/ps11541/prod_technical_reference_list.html screen font Terminal sessions and information that the switch displays are in screen font. boldface screen font Information that you must enter is in boldface screen font. italic screen font Arguments for which you supply values are in italic screen font. < > Nonprinting characters, such as passwords, are in angle brackets. [ ] Default responses to system prompts are in square brackets. !, # An exclamation point (!) or a pound sign (#) at the beginning of a line of code indicates a comment line.

OL-27852-01 Chapter Configuration Guides The configuration guides are available at the following URL: http://www.cisco.com/en/US/products/ps11541/products_installation_and_configuration_guides_list.h tml Error and System Messages The system message reference guide is available at the following URL: http://www.cisco.com/en/US/products/ps11541/products_system_message_guides_list.html Documentation Feedback To provide technical feedback on this document, or to report an error or omission, please send your comments to [email protected]. We appreciate your feedback. Obtaining Documentation and Submitting a Service Request For information on obtaining documentation, submitting a service request, and gathering additional information, see the monthly What’s New in Cisco Product Documentation, which also lists all new and revised Cisco technical documentation: http://www.cisco.com/en/US/docs/general/whatsnew/whatsnew.html Subscribe to the What’s New in Cisco Product Documentation as an RSS feed and set content to be delivered directly to your desktop using a reader application. The RSS feeds are a free service. Cisco currently supports RSS Version 2.0.

OL-27852-01 Unicast Routing Commands This chapter describes the Cisco NX-OS unicast routing commands available on the Cisco Nexus 3548 switch.

OL-27852-01 Chapter Unicast Routing Commands additional-paths receive additional-paths receive To enable BGP additional paths for a prefix to be received from a capable peer, use the additional-paths receive command in address family configuration mode. To disable receiving additional-path capability for the address family, use the no form of this command. additional-paths receive no additional-paths receive Syntax Description This command has no arguments or keywords. Command Default Capability of receiving additional paths is disabled for address family. Command Modes Address family configuration (config-router-af) VRF Neighbor address family configuration Neighbor VPN address family configuration Neighbor IPv6 labeled-unicast address-family configuration Command History Usage Guidelines The additional-paths receive command enables the additional path receive capability for an address family, after successful negotiation with a neighbor. The ability to send and receive additional paths is negotiated between two BGP neighbors during session establishment. This command controls whether the local device can receive additional paths from all neighbors within an address family. This capability applies to all neighbors under the specified address family unless the capability is explicitly disabled with the neighbor additional-paths receive disable command, which overrides the configuration for the address family or template. Use the show ip bgp neighbors command to display whether neighbors are capable of sending or receiving additional paths. Use the show ip bgp command with a network address to display the path selections, path IDs, and the capabilities for advertising and receiving additional paths. Examples In the following example, BGP negotiates with all neighbors in the IPv6 unicast address family to send and receive additional paths: switch (config)# router bgp 65000 switch (config-router)# address-family ipv6 unicast switch (config-router-af)# additional-paths send switch (config-router-af)# additional-paths receive Release Modification 6.0(2)A1(1) This command was introduced.

OL-27852-01 Chapter Unicast Routing Commands additional-paths receive In the following example, the send and receive capability of the neighbor overrides the receive-only capability of the address family: switch (config)# router bgp 65000 switch (config-router)# address-family ipv6 unicast switch (config-router-af)# additional-paths receive switch (config-router-af)# additional-paths selection route-map add_path4 switch (config-router-af)# neighbor 2001:db8::1037 switch (config-router-neighbor)# address-family ipv6 unicast switch (config-router-neighbor-af)# capability additional-paths send switch (config-router-neighbor-af)# capability additional-paths receive Related Commands Command Description additional-paths send Enables BGP additional paths for a prefix to be sent to a capable peer. capability additional-paths receive Configures the receive additional paths capability for the specified neighbor. show ip bgp Displays information about BGP networks, including path selections and path IDs. show ip bgp neighbors Displays information about the TCP and BGP connections to neighbors.

OL-27852-01 Chapter Unicast Routing Commands additional-paths selection additional-paths selection To enable additional paths selection capability for a prefix, use the additional-paths selection command in address family configuration mode. To disable configuring additional paths selection for a prefix, use the no form of this command. additional-paths selection route-map map-name no additional-paths selection route-map map-name Syntax Description This command has no arguments or keywords. Command Default Additional paths selection capability is disabled. Command Modes Address family configuration (config-router-af) VRF address family configuration VPN address family configuration IPv6 labeled-unicast address-family configuration Command History Usage Guidelines Use the additional-paths selection command to enable additional paths selection mode for some or all prefixes. Specify an appropriate route map to calculate backup paths and to enable Prefix Independent Convergence (PIC) functionality. You can optionally configure the set path-selection all advertise command in the route map to advertise all. Examples The following example shows how to enable the selection of additional paths: switch (config)# router bgp 65000 switch (config-router)# address-family ipv6 unicast switch (config-router-af)# additional-paths receive switch (config-router-af)# additional-paths selection route-map add_path4 switch (config-router-af)# neighbor 2001:DB8::1037! switch (config-router-neighbor)# route-map add_path4 permit 10 switch (config-router-neighbor)# set path-selection all advertise Release Modification 6.0(2)A1(1) This command was introduced.

OL-27852-01 Chapter Unicast Routing Commands additional-paths selection Related Commands Command Description set path-selection all advertise Advertises all BGP paths as additional paths to peers if the receive capability is enabled. show ip bgp Displays information about BGP networks, including path selections and path IDs. show ip bgp neighbors Displays information about the TCP and BGP connections to neighbors.

OL-27852-01 Chapter Unicast Routing Commands additional-paths send additional-paths send To enable BGP additional paths for a prefix to be sent to a capable peer, use the additional-paths send command in address family configuration mode. To disable the sending of additional-paths for the address family, use the no form of this command. additional-paths send no additional-paths send Syntax Description This command has no arguments or keywords. Command Default Capability of sending additional paths is disabled for address family. Command Modes Address family configuration (config-router-af) VRF Neighbor address family configuration Neighbor VPN address family configuration Neighbor IPv6 labeled-unicast address-family configuration Command History Usage Guidelines The additional-paths send command enables the additional path send capability for an address family, after successful negotiation with a neighbor. The ability to send and receive additional paths is negotiated between two BGP neighbors during session establishment. This command controls whether the local device can send additional paths to all neighbors within an address family. This capability applies to all neighbors under the specified address family unless the capability is explicitly disabled with the capability additional-paths send disable command, which overrides the configuration for the address family or template. Use the show ip bgp neighbors command to display whether neighbors are capable of sending or receiving additional paths. Use the show ip bgp command with a network address to display the path selections, path IDs, and the capabilities for advertising and receiving additional paths. Examples In the following example, BGP negotiates with each neighbor in the IPv6 unicast address family to send and receive additional paths: switch# configure terminal switch (config)# router bgp 65000 switch (config-router)# address-family ipv6 unicast switch (config-router-af)# additional-paths send Release Modification 6.0(2)A1(1) This command was introduced.

OL-27852-01 Chapter Unicast Routing Commands additional-paths send In the following example, the send and receive capability of the neighbor overrides the send-only capability of the address family: switch# configure terminal switch (config)# router bgp 65000 switch (config-router)# address-family ipv6 unicast switch (config-router-af)# additional-paths send switch (config-router-af)# additional-paths selection route-map add_path4 switch (config-router-af)# neighbor 2001:db8::1037 switch (config-router-neighbor)# address-family ipv6 unicast switch (config-router-neighbor-af)# capability additional-paths send switch (config-router-neighbor-af)# capability additional-paths receive Related Commands Command Description additional-paths receive Enables BGP additional paths for a prefix to be received from a capable peer. capability additional-paths send Configures the send additional paths capability for the specified neighbor. show ip bgp Displays information about BGP networks, including path selections and path IDs. show ip bgp neighbors Displays information about the TCP and BGP connections to neighbors.

OL-27852-01 Chapter Unicast Routing Commands address (VRRP) address (VRRP) To add a single, primary IP address to a virtual router, use the address command. To remove an IP address from a virtual router, use the no form of this command. address ip-address [secondary] no address [ip-address [secondary]] Syntax Description Command Default None Command Modes VRRP configuration mode Command History Usage Guidelines You can configure one virtual router IP address for a virtual router. If the configured IP address is the same as the interface IP address, this switch automatically owns the IP address. You can configure an IPv4 address only. The master VRRP router drops the packets addressed to the virtual router's IP address because the virtual router is only intended as a next-hop router to forward packets. In NX-OS devices, some applications require that packets addressed to the virtual router's IP address be accepted and delivered. By using the secondary option to the virtual router IPv4 address, the VRRP router will accept these packets when it is the master. This command requires the LAN Base Services license. Examples This example shows how to configure a virtual router IP address: switch# configure terminal switch(config)# interface ethernet 2/1 switch(config-if)# no switchport switch(config-if)# vrrp 250 switch(config-if-vrrp)# address 10.0.0.10 This example shows how to remove all the IP addresses (primary and secondary) using a single command: switch# configure terminal switch(config)# interface ethernet 2/1 switch(config-if)# no switchport switch(config-if)# vrrp 250 ip-address Virtual router address (IPv4). This address should be in the same subnet as the interface IP address. secondary (Optional) Specifies a secondary virtual router address. Release Modified 5.0(3)A1(1) This command was introduced.

OL-27852-01 Chapter Unicast Routing Commands address (VRRP) switch(config-if-vrrp)# no address switch(config-if-vrrp)# show running-config interface ethernet 9/10 Related Commands Command Description clear vrrp Clears all the software counters for the specified virtual router. show vrrp Displays VRRP configuration information. vrrp Configures a VRRP group.

OL-27852-01 Chapter Unicast Routing Commands address-family (BGP neighbor) address-family (BGP neighbor) To enter the neighbor address family mode address-family mode and configure submode commands for the Border Gateway Protocol (BGP), use the address-family command. To disable the address family submode for configuring routing protocols, use the no form of this command. address-family ipv4 {multicast | unicast} no address-family ipv4 {multicast | unicast} Syntax Description Command Default This command has no default settings. Command Modes Neighbor configuration mode Command History Usage Guidelines Use the address-family command to enter various address family configuration modes while configuring BGP routing. When you enter the address-family command from neighbor configuration mode, you enable the neighbor address family and enter the neighbor address family configuration mode. The prompt changes to switch(config-router-neighbor-af)#. You must configure the address families if you are using route redistribution, load balancing, and other advanced features. IPv4 neighbor sessions support IPv4 unicast and multicast address families. This command requires the LAN Enterprise Services license. Examples This example shows how to activate IPv4 multicast for neighbor 192.0.2.1 and place the device in neighbor address family configuration mode for the IPv4 multicast address family: switch# configure terminal switch(config)# feature bgp switch(config)# router bgp 64496 switch(config-router)# neighbor 192.0.2.1 remote-as 64496 switch(config-router-neighbor)# address-family ipv4 multicast switch(config-router-neighbor-af) ipv4 Specifies the IPv4 address family. multicast Specifies multicast address support. unicast Specifies unicast address support. Release Modification 5.0(3)A1(1) This command was introduced.

OL-27852-01 Chapter Unicast Routing Commands address-family (BGP neighbor) Related Commands Command Description advertise-map Configures BGP conditional advertisement. default-originate (BGP) Configures a BGP routing process to distribute a default route. feature bgp Enables BGP configuration. maximum-prefix Controls how many prefixes can be received from a neighbor. route-reflector-client Configures the router as a BGP route reflector. soft-reconfiguration inbound Configures the switch software to start storing BGP peer updates. suppress-inactive Advertises only active routes to peer.

OL-27852-01 Chapter Unicast Routing Commands address-family (BGP router) address-family (BGP router) To enter the address family mode or a virtual routing and forwarding (VRF) address-family mode and configure submode commands for the Border Gateway Protocol (BGP), use the address-family command. To disable the address family submode for configuring routing protocols, use the no form of this command. address-family ipv4 {multicast | unicast} no address-family ipv4 {multicast | unicast} Syntax Description Command Default This command has no default settings. Command Modes Router configuration mode VRF configuration mode Command History Usage Guidelines Use the address-family command to enter various address family configuration modes while configuring BGP routing. When you enter the address-family command from router configuration mode, you enable the address family and enter global address family configuration mode. The prompt changes to switch(config-router-af)#. You must configure the address families if you are using route redistribution, address aggregation, load balancing, and other advanced features. IPv4 neighbor sessions support IPv4 unicast and multicast address families. This command requires the LAN Enterprise Services license. Examples This example shows how to place the router in global address family configuration mode for the IPv4 unicast address family: switch# configure terminal switch(config)# feature bgp switch(config)# router bgp 64496 switch(config-router)# address-family ipv4 unicast switch(config-router-af)# ipv4 Specifies the IPv4 address family. multicast Specifies multicast address support. unicast Specifies unicast address support. Release Modification 5.0(3)A1(1) This command was introduced.

OL-27852-01 Chapter Unicast Routing Commands address-family (BGP router) Related Commands Command Description aggregate-address Configures BGP summary addresses. client-to-client reflection Configures route reflection. dampening Configures route flap dampening. default-metric (BGP) Configures the default metric for routes redistributed into BGP. distance (BGP) Configures the administrative distance. feature bgp Enables BGP configuration. maximum-paths (BGP) Configures the maximum number of equal-cost paths. network Configures an IP prefix to advertise. nexthop route-map Configures route policy filtering for next hops. nexthop trigger-delay Configures the BGP delay for triggering next-hop calculations. redistribute (BGP) Configures route redistribution for BGP. suppress-inactive Advertises active routes to a BGP peer. timers (BGP) Configures the BGP timers.

OL-27852-01 Chapter Unicast Routing Commands address-family (EIGRP) address-family (EIGRP) To configure an address family for the Enhanced Interior Gateway Routing Protocol (EIGRP), use the address-family command. To remove an address family, use the no form of this command. address-family ipv4 unicast no address-family ipv4 unicast Syntax Description Command Default None Command Modes Router configuration mode Address family configuration mode Command History Usage Guidelines This command requires the LAN Base Services license. Examples This example shows how to set the IPv4 unicast address family for an EIGRP instance: switch# configure terminal switch(config)# router eigrp 201 switch(config-router)# address-family ipv4 unicast switch(config-router)# Related Commands ipv4 Specifies the IPv4 address family. unicast Specifies unicast address support. Release Modification 5.0(3)A1(1) This command was introduced. Command Description default-information Controls the distribution of a default route. default-metric Configures the default metric for routes redistributed into EIGRP. distance Configures the administrative distance. maximum-paths Configures the maximum number of equal-cost paths. redistribute Configures route redistribution for EIGRP. router-id Configures the router ID. show ip eigrp Displays EIGRP information. timers Configures the EIGRP timers.

OL-27852-01 Chapter Unicast Routing Commands address-family (RIP) address-family (RIP) To configure an address family for the Routing Information Protocol (RIP), use the address-family command in router configuration mode. address-family ipv4 unicast Syntax Description Command Default This command has no default settings. Command Modes Router configuration mode Command History Usage Guidelines This command does not require a license. Examples This example shows how to set the IPv4 unicast address family for a RIP instance: switch# configure terminal switch(config)# router rip Enterprise switch(config-router)# address-family ipv4 unicast switch(config-router)# Related Commands ipv4 Specifies the IPv4 address family. unicast Specifies unicast address support. Release Modification 5.0(3)A1(1) This command was introduced. Command Description default-information Controls the distribution of a default route. default-metric Configures the default metric for routes redistributed into RIP. distance Configures the administrative distance. maximum-paths Configures the maximum number of equal-cost paths. redistribute Configures route redistribution for RIP. show ip rip Displays a summary of RIP information for all RIP instances. timers Configures the RIP timers.

OL-27852-01 Chapter Unicast Routing Commands advertise-map (BGP) advertise-map (BGP) To configure Border Gateway Protocol (BGP) conditional advertisement, use the advertise-map command. To remove BGP conditional advertisement, use the no form of this command. advertise-map adv-map {exist-map exist-rmap | non-exist-map nonexist-rmap} Syntax Description Command Default None Command Modes BGP neighbor address-family command mode Command History Usage Guidelines Use the advertise-map command to conditionally advertise selected routes. The routes or prefixes that BGP conditionally advertises are defined in two route maps, the adv-map and an exist-map or nonexist-map. The exist-map or nonexist-map specifies the prefix that the BGP tracks. The adv-map specifies the prefix that BGP advertises to the specified neighbor when the condition is met. This command requires the LAN Enterprise Services license. Examples This example shows how to configure BGP conditional advertisement: switch# configure terminal switch(config)# router bgp 65536 switch(config-router)# neighbor 192.0.2.2 remote-as 65537 switch(config-router-neighbor)# address-family ipv4 unicast switch(config-router-neighbor-af)# advertise-map advertise exist-map exist switch(config-router-neighbor-af)# exit switch(config-router-neighbor)# exit switch(config-router)# exit switch(config)# route-map advertise switch(config-route-map)# match as-path pathList switch(config-route-map)# exit switch(config)# route-map exit switch(config-route-map)# match ip address prefix-list plist adv-map Route map with match statements that the route must pass before BGP passes theroute to the next route map. The adv-map is a case-sensitive, alphanumeric string up to 63 characters. exist-map exist-rmap Specifies a route map with match statements for a prefix list. A prefix in the BGP table must match a prefix in the prefix list before BGP will advertise the route. The exist-rmap is a case-sensitive, alphanumeric string up to 63 characters. non-exist-map nonexist-rmap Specifies a route map with match statements for a prefix list. A prefix in the BGP table must not match a prefix in the prefix list before BGP will advertise the route. The nonexist-rmap is a case-sensitive, alphanumeric string up to 63 characters. Release Modification 5.0(3)A1(1) This command was introduced.

OL-27852-01 Chapter Unicast Routing Commands advertise-map (BGP) switch(config-route-map)# exit switch(config)# ip prefix-list plist permit 209.165.201.0/27 switch(config)# Related Commands Command Description feature bgp Enables BGP. neighbor Configures a BGP peer. show ip bgp Displays BGP configuration information.

OL-27852-01 Chapter Unicast Routing Commands advertisement-interval (VRRP) advertisement-interval (VRRP) To specify the time interval between the advertisement packets that are being sent to other Virtual Router Redundancy Protocol (VRRP) routers in the same group, use the advertisement-interval command. To return to the default interval value of 1 second, use the no form of this command. advertisement-interval seconds no advertisement-interval [seconds] Syntax Description Command Default 1 second Command Modes VRRP configuration mode Command History Usage Guidelines VRRP advertisements communicate the priority and state of the virtual router master. The advertisements are encapsulated in IP packets and are sent to the IPv4 multicast address that is assigned to the VRRP group. VRRP uses a dedicated Internet Assigned Numbers Authority (IANA) standard multicast address (224.0.0.18) for VRRP advertisements. This addressing scheme minimizes the number of routers that must service the multicasts and allows test equipment to accurately identify VRRP packets on a segment. The IANA-assigned VRRP IP protocol number is 112. This command does not require a license. Examples This example shows how to specify an advertisement interval of 200 seconds for VRRP group 250: switch# configure terminal switch(config)# interface ethernet 2/1 switch(config-if)# no switchport switch(config-if)# vrrp 250 switch(config-if-vrrp)# advertisement-interval 200 switch(config-if-vrrp)# Related Commands seconds Number of seconds between advertisement frames being sent. For IPv4, the range is from 1 to 255 seconds. Release Modified 5.0(3)A1(1) This command was introduced. Command Description clear vrrp Clears all the software counters for the specified virtual router.

OL-27852-01 Chapter Unicast Routing Commands advertisement-interval (VRRP) show vrrp Displays VRRP configuration information. vrrp Configures a VRRP group. Command Description

OL-27852-01 Chapter Unicast Routing Commands aggregate-address (BGP) aggregate-address (BGP) To create a summary address in a Border Gateway Protocol (BGP) routing table, use the aggregate-address command. To remove the summary address, use the no form of this command. aggregate-address address/length [advertise-map map-name] [as-set] [attribute-map map-name] [summary-only] [suppress-map map-name] no aggregate-address address/length [advertise-map map-name] [as-set] [attribute-map map-name] [summary-only] [suppress-map map-name] Syntax Description Command Default The atomic aggregate attribute is set automatically when an aggregate route is created with this command unless the as-set keyword is specified. Command Modes Address-family configuration mode Command History Usage Guidelines You can implement aggregate routing in BGP either by redistributing an aggregate route into BGP, or by using the conditional aggregate routing feature. Using the aggregate-address command with no keywords will create an aggregate entry in the BGP routing table if any more-specific BGP routes are available that fall within the specified range. (A longer prefix which matches the aggregate must exist in the RIB.) The aggregate route will be advertised as coming from your autonomous system and will have the atomic aggregate attribute set to show that information might be missing. (By default, the atomic aggregate attribute is set unless you specify the as-set keyword.) address/length Aggregate IPv4 address and mask length. Valid value for length is 1 to 32. advertise-map map-name (Optional) Specifies the name of the route map used to select attribute information from specific routes. as-set (Optional) Generates the autonomous system set path information and community information from the contributing paths. attribute-map map-name (Optional) Specifies the name of the route map used to set the attribute information for specific routes. The map-name is an alphanumeric string up to 63 characters. summary-only (Optional) Filters all more-specific routes from updates. suppress-map map-name (Optional) Specifies the name of the route map used to conditionally filter more specific routes. The map-name is an alphanumeric string up to 63 characters. Release Modification 5.0(3)A1(1) This command was introduced.

OL-27852-01 Chapter Unicast Routing Commands aggregate-address (BGP) Using the as-set keyword creates an aggregate entry using the same rules that the command follows without this keyword, but the path advertised for this route will be an AS_SET consisting of all elements contained in all paths that are being summarized. Do not use this form of the aggregate-address command when aggregating many paths, because this route must be continually withdrawn and updated as autonomous system path reachability information for the summarized routes changes. Using the summary-only keyword not only creates the aggregate route (for example, 192.*.*.*) but also suppresses advertisements of more-specific routes to all neighbors. If you want to suppress only advertisements to certain neighbors, you may use the neighbor distribute-list command, with caution. If a more-specific route leaks out, all BGP routers will prefer that route over the less-specific aggregate you are generating (using longest-match routing). Using the suppress-map keyword creates the aggregate route but suppresses advertisement of specified routes. You can use the match clauses of route maps to selectively suppress some more-specific routes of the aggregate and leave others unsuppressed. IP access lists and autonomous system path access lists match clauses are supported. Using the advertise-map keyword selects specific routes that will be used to build different components of the aggregate route, such as AS_SET or community. This form of the aggregate-address command is useful when the components of an aggregate are in separate autonomous systems and you want to create an aggregate with AS_SET, and advertise it back to some of the same autonomous systems. You must remember to omit the specific autonomous system numbers from the AS_SET to prevent the aggregate from being dropped by the BGP loop detection mechanism at the receiving router. IP access lists and autonomous system path access lists match clauses are supported. Using the attribute-map keyword allows attributes of the aggregate route to be changed. This form of the aggregate-address command is useful when one of the routes forming the AS_SET is configured with an attribute such as the community no-export attribute, which would prevent the aggregate route from being exported. An attribute map route map can be created to change the aggregate attributes. This command requires the LAN Enterprise Services license. Examples AS-Set Example This example shows how to create an aggregate BGP address in router configuration mode. The path advertised for this route will be an AS_SET consisting of all elements contained in all paths that are being summarized. switch# configure terminal switch(config)# router bgp 64496 switch(config-router)# aggregate-address 10.0.0.0 255.0.0.0 as-set switch(config-router)# Summary-Only Example This example shows how to create an aggregate BGP address in address family configuration mode and apply it to the multicast database (SAFI) under the IP Version 4 address family. Because the summary-only keyword is configured, more-specific routes are filtered from updates. switch# configure terminal switch(config)# router bgp 64496 switch(config-router)# address-family ipv4 multicast switch(config-router-af)# aggregate-address 10.0.0.0 255.0.0.0 summary-only switch(config-router-af)#

OL-27852-01 Chapter Unicast Routing Commands aggregate-address (BGP) Conditional Aggregation Example This example shows how to create a route map called MAP-ONE to match on an as-path access list. The path advertised for this route will be an AS_SET consisting of elements contained in paths that are matched in the route map. switch# configure terminal switch(config)# ip as-path access-list 1 deny ^1234_ switch(config)# ip as-path access-list 1 permit .* switch(config)# route-map MAP-ONE switch(config-route-map)# match ip as-path 1 switch(config-route-map)# exit switch(config)# router bgp 64496 switch(config-router)# address-family ipv4 switch(config-router-af)# aggregate-address 10.0.0.0 255.0.0.0 as-set advertise-map MAP-ONE switch(config-router-af)# end switch(config-router-af)# Related Commands Command Description route-map map-name Creates a route map.

OL-27852-01 Chapter Unicast Routing Commands area authentication (OSPF) area authentication (OSPF) To enable authentication for an Open Shortest Path First (OSPF) area, use the area authentication command. To remove authentication for an area, use the no form of this command. area area-id authentication [message-digest] no area area-id authentication [message-digest] Syntax Description Command Default No authentication Command Modes Router configuration mode Command History Usage Guidelines Use the area authentication command to configure the authentication mode for the entire OSPF area. The authentication type and authentication password must be the same for all OSPF devices in an area. Use the ip ospf authentication-key command in interface configuration mode to specify this password. If you enable MD5 authentication with the message-digest keyword, you must configure a password with the ip ospf message-digest-key command in interface configuration mode. This command requires the LAN Base Services license. Examples This example shows how to configure authentication for area 0 of OSPF routing process 201: switch# configure terminal switch(config)# router ospf 201 switch(config-router)# area 0 authentication message-digest switch(config-router)# interface ethernet 1/1 switch(config-if)# ip ospf area 0 switch(config)-if# ip ospf message-digest-key 10 md5 0 adcdefgh switch(config-if)# area-id Identifier for the OSPF area where you want to enable authentication. Specify as either a positive integer value or an IP address. message-digest (Optional) Enables Message Digest 5 (MD5) authentication on the area specified by the area-id argument. Release Modification 5.0(3)A1(1) This command was introduced.

OL-27852-01 Chapter Unicast Routing Commands area authentication (OSPF) Related Commands Command Description copy running-config startup-config Saves the configuration changes to the startup configuration file. ip ospf authentication-key Assigns a password for simple password authentication for OSPF. ip ospf message-digest-key Assigns a password for OSPF MD5 authentication. show ip ospf interface Displays OSPF interface-related information.

OL-27852-01 Chapter Unicast Routing Commands area default-cost (OSPF) area default-cost (OSPF) To specify a cost for the default summary route sent into an Open Shortest Path First (OSPF) stub or not-so-stubby area (NSSA), use the area default-cost command. To remove the assigned default route cost, use the no form of this command. area area-id default-cost cost no area area-id default-cost cost Syntax Description Command Default The summary route cost is based on the area border router that generated the summary route. Command Modes Router configuration mode Command History Usage Guidelines Use the area default-cost command on an Area Border Router (ABR) attached to a stub or NSSA to configure the metric for the summary default route generated by the ABR into the stub area. This command requires the LAN Base Services license. Examples This example shows how to set a default cost of 20 to stub network 192.0.2.0: switch# configure terminal switch(config)# router ospf 201 switch(config-router)# area 192.0.2.0 stub switch(config-router)# area 192.0.2.0 default-cost 20 switch(config-router)# Related Commands area-id Identifier for the OSPF area where you want to configure the default cost. The area ID can be from 0 to 4294967295 or an IP address. cost Cost for the default summary route used for a stub or NSSA. The range is from 0 to 16777215. Release Modification 5.0(3)A1(1) This command was introduced. Command Description area stub Defines an area as a stub area. copy running-config startup-config Saves the configuration changes to the startup configuration file. show ip ospf Displays OSPF information.

OL-27852-01 Chapter Unicast Routing Commands area filter-list (OSPF) area filter-list (OSPF) To filter prefixes advertised in type 3 link-state advertisements (LSAs) between Open Shortest Path First (OSPF) areas of an Area Border Router (ABR), use the area filter-list command. To change or cancel the filter, use the no form of this command. area area-id filter-list route-map map-name {in | out} no area area-id filter-list route-map map-name {in | out} Syntax Description Command Default None Command Modes Router configuration mode Command History Usage Guidelines Use the area filter-list command to filter Type 3 LSAs. If you apply the route map with the in keyword, the route map filters all Type 3 LSAs originated by the ABR to this area, including Type 3 LSAs that originated as a result of the area range command in another area. If you apply the route map with the out keyword, the route map filters all Type 3 LSAs that are advertised by the ABR to all other areas including Type 3 LSAs that originate locally as a result of the area range command configured in this area. Cisco NX-OS implicitly denies any prefix that does not match an entry in the route map. This command requires the LAN Base Services license. Examples This example shows how to filter prefixes that are sent from all other areas to area 1: switch# configure terminal switch(config)# router ospf 202 switch(config-router)# area 1 filter-list route-map FilterExternal in switch(config-router)# area-id Identifier for the OSPF area where you want to configure filtering. Specify as either a positive integer value or an IP address. route-map map-name Specifies the name of a route map used as the filter policy. The map-name argument can be any alphanumeric string of up to 63 characters. in Filters networks sent to this area. out Filters networks sent from this area. Release Modification 5.0(3)A1(1) This command was introduced.

OL-27852-01 Chapter Unicast Routing Commands area filter-list (OSPF) Related Commands Command Description area range Consolidates and summarizes routes at an area boundary. copy running-config startup-config Saves the configuration changes to the startup configuration file. route-map Defines the conditions for redistributing routes from one routing protocol into another. show ip ospf policy statistics area Displays OSPF policy statistics for an area.

OL-27852-01 Chapter Unicast Routing Commands area filter-list (OSPFv3) area filter-list (OSPFv3) To filter prefixes that are advertised in type 3 link-state advertisements (LSAs) between Open Shortest Path First (OSPF) areas of an Area Border Router (ABR), use the area filter-list command. To change or cancel the filter, use the no form of this command. area area-id filter-list route-map map-name {in | out} no area area-id filter-list route-map map-name {in | out} Syntax Description Defaults None Command Modes Router configuration mode Command History Usage Guidelines Use the area filter-list command to filter Type 3 LSAs. If you apply the route map with the in keyword, the route map filters all Type 3 LSAs that are originated by the ABR to this area, including Type 3 LSAs that originated as a result of the area range command in another area. If you apply the route map with the out keyword, the route map filters all Type 3 LSAs that are advertised by the ABR to all other areas including Type 3 LSAs that originate locally as a result of the area range command configured in this area. The Cisco NX-OS software implicitly denies any prefix that does not match an entry in the route map. This command requires the LAN Base Services license. Examples This example shows how to filter prefixes that are sent from all other areas to 0.0.0.10: switch# configure terminal switch(config)# router ospfv3 123 switch(config-router)# address-family ipv4 unicast switch(config-router-af)# area 0.0.0.10 filter-list route-map LSA-Filter in switch(config-router-af)# This example shows how change or cancel the filter: area-id Area ID as a numeric value or the IP address. route-map Specifies the route map policy name. map-name Route map name. A route map name can be any alphanumeric string up to 63 characters. in Filters networks sent to this area. out Filters networks sent from this area. Release Modification 5.0(3)A1(1) This command was introduced.

OL-27852-01 Chapter Unicast Routing Commands area filter-list (OSPFv3) switch(config-router-af)# no area 0.0.0.10 filter-list route-map LSA-Filter in switch(config-router-af)#

OL-27852-01 Chapter Unicast Routing Commands area nssa (OSPF) area nssa (OSPF) To configure an area as an Open Shortest Path First (OSPF) not-so-stubby (NSSA) area, use the area nssa command. To remove the NSSA area, use the no form of this command. area area-id nssa [default-information-originate [route-map map-name]] [no-redistribution] [no-summary] [translate type7 [always | never] [suppress-fa]] no area area-id nssa [default-information-originate [route-map map-name]] [no-redistribution] [no-summary] [translate type7 [always | never] [suppress-fa]] Syntax Description Command Default None Command Modes Router configuration mode Command History Usage Guidelines Use the area nssa command to create an NSSA area in an OSPF autonomous system. We recommend that you understand the network topology before configuring forwarding address suppression for translated LSAs. Suboptimal routing might result because there might be better paths to reach the destination’s forwarding address. This command requires the LAN Base Services license. area-id Identifier for the OSPF NSSA area. The area ID can be from 0 to 4294967295 or an IP address. default-information- originate (Optional) Generates a Type 7 default into the NSSA area. This keyword takes effect only on NSSA area border router (ABR) or NSSA autonomous system border router (ASBR). route-map map-name (Optional) Filters the Type 7 default generation based on the route map. The map-name argument can be any alphanumeric string up to 63 characters. no-redistribution (Optional) Blocks redistributed link-state advertisements (LSAs) from entering this NSSA area. Use this keyword when the router is both an NSSA ASBR and an NSSA ABR and you want the redistribute command to import routes into the normal areas but not into the NSSA area. no-summary (Optional) Allows an area to be an NSSA area but not have summary routes injected into it. translate type7 (Optional) Translates Type 7 LSAs to type 5 LSAs. always (Optional) Always translates LSAs. never (Optional) Never translates LSAs. suppress-fa (Optional) Suppresses the forwarding address in translated LSAs. The ABR uses 0.0.0.0 as the forwarding IPv4 address. Release Modification 5.0(3)A1(1) This command was introduced.

OL-27852-01 Chapter Unicast Routing Commands area nssa (OSPF) Examples This example shows how to configure area 1 as an NSSA area: switch# configure terminal switch(config)# router ospf 10 switch(config-router)# area 1 nssa switch(config-router)# This example shows how to configure area 1 as an NSSA area and translate Type 7 LSAs from area 1 to Type 5 LSAs, but not place the Type 7 forwarding address into the Type 5 LSAs. (OSPF places 0.0.0.0 as the forwarding address in the Type 5 LSAs.) switch# configure terminal switch(config)# router ospf 2 switch(config-router)# area 1 nssa translate type7 suppress-fa switch(config-router)# Related Commands Command Description copy running-config startup-config Saves the configuration changes to the startup configuration file. redistribute Redistributes routes learned from one routing protocol to another routing protocol domain. show ip ospf Displays OSPF information.

OL-27852-01 Chapter Unicast Routing Commands area range (OSPF) area range (OSPF) To consolidate and summarize routes at an Open Shortest Path First (OSPF) area boundary, use the area range command. To disable this function, use the no form of this command. area area-id range ip-prefix [not-advertise] [cost cost] no area area-id range ip-prefix [not-advertise] [cost cost] Syntax Description Command Default Disabled Command Modes Router configuration mode Command History Usage Guidelines Use the area range command only with Area Border Routers (ABRs) to consolidate or summarize routes for an area. The ABR advertises that a single summary route is advertised to other areas and condenses routing information at area boundaries. You can configure OSPF to summarize addresses for many different sets of address ranges by configuring multiple area range commands. This command requires the LAN Base Services license. Examples This example shows how to configure one summary route to be advertised by the ABR to other areas for all hosts on network 192.0.2.0: switch# configure terminal switch(config-if)# interface ethernet 1/2 switch(config-if)# ip address 192.0.2.201 255.255.255.0 switch(config-if)# ip ospf area 201 switch(config-router)# area 0 range 192.0.2.0 255.255.0.0 switch(config-router)# area-id Identifier for the OSPF area where you want to summarize routes. The area ID can be from 0 to 4294967295 or an IP address. cost (Optional) Specifies the cost to use during shortest path first (SPF) calculation for the summarized route. cost-value Cost value. The range is from 0 to 16777215. ip-prefix IP prefix specified as IP address/subnet mask length (A.B.C.D/LEN). not-advertise (Optional) Sets the address range status to DoNotAdvertise. The Type 3 summary LSA is suppressed, and the component networks remain hidden from other networks. Release Modification 5.0(3)A1(1) This command was introduced.

OL-27852-01 Chapter Unicast Routing Commands area range (OSPF) Related Commands Command Description copy running-config startup-config Saves the configuration changes to the startup configuration file. show ip ospf Displays OSPF information.

OL-27852-01 Chapter Unicast Routing Commands area stub (OSPF) area stub (OSPF) To define an area as an Open Shortest Path First (OSPF) stub area, use the area stub command. To remove the area, use the no form of this command. area area-id stub [no-summary] no area area-id stub [no-summary] Syntax Description Command Default None Command Modes Router configuration mode Command History Usage Guidelines Use the area stub command to configure all devices attached to the stub area. Use the area default-cost command on an area border router (ABR) attached to the stub area. The area default-cost command provides the metric for the summary default route generated by the ABR into the stub area. To further reduce the number of link-state advertisements (LSAs) sent into a stub area, you can configure the no-summary keyword on the ABR to prevent it from sending Summary LSAs (Type 3 LSAs3) into the stub area. This command requires the LAN Base Services license. Examples This example shows how to create stub area 33 in OSPF 209: switch# configure terminal switch(config)# router ospf 201 switch(config-router)# area 33 stub switch(config-router)# Related Commands area-id Identifier for the OSPF stub area. The area ID can be from 0 to 4294967295 or an IP address. no-summary (Optional) Prevents an Area Border Router (ABR) from sending summary link advertisements into the stub area. Release Modification 5.0(3)A1(1) This command was introduced. Command Description area default-cost Specifies a cost for the default summary route sent into a stub area.

OL-27852-01 Chapter Unicast Routing Commands area stub (OSPF) copy running-config startup-config Saves the configuration changes to the startup configuration file. show ip ospf Displays OSPF information. Command Description

OL-27852-01 Chapter Unicast Routing Commands area virtual-link (OSPF) area virtual-link (OSPF) To define an Open Shortest Path First (OSPF) virtual link, use the area virtual-link command. To remove a virtual link, use the no form of this command. area area-id virtual-link router-id no area area-id virtual-link router-id Syntax Description Command Default None Command Modes Router configuration mode Command History Usage Guidelines Use the area virtual-link command to establish a virtual link from a remote area to the backbone area. In OSPF, all areas must be connected to a backbone area. If the connection to the backbone is lost, it can be repaired by establishing a virtual link. Use the area virtual-link command to enter the virtual link configuration mode where you can use the following commands: • authentication [key-chain | message-digest | null] • authentication-key [0 | 3] key • dead-interval seconds • hello-interval seconds • message-digest-key key-id md5 key • retransmit-interval seconds • transmit-delay seconds See each command for syntax and usage details. You must configure both sides of a virtual link with the same area ID and the corresponding virtual link neighbor router ID. To see the router ID, use the show ip ospf neighbors command in any mode. Note You cannot configure a virtual link on a not-so-stubby (NSSA) area. area-id Identifier for the OSPF area assigned to the transit area for the virtual link. The area ID can be from 0 to 4294967295 or an IP address. router-id Router ID associated with the virtual link neighbor. Specify as an IP address. The router ID appears in the show ip ospf neighbors display. Release Modification 5.0(3)A1(1) This command was introduced.

OL-27852-01 Chapter Unicast Routing Commands area virtual-link (OSPF) This command requires the LAN Base Services license. Examples This example shows how to establish a virtual link between two devices, A, and B, with default values for all optional parameters: Device A: switch# configure terminal switch(config)# router ospf 1 switch(config-router)# router-id 192.0.2.2 switch(config-router)# area 1 virtual-link 192.0.2.1 switch(config-router-vlink)# Device B: switch# configure terminal switch(config# router ospf 209 switch(config-router)# router-id 192.0.2.1 switch(config-router)# area 1 virtual-link 192.0.2.2 switch(config-router-vlink)# Related Commands Command Description authentication (OSPF virtual link) Enables authentication for an OSPF virtual link. authentication-key (OSPF virtual link) Assigns a password to be used by neighboring routers that are using the simple password authentication of OSPF. copy running-config startup-config Saves the configuration changes to the startup configuration file. dead-interval (OSPF virtual link) Configures the dead interval for an OSPF virtual link. hello-interval (OSPF virtual link) Configures the hello interval for an OSPF virtual link. message-digest-key (virtual link) Enables OSPF MD5 authentication in an OSPF virtual link. retransmit-interval (OSPF virtual link) Configures the retransmit interval for an OSPF virtual link. show ip ospf neighbors Displays OSPF neighbor information. show ip ospf virtual-link Displays OSPF virtual link information. transmit-delay (OSPF virtual link) Configures the transmit delay for an OSPF virtual link.

OL-27852-01 Chapter Unicast Routing Commands authentication (HSRP) authentication (HSRP) To configure authentication for the Hot Standby Router Protocol (HSRP), use the authentication command. To disable authentication, use the no form of this command. authentication {string | md5 {key-chain key-chain | key-string {0 | 7} text [timeout seconds]} | text string} no authentication {string | md5 {key-chain key-chain | key-string {0 | 7} text [timeout seconds]} | text string} Syntax Description Command Default Disabled Command Modes HSRP configuration or HSRP template mode Command History Usage Guidelines Use the authentication text command to prevent misconfigured routers from participating in HSRP groups that they are not intended to participate in. The authentication string is sent unencrypted in all HSRP messages. The same authentication string must be configured on all routers in the same group to ensure interoperation. HSRP protocol packets that do not authenticate are ignored. Caution If you configure two routers with identical HSRP IP addresses but with different authentication strings, then neither router is aware of the duplication. This command does not require a license. md5 Specifies the Message Digest 5 (MD5) authentication. key-chain key-chain Identifies a group of authentication keys. key-string Specifies the secret key for MD5 authentication. 0 Specifies a clear text string. 7 Specifies an encrypted string. text Secret key for MD5 authentication. The range is from 1 to 255 characters. We recommend that you use at least 16 characters. timeout seconds (Optional) Specifies the authentication timeout value. The range is from 0 to 32767. text string Specifies an authentication string. The range is from 1 to 255 characters. The default string is “cisco”. Release Modification 5.0(3)A1(1) This command was introduced.

OL-27852-01 Chapter Unicast Routing Commands authentication (HSRP) Examples This example shows how to configure an authentication string for HSRP group 2: switch# configure terminal switch(config)# interface ethernet 0/1 switch(config-if)# no switchport switch(config-if)# ip address 10.0.0.1 255.255.255.0 switch(config-if)# hsrp 2 switch(config-if-hsrp)# priority 110 switch(config-if-hsrp)# preempt switch(config-if-hsrp)# authentication text sanjose switch(config-if-hsrp)# ip 10.0.0.3 switch(config-if-hsrp)# end switch(config-if-hsrp)# Related Commands Command Description feature hsrp Enables HSRP and enters HSRP configuration mode. hsrp group Creates an HSRP group.

OL-27852-01 Chapter Unicast Routing Commands authentication (OSPF virtual link) authentication (OSPF virtual link) To specify the authentication type for an Open Shortest Path First (OSPF) virtual link, use the authentication command. To remove the authentication type for a virtual link, use the no form of this command. authentication [key-chain key-name | message-digest | null] no authentication Syntax Description Command Default Defaults to password authentication if you configure authentication with none of the optional keywords. Command Modes OSPF virtual link configuration mode Command History Usage Guidelines Use the authentication command in virtual link configuration mode to configure the authentication method used on the virtual link. Use the message-digest keyword to configure MD5 message digest authentication and use the message-digest-key command to complete this authentication configuration. Use the key-chain keyword to configure password authentication using key chains and use the key chain command to complete this authentication configuration. Use the authentication command with no keywords to configure a password for the virtual link, and use the authentication-key command to complete this authentication configuration. This command requires the LAN Base Services license. Examples This example shows how to enable message-digest authentication: switch# configure terminal switch(config)# router ospf 22 switch(config-router)# area 99 virtual-link 192.0.2.12 switch(config-router-vlink)# authentication message-digest switch(config-router-vlink)# message-digest key 4 md5 0 abcd key-chain key-name (Optional) Specifies the key-chain to use. The key-name argument can be any alphanumeric string up to 63 characters. message-digest (Optional) Specifies to use message-digest authentication. null (Optional) Specifies no authentication is used. Disables authentication if configured for an area. Release Modification 5.0(3)A1(1) This command was introduced.

OL-27852-01 Chapter Unicast Routing Commands authentication (OSPF virtual link) Related Commands Command Description area authentication Enables authentication for an OSPF area. authentication-key (OSPF virtual link) Assigns a password to be used by neighboring routers that are using the password authentication of OSPF. key chain Creates a key chain for managing authentication keys. message-digest-key (OSPF virtual link) Enables OSPF MD5 authentication.

OL-27852-01 Chapter Unicast Routing Commands authentication (VRRP) authentication (VRRP) To configure an authentication for the Virtual Router Redundancy Protocol (VRRP), use the authentication command. To disable authentication, use the no form of this command. authentication text password no authentication [text password] Syntax Description Command Default No authentication Command Modes VRRP configuration mode Command History Usage Guidelines This command does not require a license. Examples This example shows how to configure md5 authentication for VRRP: switch# configure terminal switch(config)# interface ethernet 2/1 switch(config-if)# no switchport switch(config-if)# vrrp 250 switch(config-if-vrrp)# authentication text mypwasswd switch(config-if-vrrp)# Related Commands text password Specifies to use a simple text password of up to eight alphanumeric characters. Release Modification 5.0(3)A1(1) This command was introduced. Command Description clear vrrp Clears all the software counters for the specified virtual router. show vrrp Displays VRRP configuration information. vrrp Configures a VRRP group.

OL-27852-01 Chapter Unicast Routing Commands authentication key-chain (EIGRP) authentication key-chain (EIGRP) To enable authentication for the Enhanced Interior Gateway Routing Protocol (EIGRP) packets and to specify the set of keys that can be used on an interface, use the authentication key-chain command. To prevent authentication, use the no form of this command. authentication key-chain name-of-chain no authentication key-chain name-of-chain Syntax Description Command Default No authentication is provided for EIGRP packets. Command Modes Router configuration mode Address family configuration mode Router VRF configuration mode Command History Usage Guidelines Set the authentication mode using the authentication mode command in VRF configuration mode. You must separately configure a key chain using the key-chain command to complete the authentication configuration for an interface. This command requires the LAN Base Services license. Examples This example shows how to configure the interface to accept and send any key that belongs to the key-chain trees: switch# configure terminal switch(config)# router eigrp 209 switch(config-router)# vrf red switch(config-router-vrf)# authentication key-chain trees switch(config-router-vrf)# Related Commands name-of-chain Group of keys that are valid. Release Modification 5.0(3)A1(1) This command was introduced. Command Description authentication mode (EIGRP) Sets the authentication mode for EIGRP in a VRF. ip authentication key-chain eigrp Enables authentication for EIGRP and specifies the set of keys that can be used on an interface.

OL-27852-01 Chapter Unicast Routing Commands authentication key-chain (EIGRP) key-chain Creates a set of keys that can be used by an authentication method. show ip eigrp Displays EIGRP information. Command Description

OL-27852-01 Chapter Unicast Routing Commands authentication mode (EIGRP) authentication mode (EIGRP) To specify the type of authentication used in the Enhanced Interior Gateway Routing Protocol (EIGRP) packets, use the authentication mode command. To remove authentication, use the no form of this command. authentication mode md5 no authentication mode md5 Syntax Description Command Default None Command Modes Router configuration mode Address family configuration mode VRF configuration mode Command History Usage Guidelines This command requires the LAN Base Services license. Examples This example shows how to configure the interface to use MD5 authentication: switch# configure terminal switch(config)# router eigrp 209 switch(config-router)# vrf red switch(config-router-vrf)# authentication mode md5 switch(config-router-vrf)# Related Commands md5 Specifies Message Digest 5 (MD5) authentication. Release Modification 5.0(3)A1(1) This command was introduced. Command Description authentication key-chain eigrp Enables authentication for EIGRP and specifies the set of keys that can be used on an interface. ip authentication mode eigrp Configures the authentication mode for EIGRP on an interface. key chain Creates a set of keys that can be used by an authentication method. show ip eigrp Displays EIGRP information.

OL-27852-01 Chapter Unicast Routing Commands authentication-key (OSPF virtual link) authentication-key (OSPF virtual link) To assign a password to be used by an Open Shortest Path First (OSPF) virtual link, use the authentication-key command. To remove a previously assigned OSPF password, use the no form of this command. authentication-key [0 | 3] password no authentication-key Syntax Description Command Default Unencrypted password Command Modes OSPF virtual link configuration mode Command History Usage Guidelines Use the authentication-key command to configure the password for password authentication on an OSPF virtual link. All devices on the same virtual link must have the same password to be able to exchange OSPF information. This command requires the LAN Base Services license. Examples This example shows how to enable the authentication key with the string yourpass: switch# configure terminal switch(config)# router ospf 22 switch(config-router)# area 99 virtual-link 192.0.2.12 switch(config-router-vlink)# authentication switch(config-router-vlink)# authentication-key yourpass switch(config-router-vlink)# Related Commands 0 (Optional) Specifies an unencrypted authentication key. 3 (Optional) Specifies a 3DES encrypted authentication key. password Any continuous string of characters that can be entered from the keyboard up to 8 bytes. Release Modification 5.0(3)A1(1) This command was introduced. Command Description authentication (virtual link) Enables authentication for an OSPF virtual link.

OL-27852-01 Chapter Unicast Routing Commands auto-cost (OSPF) auto-cost (OSPF) To control how Open Shortest Path First (OSPF) calculates default metrics for an interface, use the auto-cost command. To assign the default reference bandwidth of 40 Gb/s, use the no form of this command. auto-cost reference-bandwidth bandwidth [Gbps | Mbps] no auto-cost reference-bandwidth Syntax Description Command Default 40 Gb/s. The bandwidth defaults to Gb/s if you do not specify the Gpbs or Mbps keyword. Command Modes Router configuration mode Command History Usage Guidelines Use the auto-cost command to set the reference bandwidth used by the OSPF cost-metric calculation. The value set by the ip ospf cost command overrides the cost that results from the auto-cost command. This command requires the LAN Base Services license. Examples This example shows how to set the reference bandwidth for all local interfaces in an OSPF instance: switch# configure terminal switch(config)# router ospf 201 switch(config-router)# auto-cost reference-bandwidth 10 switch(config-router)# Related Commands reference-bandwidth bandwidth Sets the reference bandwidth used to calculate the default metrics for an interface. The range depends on whether you use the Gbps or MBps keywords. Gbps (Optional) Specifies the rate in Gbps (bandwidth). The range is from 1 to 4000; the default is 40. Mbps (Optional) Specifies the rate in Mbps (bandwidth). The range is from 1 to 4000000; the default is 40000. Release Modification 5.0(3)A1(1) This command was introduced. Command Description ip ospf cost Explicitly specifies the cost of sending a packet on an interface.

OL-27852-01 Chapter Unicast Routing Commands autonomous-system autonomous-system To configure the autonomous system (AS) number for an Enhanced Interior Gateway Routing Protocol (EIGRP) address family, use the autonomous-system command. To revert to default, use the no form of this command. autonomous-system as-number no autonomous-system [as-number] Syntax Description Command Default None Command Modes Address family configuration mode Command History Usage Guidelines Use the autonomous-system command to set a common AS number for all EIGRP instances in an address family. This command requires the LAN Base Services license. Examples This example shows how to set an AS number for EIGRP for IPv4 unicast: switch# configure terminal switch(config)# router eigrp 201 switch(config-router)# address-family ipv4 unicast switch(config-router-af)# autonomous-system 64496 switch(config-router-af)# Related Commands as-number Autonomous system number. The range is from 1 to 65535. Release Modification 5.0(3)A1(1) This command was introduced. Command Description address-family (EIGRP) Enters the address family configuration mode for EIGRP.

OL-27852-01 Chapter Unicast Routing Commands bestpath (BGP) bestpath (BGP) To change the default best-path selection algorithm, use the bestpath command. To return the Border Gateway Protocol (BGP) routing process to the default operation, use the no form of this command. bestpath {always-compare-med | compare-routerid | {med {missing-as-worst | non-deterministic}} no bestpath {always-compare-med | compare-routerid | {med {missing-as-worst | non-deterministic}} Syntax Description Command Default The default settings are as follows: med missing-as-worst: A value of 0 is assigned to the missing MED med non-deterministic: Disabled Command Modes Router BGP configuration mode Command History Usage Guidelines Before you use this command, ensure that BGP is enabled on the switch by using the feature bgp command. To enable the comparison of the MED for paths from neighbors in different autonomous systems, use the bgp always-compare-med command. This command requires the LAN Enterprise Services license. Examples This example shows how to change the default best-path selection algorithm to compare the MED on paths from different autonomous systems: switch# configure terminal switch(config)# router bgp 64496 switch(config-router)# bestpath always-compare-med always-compare-med Compares the Multi-Exit Discriminator (MED) on paths from a different autonomous system (AS). compare-routerid Configures a BGP routing process to compare identical routes received from different external peers during the best path selection process and to select the route with the lowest router ID as the best path. med missing-as-worst Assigns the value of infinity to received routes that do not carry the MED attribute, making these routes the least desirable. med non-deterministic Specifies that the best-MED path among paths is not picked from the same AS. Release Modification 5.0(3)A1(1) This command was introduced.

OL-27852-01 Chapter Unicast Routing Commands bestpath (BGP) switch(config-router)# Related Commands Command Description feature bgp Enables BGP globally. show ip bgp Displays information about BGP routes. show running-config bgp Displays the running configuration for BGP for IPv4 networks.

OL-27852-01 Chapter Unicast Routing Commands bestpath as-path multipath-relax (BGP) bestpath as-path multipath-relax (BGP) To configure a Border Gateway Protocol (BGP) routing process to consider the different autonomous system (AS) paths and load balance multiple paths during best path route selection, use the bestpath as-path multipath-relax command. To return the BGP routing process to the default operation, use the no form of this command. bestpath as-path multipath-relax no bestpath as-path multipath-relax Syntax Description This command has no arguments or keywords. Command Default None Command Modes Router BGP configuration mode VRF configuration mode Command History Usage Guidelines Before you use this command, ensure that BGP is enabled on the switch by using the feature bgp command. This command requires the LAN Enterprise Services license. Examples This example shows how to configure multipath load sharing on paths from different autonomous systems in router mode: switch# configure terminal switch(config)# router bgp 120 switch(config-router)# bestpath as-path multipath-relax switch(config-router)# Related Commands Release Modification 5.0(3)U1(2) This command was introduced. Command Description feature bgp Enables BGP globally. show ip bgp Displays information about BGP routes. show running-config bgp Displays the running configuration for BGP for IPv4 networks.

OL-27852-01 Chapter Unicast Routing Commands capability additional-paths receive capability additional-paths receive To configure the receive additional paths capability for the specified neighbor, use the capability additional-paths receive command in neighbor address family configuration mode or peer policy template configuration mode. To disable the capability of receiving additional paths, use the no form of this command. capability additional-paths receive [disable] no capability additional-paths receive [disable] Syntax Description Command Default Capability of receiving additional paths is disabled. Command Modes Neighbor address family configuration (config-router-af) VRF Neighbor address family configuration Neighbor VPN address family configuration Neighbor IPv6 labeled-unicast address-family configuration Peer policy template configuration (config-router-ptmp) Command History Usage Guidelines Use the capability additional-paths receive command to selectively enable or disable the additional paths receive capability negotiation for a particular neighbor. The ability to send and receive additional paths is negotiated between two BGP neighbors during session establishment. To advertise additional paths, you also need to: • Configure the additional-paths receive command in global address-family configuration mode. • Advertise the paths (other than best-path) by using the set path-selection command. Use the capability additional-paths receive disable command to override template or address family configurations that enable receiving additional paths. Use the show ip bgp neighbors command to display whether neighbors are capable of sending or receiving additional paths. Any changes to this command take effect only after the next session is established and does not cause the tear down of any currently established sessions. You must restart any currently established BGP sessions for the new configuration to take effect. Use the clear bgp command to restart sessions. disable (Optional) Overrides any address family configuration that enables receiving additional paths. Release Modification 6.0(2)A1(1) This command was introduced.

OL-27852-01 Chapter Unicast Routing Commands capability additional-paths receive Examples In the following example, additional paths can be sent and received for the specified neighbor: switch# configure terminal switch (config)# router bgp 65000 switch (config-router)# neighbor 2001:db8::1037 switch (config-router-neighbor)# address-family ipv6 unicast switch (config-router-neighbor-af)# capability additional-paths send switch (config-router-neighbor-af)# capability additional-paths receive In the following example, additional paths can be sent and received for the address family, but the specified neighbor is disabled from sending or receiving additional paths: switch# configure terminal switch (config)# router bgp 65000 switch (config-router)# address-family ipv6 unicast switch (config-router-af)# additional-paths send switch (config-router-af)# additional-paths receive switch (config-router-af)# additional-paths selection route-map add_path4 switch (config-router-af)# neighbor 2001:db8::1037 switch (config-router-neighbor)# address-family ipv6 unicast switch (config-router-neighbor-af)# capability additional-paths send disable switch (config-router-neighbor-af)# capability additional-paths receive disable In the following example, the send and receive capability of the neighbor overrides the receive-only capability of the address family: switch# configure terminal switch (config)# router bgp 65000 switch (config-router)# address-family ipv6 unicast switch (config-router-af)# additional-paths receive switch (config-router-af)# additional-paths selection route-map add_path4 switch (config-router-af)# neighbor 2001:db8::1037 switch (config-router-neighbor)# address-family ipv6 unicast switch (config-router-neighbor-af)# capability additional-paths send switch (config-router-neighbor-af)# capability additional-paths receive In the following example, additional paths can be sent and received by a neighbor using the specified template: switch# configure terminal switch (config)# router bgp 65000 switch (config-router)# template peer-policy rr-client-pt1 switch (config-router-ptmp)# capability additional-paths send switch (config-router-ptmp)# capability additional-paths receive Related Commands Command Description additional-paths receive Enables BGP additional paths for a prefix to be received from a capable peer. set path-selection all advertise Advertises all BGP paths as additional paths to peers if the receive capability is enabled. show ip bgp Displays information about BGP networks, including path selections and path IDs. show ip bgp neighbors Displays information about the TCP and BGP connections of neighbors.

OL-27852-01 Chapter Unicast Routing Commands capability additional-paths send capability additional-paths send To configure the send additional paths capability for the specified neighbor, use the capability additional-paths send command in neighbor address family configuration mode or peer policy template configuration mode. To disable the capability of sending additional paths, use the no form of the command. capability additional-paths send [disable] no capability additional-paths send [disable] Syntax Description Command Default Capability of sending additional paths is disabled. Command Modes Neighbor address family configuration (config-router-af) VRF Neighbor address family configuration Neighbor VPN address family configuration Neighbor IPv6 labeled-unicast address-family configuration Peer policy template configuration (config-router-ptmp) Command History Usage Guidelines Use the capability additional-paths send command to selectively enable or disable the additional paths send capability negotiation for a particular neighbor. The ability to send and receive additional paths is negotiated between two BGP neighbors during session establishment. To advertise additional-paths, you also need to: • Configure the additional-path send command in global address-family configuration mode. • Advertise the paths (other than best-path) by using the set path-selection command. Use the capability additional-paths send disable command to override template or address family configurations that enable the sending of additional paths. Use the show ip bgp neighbors command to display whether neighbors are capable of sending or receiving additional paths. Any changes to this command take effect only after the next session is established and do not cause any currently established sessions to be torn down. You must restart any currently established BGP sessions for the new configuration to take effect. Use the clear bgp command to restart sessions. disable (Optional) Overrides any address family configuration that enables sending additional paths. Release Modification 6.0(2)A1(1) This command was introduced.

OL-27852-01 Chapter Unicast Routing Commands capability additional-paths send Examples In the following example, additional paths can be sent and received by the specified neighbor: switch# configure terminal switch (config)# router bgp 65000 switch (config-router)# neighbor 2001:db8::1037 switch (config-router-neighbor)# address-family ipv6 unicast switch (config-router-neighbor-af)# capability additional-paths send switch (config-router-neighbor-af)# capability additional-paths receive In the following example, additional paths can be sent and received for the address family, but the specified neighbor is disabled from sending or receiving additional paths: switch# configure terminal switch (config)# router bgp 65000 switch (config-router)# address-family ipv6 unicast switch (config-router-af)# additional-paths send switch (config-router-af)# additional-paths receive switch (config-router-af)# additional-paths selection route-map add_path4 switch (config-router-af)# neighbor 2001:db8::1037 switch (config-router-neighbor)# address-family ipv6 unicast switch (config-router-neighbor-af)# capability additional-paths send disable switch (config-router-neighbor-af)# capability additional-paths receive disable In the following example, the send and receive capability of the neighbor overrides the send-only capability of the address family: switch# configure terminal switch (config)# router bgp 65000 switch (config-router)# address-family ipv6 unicast switch (config-router-af)# additional-paths send switch (config-router-af)# additional-paths selection route-map add_path4 switch (config-router-af)# neighbor 2001:db8::1037 switch (config-router-neighbor)# address-family ipv6 unicast switch (config-router-neighbor-af)# capability additional-paths send switch (config-router-neighbor-af)# capability additional-paths receive In the following example, additional paths can be sent and received by a neighbor using the specified template: switch# configure terminal switch (config)# router bgp 65000 switch (config-router)# template peer-policy rr-client-pt1 switch (config-router-ptmp)# capability additional-paths send switch (config-router-ptmp)# capability additional-paths receive Related Commands Command Description additional-paths send Enables BGP additional paths for a prefix to be sent to a capable peer. set path-selection all advertise Advertises all BGP paths as additional paths to peers if the receive capability is enabled. show ip bgp Displays information about BGP neighbors, including path selections and path IDs. show ip bgp neighbors Displays information about the TCP and BGP connections to neighbors.

OL-27852-01 Chapter Unicast Routing Commands clear bgp clear bgp To clear Border Gateway Protocol (BGP) routes from the BGP table, use the clear bgp command. clear bgp {ipv4 {multicast | unicast} | all} {neighbor | * | as-number | peer-template name | prefix} [vrf vrf-name] Syntax Description Command Default None Command Modes Any command mode Command History Usage Guidelines This command requires the LAN Enterprise Services license. Examples This example shows how to clear all BGP entries: switch# clear bgp all * Related Commands ipv4 Clears the BGP information for the IPv4 address family. multicast Clears BGP information for the multicast address family. unicast Clears BGP information for the unicast address family. all Clears the BGP information for all address families. neighbor Network address. The format is A.B.C.D for IPv4. * Clears all neighbors. as-number Autonomous system number. The range is from 1 to 65535. peer-template name Specifies a BGP peer template. The name can be any case-sensitive, alphanumeric string up to 63 characters. prefix Prefix from the selected address family. The format is A.B.C.D/length for IPv4. vrf vrf-name (Optional) Specifies a particular virtual routing and forwarding (VRF) context name or all VRF instances. The VRF name can be any case-sensitive, alphanumeric string up to 32 characters. Release Modification 5.0(3)A1(1) This command was introduced. Command Description show bgp Displays BGP routes.

OL-27852-01 Chapter Unicast Routing Commands clear bgp dampening clear bgp dampening To clear Border Gateway Protocol (BGP) route flap dampening information, use the clear bgp dampening command. clear bgp {ipv4 {unicast | multicast} | all} dampening [neighbor | prefix] [vrf vrf-name | all | default | management] Syntax Description Command Default None Command Modes Any command mode Command History Usage Guidelines This command requires the LAN Enterprise Services license. Examples This example shows how to clear BGP route flap dampening information: switch# clear bgp all dampening ipv4 Clears BGP information for the IPv4 address family. unicast Clears BGP information for the unicast address family. multicast Clears BGP information for the multicast address family. all Clears BGP information for all address families. neighbor (Optional) Neighbor from the selected address family. The format is A.B.C.D for IPv4. prefix (Optional) Prefix from the selected address family. The format is A.B.C.D/length for IPv4. vrf vrf-name (Optional) Specifies a particular virtual routing and forwarding (VRF) instance. The VRF name can be any case-sensitive, alphanumeric string up to 32 characters. all (Optional) Clears BGP information from all VRFs. default (Optional) Clears BGP information from the default VRF. management (Optional) Clears BGP information from the management VRF. Release Modification 5.0(3)A1(1) This command was introduced.

OL-27852-01 Chapter Unicast Routing Commands clear bgp dampening Related Commands Command Description show ip bgp dampening Displays BGP dampening information.

OL-27852-01 Chapter Unicast Routing Commands clear bgp flap-statistics clear bgp flap-statistics To clear Border Gateway Protocol (BGP) route flap statistics, use the clear bgp flap-statistics command. clear bgp {ipv4 {multicast | unicast} | all} flap-statistics [neighbor | prefix] [vrf vrf-name | all | default | management] Syntax Description Command Default None Command Modes Any command mode Command History Usage Guidelines This command requires the LAN Enterprise Services license. Examples This example shows how to clear BGP route flap statistics: switch# clear bgp ipv4 multicast flap-statistics ipv4 Clears BGP information for the IPv4 address family. unicast Clears BGP information for the unicast address family. multicast Clears BGP information for the multicast address family. all Clears BGP information for all address families. neighbor (Optional) Neighbor from the selected address family. The format is A.B.C.D for IPv4. prefix (Optional) Prefix from the selected address family. The format is A.B.C.D/length for IPv4. vrf vrf-name (Optional) Specifies a particular virtual routing and forwarding (VRF) instance. The VRF name can be any case-sensitive, alphanumeric string up to 32 characters. all (Optional) Clears BGP information from all VRFs. default (Optional) Clears BGP information from the default VRF. management (Optional) Clears BGP information from the management VRF. Release Modification 5.0(3)A1(1) This command was introduced.

OL-27852-01 Chapter Unicast Routing Commands clear bgp flap-statistics Related Commands Command Description show ip bgp flap-statistics Displays BGP flap statistics.

OL-27852-01 Chapter Unicast Routing Commands clear bgp policy statistics aggregate-address clear bgp policy statistics aggregate-address To clear policy statistics for the Border Gateway Protocol (BGP) topology table, use the clear bgp policy statistics aggregate-address command. clear bgp policy statistics aggregate-address prefix {advertise-map | suppress-map} Syntax Description Command Default None Command Modes Any command mode Command History Usage Guidelines This command requires the LAN Enterprise Services license. Examples This example shows how to clear policy statistics for an aggregate address: switch# clear bgp policy statistics aggregate-address 192.0.2.0/8 Related Commands prefix Summary address. The format is x.x.x.x or x.x.x.x/length. The range is from 1 to 32. advertise-map Clears policy statistics for the advertise policy. suppress-map Clears policy statistics for the suppress policy. Release Modification 5.0(3)A1(1) This command was introduced. Command Description show bgp policy statistics Displays BGP policy statistics.

OL-27852-01 Chapter Unicast Routing Commands clear bgp policy statistics dampening clear bgp policy statistics dampening To clear policy statistics for the Border Gateway Protocol (BGP) dampening, use the clear bgp policy statistics dampening command. clear bgp policy statistics dampening Syntax Description This command has no arguments or keywords. Command Default None Command Modes Any command mode Command History Usage Guidelines This command requires the LAN Enterprise Services license. Examples This example shows how to clear policy statistics for dampening: switch# clear bgp policy statistics dampening Related Commands Release Modification 5.0(3)A1(1) This command was introduced. Command Description show bgp policy statistics Displays BGP policy statistics.

OL-27852-01 Chapter Unicast Routing Commands clear bgp policy statistics neighbor clear bgp policy statistics neighbor To clear policy statistics for the Border Gateway Protocol (BGP) neighbor, use the clear bgp policy statistics neighbor command. clear bgp policy statistics neighbor prefix [default-originate | {filter-list | prefix-list | route-map} {in | out}] Syntax Description Command Default None Command Modes Any command mode Command History Usage Guidelines This command requires the LAN Enterprise Services license. Examples This example shows how to clear policy statistics for an aggregate address: switch# clear bgp policy statistics neighbor 192.0.2.1 filter-list in Related Commands prefix Neighbor address. The format is x.x.x.x. default-originate (Optional) Clears policy statistics for the default originate policy. filter-list Clears policy statistics for the neighbor filter list. prefix-list Clears policy statistics for the neighbor prefix list. route-map Clears policy statistics for the neighbor route map. in (Optional) Clears inboud policy statistics. out (Optional) Clears outbound policy statistics. Release Modification 5.0(3)A1(1) This command was introduced. Command Description show bgp policy statistics Displays BGP policy statistics.

OL-27852-01 Chapter Unicast Routing Commands clear bgp policy statistics redistribute clear bgp policy statistics redistribute To clear policy statistics for the Border Gateway Protocol (BGP) topology table, use the clear bgp policy statistics redistribute command. clear bgp policy statistics redistribute {direct | eigrp id | ospf id | rip id | static} [vrf {vrf-name | all | default | management}] Syntax Description Command Default None Command Modes Any command mode Command History Usage Guidelines This command requires the LAN Enterprise Services license. Examples This example shows how to clear policy statistics for RIP: switch# clear bgp policy statistics redistribute rip 201 direct Clears policy statistics for directly connected routes only. eigrp Clears policy statistics for Enhanced Interior Gateway Routing Protocol (EIGRP). ospf Clears policy statistics for the Open Shortest Path First (OSPF) protocol. rip Clears policy statistics for the Routing Information Protocol (RIP). static Clears policy statistics for IP static routes. id For the eigrp keyword, an EIGRP instance name from which routes are to be redistributed. The value takes the form of a string. You can enter a decimal number, but Cisco NX-OS stores it internally as a string. For the ospf keyword, an OSPF instance name from which routes are to be redistributed. The value takes the form of a string. You can enter a decimal number, but Cisco NX-OS stores it internally as a string. vrf vrf-name Specifies a particular virtual routing and forwarding (VRF) instance. The VRF name is an alphanumeric string of up to 32 characters. all (Optional) Specifies the “all” VRF instance. default (Optional) Specifies the default VRF. management (Optional) Specifies the management VRF. Release Modification 5.0(3)A1(1) This command was introduced.

OL-27852-01 Chapter Unicast Routing Commands clear bgp policy statistics redistribute Related Commands Command Description show bgp policy statistics Displays BGP policy statistics.

OL-27852-01 Chapter Unicast Routing Commands clear forwarding route clear forwarding route To clear forwarding information, use the clear forwarding route command. clear forwarding {ip | ipv4} route [* | prefix] [vrf vrf-name] Syntax Description Command Default None Command Modes Any command mode Command History Usage Guidelines This command does not require a license. We recommend that you use the clear ip route command after using the clear forwarding route command. Examples This example shows how to clears a route from the FIB: switch# clear forwarding ip route 10.0.0.1/8 Related Commands ip Clears an IPv4 route. ipv4 Clears an IPv4 route. * (Optional) Clears all routes. prefix (Optional) IPv4 prefix. The IPv4 format is x.x.x.x/length. vrf vrf-name (Optional) Specifies a particular virtual routing and forwarding (VRF) instance. The VRF name can be any case-sensitive, alphanumeric string up to 32 characters. Release Modification 5.0(3)A1(1) This command was introduced. Command Description clear ip route Clears individual routes from the unicast RIB. show forwarding Displays the forwarding information.

OL-27852-01 Chapter Unicast Routing Commands clear forwarding inconsistency clear forwarding inconsistency To clear the Layer 3 inconsistency checker for the Forwarding Information Base (FIB), use the clear forwarding inconsistency command. clear forwarding inconsistency Syntax Description This command has no arguments or keywords. Command Default None Command Modes Any command mode Command History Usage Guidelines This command does not require a license. Examples This example shows how to clear the Layer 3 inconsistency checker for all modules: switch# clear forwarding inconsistency module all Related Commands Release Modification 5.0(3)A1(1) This command was introduced. Command Description show forwarding inconsistency Displays information about the FIB inconsistencies. test forwarding inconsistency Triggers the forwarding inconsistency checker.

OL-27852-01 Chapter Unicast Routing Commands clear ip adjacency statistics clear ip adjacency statistics To clear adjacency statistics, use the clear ip adjacency statistics command. clear ip adjacency statistics Syntax Description This command has no arguments or keywords. Command Default None Command Modes Any command mode Command History Usage Guidelines This command does not require a license. Examples This example shows how to clear the adjacency statistics: switch# clear ip adjacency statistics Related Commands Release Modification 5.0(3)A1(1) This command was introduced. Command Description show ip adjacency Displays adjacency information.

OL-27852-01 Chapter Unicast Routing Commands clear ip arp clear ip arp To clear the Address Resolution Protocol (ARP) information, use the clear ip arp command. clear ip arp [ip-addr | ethernet slot/port[.sub_if] | loopback if_number | port-channel number[.sub_if_number]] [force-delete | statistics] [vrf vrf-name | all | default | management] Syntax Description Command Default None Command Modes Any command mode Command History Usage Guidelines This command does not require a license. Examples This example shows how to clear the ARP table: switch# clear ip arp ip-addr (Optional) IPv4 source address. The format is x.x.x.x. ethernet slot/port (Optional) Specifies the Ethernet interface and the slot number and port number. The slot number is from 1 to 255, and the port number is from 1 to 128. sub_if (Optional) Specifies the Ethernet subinterface port number. The range is from 1 to 48. loopback if_number (Optional) Specifies the loopback interface. The loopback interface number is from 0 to 1023. port-channel number (Optional) Specifies the EtherChannel interface and EtherChannel number. The range is from 1 to 4096. sub_if-number (Optional) Subinterface number. The range is from 1 to 4093. force-delete (Optional) Clears the entries from the ARP table without a refresh. statistics (Optional) Clears ARP statistics. vrf vrf-name (Optional) Specifies the virtual routing and forwarding (VRF) context name. The name can be any case-sensitive, alphanumeric string up to 32 characters. all (Optional) Clears the ARP information from all VRF entries. default (Optional) Clears the ARP information from the default VRF. management (Optional) Clears the ARP information from the management VRF. Release Modification 5.0(3)A1(1) This command was introduced.

OL-27852-01 Chapter Unicast Routing Commands clear ip arp Related Commands Command Description show ip arp Displays information about ARP.

OL-27852-01 Chapter Unicast Routing Commands clear ip bgp clear ip bgp To clear Border Gateway Protocol (BGP) routes from the BGP table, use the clear ip bgp command. clear ip bgp {ipv4 {unicast | multicast} | all} {neighbor | * | as-number | peer-template name | prefix} [vrf vrf-name | all | default | management] Syntax Description Command Default None Command Modes Any command mode Command History Usage Guidelines This command requires the LAN Enterprise Services license. Examples This example shows how to clear all BGP entries for the IPv4 address family: switch# clear ip bgp * ipv4 (Optional) Clears BGP information for the IPv4 address family. unicast Clears BGP information for the unicast address family. multicast Clears BGP information for the multicast address family. all Clears the BGP information for all address families. neighbor Network address. The format is A.B.C.D for IPv4. * Clears all BGP routes. as-number Autonomous system (AS) number. The range is from 1 to 65535. peer-template name Specifies a BGP peer template. The name can be any case-sensitive, alphanumeric string up to 63 characters. prefix Prefix from the selected address family. The format is A.B.C.D/length for IPv4. vrf vrf-name (Optional) Specifies a particular VPN routing and forwarding (VRF) instance. The VRF name can be any case-sensitive, alphanumeric string up to 32 characters. all (Optional) Clears the BGP information from all VRF entries. default (Optional) Clears the BGP information from the default VRF. management (Optional) Clears the BGP information from the management VRF. Release Modification 5.0(3)A1(1) This command was introduced.

OL-27852-01 Chapter Unicast Routing Commands clear ip bgp Related Commands Command Description show ip bgp Displays entries in the BGP table.

OL-27852-01 Chapter Unicast Routing Commands clear ip bgp dampening clear ip bgp dampening To clear Border Gateway Protocol (BGP) route flap dampening information, use the clear ip bgp dampening command. clear ip bgp [ipv4 {unicast | multicast} | all] dampening [neighbor | prefix] [vrf vrf-name | all | default | management] Syntax Description Command Default None Command Modes Any command mode Command History Usage Guidelines This command requires the LAN Enterprise Services license. Examples This example shows how to clear BGP route flap dampening information: switch# clear ip bgp dampening ipv4 (Optional) Clears BGP information for the IPv4 address family. unicast (Optional) Clears BGP information for the unicast address family. multicast (Optional) Clears BGP information for the multicast address family. all (Optional) Clears the BGP information for all address families. neighbor (Optional) Neighbor from the selected address family. The format is A.B.C.D for IPv4. prefix (Optional) Prefix from the selected address family. The format is A.B.C.D/length for IPv4. vrf vrf-name (Optional) Specifies a particular virtual routing and forwarding (VRF) instance. The VRF name can be any case-sensitive, alphanumeric string up to 32 characters. all (Optional) Clears the BGP information from all VRF entries. default (Optional) Clears the BGP information from the default VRF. management (Optional) Clears the BGP information from the management VRF. Release Modification 5.0(3)A1(1) This command was introduced.

OL-27852-01 Chapter Unicast Routing Commands clear ip bgp dampening Related Commands Command Description show ip bgp dampening Displays BGP dampening information.

OL-27852-01 Chapter Unicast Routing Commands clear ip bgp flap-statistics clear ip bgp flap-statistics To clear Border Gateway Protocol (BGP) route flap statistics, use the clear ip bgp flap-statistics command. clear ip bgp flap-statistics [neighbor | prefix] [vrf vrf-name | all | default | management] Syntax Description Command Default None Command Modes Any command mode Command History Usage Guidelines This command requires the LAN Enterprise Services license. Examples This example shows how to clear BGP route flap statistics: switch# clear ip bgp flap-statistics Related Commands neighbor (Optional) Neighbor from the selected address family. The format is A.B.C.D for IPv4. prefix (Optional) Prefix from the selected address family. The format is A.B.C.D/length for IPv4. vrf vrf-name (Optional) Specifies a particular virtual routing and forwarding (VRF) instance. The VRF name can be any case-sensitive, alphanumeric string up to 32 characters. all (Optional) Clears the BGP information from all VRF entries. default (Optional) Clears the BGP information from the default VRF. management (Optional) Clears the BGP information from the management VRF. Release Modification 5.0(3)A1(1) This command was introduced. Command Description show ip bgp flap-statistics Displays BGP flap statistics.

OL-27852-01 Chapter Unicast Routing Commands clear ip eigrp accounting clear ip eigrp accounting To clear the prefix accounting information for the Enhanced Interior Gateway Routing Protocol (EIGRP) processes, use the clear ip eigrp accounting command. clear ip eigrp accounting [vrf {vrf-name | all | default | management}] Syntax Description Command Default None Command Modes Any command mode Command History Usage Guidelines This command requires the LAN Base Services license. Examples This example shows how to clear the EIGRP accounting information: switch# clear ip eigrp accounting Related Commands vrf vrf-name (Optional) Specifies the name of the virtual routing and forwarding (VRF) instance. The vrf-name argument can be specified as any case-sensitive, alphanumeric string up to 32 characters. The strings “default” and “all” are reserved VRF names. all (Optional) Clears the EIGRP accounting information from all VRF instances. default (Optional) Clears the EIGRP accounting information from the default VRF. management (Optional) Clears the EIGRP accounting information from the management VRF. Release Modification 5.0(3)A1(1) This command was introduced. Command Description show ip eigrp accounting Displays prefix accounting information for the EIGRP processes.

OL-27852-01 Chapter Unicast Routing Commands clear ip eigrp neighbors clear ip eigrp neighbors To remove and reestablish the Enhanced Interior Gateway Routing Protocol (EIGRP) neighbor entries from the appropriate table, use the clear ip eigrp neighbors command. clear ip eigrp neighbors [* | ip-address | ethernet slot/port | loopback if_number | port-channel number] [soft] [vrf {vrf-name | all | default | management}] Syntax Description Command Default When no autonomous system number, interface, or VRF instance is specified, all EIGRP neighbor entries are cleared from the table. Command Modes Any command mode Command History Usage Guidelines This command requires the LAN Base Services license. Examples This example shows how to clear all EIGRP entries for neighbors on Ethernet interface 2/1: switch# clear ip eigrp neighbors ethernet 2/1 vrf * * (Optional) Clears all neighbors. ip-address (Optional) Address of the neighbor. ethernet slot/port (Optional) Clears the Ethernet interface from the neighbor table. The slot number is from 1 to 255, and the port number is from 1 to 128. loopback if_number (Optional) Clears the loopback interface from the neighbor table. The loopback interface number is from 0 to 1023. port-channel number (Optional) Clears the EtherChannel interface and EtherChannel number from the neighbor table. The range is from 1 to 4096. soft (Optional) Specifies soft reset for the neighbors. vrf vrf-name (Optional) Specifies a virtual routing and forwarding (VRF) instance. The VRF name is an alphanumeric string of up to 32 characters. all (Optional) Clears the EIGRP neighbor information from all VRF instances. default (Optional) Clears the EIGRP neighbor information from the default VRF. management (Optional) Clears the EIGRP neighbor information from the management VRF. Release Modification 5.0(3)A1(1) This command was introduced.

OL-27852-01 Chapter Unicast Routing Commands clear ip eigrp neighbors Related Commands Command Description show ip eigrp interfaces Displays information about interfaces configured for EIGRP. show ip eigrp neighbors Displays the neighbors discovered by EIGRP.

OL-27852-01 Chapter Unicast Routing Commands clear ip eigrp redistribution clear ip eigrp redistribution To clear redistribution information for the Enhanced Interior Gateway Routing Protocol (EIGRP), use the clear ip eigrp redistribution command. clear ip eigrp redistribution [vrf {vrf-name | all | default | management}] Syntax Description Command Default None Command Modes Any command mode Command History Usage Guidelines This command requires the LAN Base Services license. Examples This example shows how to clear redistribution information: switch# clear ip eigrp redistribution Related Commands vrf vrf-name (Optional) Specifies a particular virtual routing and forwarding (VRF) instance. The VRF name is a case-sensitive, alphanumeric string of up to 32 characters. all (Optional) Clears the redistribution information from all VRF instances. default (Optional) Clears the redistribution information from the default VRF. management (Optional) Clears the redistribution information from the management VRF. Release Modification 5.0(3)A1(1) This command was introduced. Command Description feature eigrp Enables the EIGRP feature.

OL-27852-01 Chapter Unicast Routing Commands clear ip eigrp traffic clear ip eigrp traffic To clear the Enhanced Interior Gateway Routing Protocol (EIGRP) traffic statistics, use the clear ip eigrp traffic command. clear ip eigrp traffic [vrf {vrf-name | all | default | management}] Syntax Description Command Default This command clears information for the default VRF if no VRF is specified. Command Modes Any command mode Command History Usage Guidelines This command requires the LAN Base Services license. Examples This example shows how to clear the EIGRP traffic statistics: switch# clear ip eigrp traffic Related Commands vrf vrf-name (Optional) Specifies the name of the virtual routing and forwarding (VRF) instance. The vrf-name argument can be specified as any case-sensitive, alphanumeric string up to 32 characters. all (Optional) Clears the traffic statistics from all VRF instances. default (Optional) Clears the traffic statistics from the default VRF. management (Optional) Clears the traffic statistics from the management VRF. Release Modification 5.0(3)A1(1) This command was introduced. Command Description show ip eigrp traffic Displays the number of EIGRP packets sent and received.