Huawei S Series White Paper

iStack Technology White Paper Issue 01 Date 2013-05-25 HUAWEI TECHNOLOGIES CO., LTD. ...

Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. i Copyright © Huawei Technologies Co., Ltd. 2013. All rights reserved. No part of this document may be reproduced or transmitted in any form or by any means without prior written consent of Huawei Technologies Co., Ltd. Trademarks and Permissions and other Huawei trademarks are trademarks of Huawei Technologies Co., Ltd. All other trademarks and trade nam ...

iStack Technology White Paper Contents Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. ii Contents 1 Feature Introduction ..................................................................................................................... 1 1.1 iStack Overview ............................................................................................................................... ...

iStack Technology White Paper Contents Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. iii 2.12.3 Multicast Packet Forwarding ................................................................................................................................. 33 2.12.4 Eth-Trunk Preferentially Forwarding Local Traffic ......................................................................... ...

iStack Technology White Paper 1 Feature Introduction Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 1 1 Feature Introduction 1.1 iStack Overview Currently, two models of Huawei switches are available on the network: box switches and chassis switches.  Box switches have low costs but lack uninterrupted service protection, and cannot apply to the scenarios that require high availabili ...

iStack Technology White Paper 1 Feature Introduction Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 2 In Figure 1-2, iStack virtualizes multiple devices at the same network layer into one logical device without changing the existing network physical topology. This technology simplifies network structure, facilitates network protocol deployment, and improves network reliability and mana ...

iStack Technology White Paper 1 Feature Introduction Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 3 Stack Priority The stack priority is an attribute of a member device and determines the role of the member device during role election. A larger value indicates a higher priority and higher probability that the member device competes to be the master device. Physical Member Port A phys ...

iStack Technology White Paper 1 Feature Introduction Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 4 Figure 1-3 Data forwarding before the master switch fails VRRP master device Master Standby Slave Slave Network Network Eth-Trunk iStack link Service flow ...

iStack Technology White Paper 1 Feature Introduction Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 5 Figure 1-4 Data forwarding after the master switch fails VRRP master device Original master New master Slave Standby Network Network VRRP backup device Eth-Trunk iStack link Service flow 1.3.3 Uplink and Downlink Redundancy iStack can implement redundancy of uplinks and downlinks throu ...

iStack Technology White Paper 1 Feature Introduction Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 6 Figure 1-5 Data forwarding before a link fails Slave Slave Master Standby Eth-Trunk iStack link Service flow Network Figure 1-6 Data forwarding after a link fails Slave Slave Master Standby Eth-Trunk iStack link Service flow Network ...

iStack Technology White Paper 1 Feature Introduction Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 7 1.3.4 Redundancy of Stack Links and Stack Ports Redundancy of Stack Links in a Ring Topology iStack can implement redundancy of stack links in a ring topology. When a link fails, the ring topology changes into a chain topology so that services in the stack are not affected. Redundancy ...

iStack Technology White Paper 1 Feature Introduction Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 8 Figure 1-8 Long-distance stacking Building B Third floor Second floor First floor Eth-Trunk iStack Buidling A Third floor Second floor First floor iStack Eth-Trunk Network 1.3.6 Simplified Networking As shown in Figure 1-9, multiple devices at the aggregation layer are virtualized into ...

iStack Technology White Paper 1 Feature Introduction Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 9 Figure 1-9 Simplified networking MSTP +VRRP iStack Aggregation Access ...

iStack Technology White Paper 2 Technology Description Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 10 2 Technology Description 2.1 Stack Physical Connection As shown in Figure 2-1, switches in a stack can be connected in a chain or ring topology. Table 2-1 compares the two topologies. A stack usually uses a ring topology. In the ring topology, member switches are connected to each o ...

iStack Technology White Paper 2 Technology Description Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 11 Ring Topology Chain Topology Disadvantages Does not apply to long-distance stacking because the member devices need to be physically connected to each other. Provides low reliability. When a stack link fails, the stack cannot work properly and some devices cannot work. The entire st ...

iStack Technology White Paper 2 Technology Description Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 12 Fields in the stack packet header are described as follows:  Dst Mac: destination MAC address.  SrcMac: source MAC address.  VLAN Tag: VLAN tag, which identifies the VLAN used in a stack. By default, a stack uses VLAN 4093.  EthType: is fixed as 0x5100.  Version: is f ...

iStack Technology White Paper 2 Technology Description Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 13 ProtoType Packet Type Description 0x8 HeHuan Info It is not in use currently. 0x9 Modify Config Modifies the configuration. 0xa Load Loads the system software. 0xb Reset Resets a slave switch. 2.3 Stack State Machine Stacked devices run in one of the following states: Init, Electing ...

iStack Technology White Paper 2 Technology Description Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 14 2.4 Stack Setup Before a stack is set up, each switch is an independent entity with its own IP address and needs to be managed separately. In addition, link aggregation between switches is not supported. After a stack is setup, multiple switches are virtualized into one logical swit ...

iStack Technology White Paper 2 Technology Description Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 15 synchronizes the collected topology information, its own system software and configuration file to other member switches and runs stably. NOTE If the master and slave switches run different software versions, the slave switches synchronize the software version with the master switch ...

iStack Technology White Paper 2 Technology Description Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 16 A switch can be added to a stack after being powered off or with power on. In Figure 2-5, the new member switch is powered off before being added to the stack. Figure 2-5 Adding a member switch SwitchA Master SwitchB Standby SwitchC Slave SwitchD + SwitchA Master SwitchB Standby Swi ...