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Huawei S Series White Paper

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

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Summary of Contents for Huawei S Series

  • Page 1 S Series Switches iStack Technology White Paper Issue Date 2013-05-25 HUAWEI TECHNOLOGIES CO., LTD.
  • Page 2 Notice The purchased products, services and features are stipulated by the contract made between Huawei and the customer. All or part of the products, services and features described in this document may not be within the purchase scope or the usage scope. Unless otherwise specified in the contract, all statements, information, and recommendations in this document are provided "AS IS"...

  • Page 3: Table Of Contents

    2.10 Automatic Software Upgrade of Member Switches....................28 2.11 Smooth Upgrade ............................... 28 2.12 iStack Packet Forwarding ............................30 2.12.1 Unicast Packet Forwarding ............................ 30 2.12.2 Unknown Unicast and Broadcast Packet Forwarding .................... 31 Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 4 2.12.4 Eth-Trunk Preferentially Forwarding Local Traffic ....................34 3 Product Capability ........................35 3.1 Stack Cables ................................35 3.2 Stack Parameters of S Series Switches ........................37 3.3 Switches That Do Not Support Stacking ........................42 4 Application Scenarios ........................ 43 4.1 Configuring a Stack with a Ring Topology .........................

  • Page 5: Feature Introduction

    Technology White Paper 1 Feature Introduction 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 availability, such as the aggregation layer, core layer, and data center.

  • Page 6: Concepts

    Switches that set up a stack form a stack domain. Multiple stacks can be deployed on a network. Therefore, a network has multiple stack domains, which have different domain IDs. Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 7: Istack Advantages

    MPU fails, the standby MPU becomes the new master MPU and starts to process services. A Huawei box switch has only one control plane and cannot implement redundancy. If a box switch fails, the connected network is interrupted. iStack technology can implement 1:1 redundancy on box switches.
  • Page 8 Technology White Paper 1 Feature Introduction Figure 1-3 Data forwarding before the master switch fails Network Network VRRP master device Slave Master Standby Slave iStack link Service flow Eth-Trunk Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 9: Uplink And Downlink Redundancy

    When a link fails, traffic on this link is evenly distributed to the other links. This link redundancy mechanism improves network reliability. Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 10 Slave Slave Master Standby iStack link Service flow Eth-Trunk Figure 1-6 Data forwarding after a link fails Network Slave Slave Master Standby iStack link Service flow Eth-Trunk Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 11: Redundancy Of Stack Links And Stack Ports

    The configurations of multiple switches at the corridors are simplified into the configuration of a stack, reducing management and maintenance costs. Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 12: Simplified Networking

    This simplified network does not require MSTP or VRRP, so network configuration is much simpler. Inter-device link aggregation also speeds up network convergence and improves network reliability. Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 13 S Series Switches iStack Technology White Paper 1 Feature Introduction Figure 1-9 Simplified networking iStack MSTP +VRRP Aggregation Access Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 14: Technology Description

    Data can be forwarded along the shortest path, improving bandwidth usage of stack links. Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 15: Stack Packets

    0 1 2 3 4 5 6 7 Dst MAC [4] Dst MAC [2] Src MAC [2] Src MAC [4] VLAN Tag EthType 0x5100 Version ProtoType Resv SrcFPort SrcStackId DesStackId Length Resv Packet Data Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 16: Stack Packet Types

    The master switch sends a HIGIG Info packet to a slave switch. After the slave switch receives this packet, it downloads the forwarding table and blocking point to the local LSW chip. Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 17: Stack State Machine

    Figure 2-2 Stack state machine ElectionFinish/ MasterDown/ CollectionFinish/ MasterChange MasterDown/ MasterChange ElectionFinish SystemStart Init Electing Collecting CollectionFinish/ StandAlone StandAlone ElectionFinish/ CollectionFinish/ MasterDown/ MasterChange Running StandAlone Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 18: Stack Setup

    During the setup of a stack, the master switch of the stack must be elected. The master switch then collects topology information about all member switches, assigns stack IDs to other member switches, and determines the standby and slave switches. Finally, the master switch Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 19: Member Switch Addition

    Assign Assign ACK Running state Running state Running state 2.5 Member Switch Addition You can add a switch a stably running stack, as shown in Figure 2-5. Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 20 Running state. Figure 2-6 shows how member switches exchange stack packets when a new member switch is added to the stack. Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 21: Member Switch Removal

     When a slave switch is removed, the master switch recalculates the stack topology information and synchronizes the information to other member switches. Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 22 Down, deletes neighbor information, and becomes the new master switch Nbr Lost SPDU Hehuan packet HIGIG packet Notifies SwitchC that it is the new Reselect the standby switch standby switch Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 23 Hehuan packet SPDU times out and the device is restarted Delete lost neighbor information Recalculates topology HIGIG packet information HIGIG packet Running state Running state Running state Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 24: Stack Merge

    Member switches in the stack whose master switch fails the master competition join the new stack. For details, see the process of adding a member switch. Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 25: Stack Split

    After the original stack splits, the original master switch processes the NBR Lost packet of SwitchD and deletes member switches (SwitchD and SwitchE). SwitchD and SwitchE restart and then set up a new stack. Figure 2-13 shows the packet exchange process. Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 26 Processes the NBR Lost A stack is set up packet in a similar manner as a member switch leaves a stack Running state Running state Running state Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 27: The Original Master And Standby Switches Are In Different Stacks After The Original Stack Splits

    Figure 2-14 Original master and standby switches are in different stacks after the original stack splits SwitchA SwitchE Master Slave Stack1 SwitchD Slave SwitchB Standby SwitchC Slave Stack split SwitchA Master SwitchB SwitchC Master Slave Stack1 Stack2 SwitchD SwitchE Standby Slave Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 28: Address Conflict Detection After A Stack Split

    In this topology, at least N dedicated direct links are required for MAD (N is the number of member switches). Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 29 When the stack is running properly, member switches do not process received MAD packets. After the stack splits, member switches send MAD packets over MAD links at an interval of 1s. Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 30 Figure 2-19 Two stacks as MAD relay agents of each other iStack SwitchA SwitchB SwitchC Domain ID 1 Eth-Trunk iStack SwitchD SwitchE SwitchF Domain ID 2 MAD link iStack link Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 31: Mad Collision Handling

    Active state. After the original stack in Active state and the faulty link recover, the stacks can merge. Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 32: Automatic Software Upgrade Of Member Switches

    Figure 2-21, you can perform a smooth upgrade in the stack to shorten the upgrade time and reduce impact of the upgrade on running services. Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 33 If errors occur during a smooth upgrade, member switches in the stack can automatically roll back to the original system version and set up a stack again. Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 34: Istack Packet Forwarding

    Figure 2-22 Intra-device unicast packet forwarding Master Slave Standby Figure 2-23 Inter-device unicast packet forwarding in a chain topology Master Standby Slave Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 35: Unknown Unicast And Broadcast Packet Forwarding

    Figure 2-25. This forwarding mode wastes bandwidth of intermediate stack links. Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 36 Stack Port 1 Port 2 Stack Stack Port 1 Port 2 Stack Stack Port 1 Port 2 Slave Slave Slave Slave Slot 4 Slot 4 Slot 3 Slot 3 Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 37: Multicast Packet Forwarding

    Figure 2-28. Multicast packets are forwarded as broadcast packets. Figure 2-28 Multicast packet forwarding Master 1 Standby 2 Slave 5 Slave 3 Slave 4 Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 38: Eth-Trunk Preferentially Forwarding Local Traffic

    Slave Slave Slot 1 Slot 1 Slot 2 Slot 2 Slot 3 Slot 3 Preferential Preferential local traffic local traffic forwarding is forwarding is not supported supported Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 39: Product Capability

    Table 3-2 SFP+ 1 m passive cable Attribute Description Cable model SFP+ high-speed cable-1m-(SFP+20M)-(CC2P0.254 black)-(SFP+20M)-indoor low-fume, halogenless and flame-retardant cable Connector X1/X2 SFP, 20-pin, male Color Black Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 40 Table 3-5 SFP+ 10 m active cable Attribute Description Outsourcing cable-SFP+ active high-speed Cable model cable-10m-(SFP+20M)-(CC2P0.32 black)-(SFP+20M)-indoor low-fume, halogenless and flame-retardant cable Connector X1/X2 SFP, 20-pin, male Color Black Length 10 m Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 41: Stack Parameters Of S Series Switches

    Connector X1/X2 PCIE Color Black Length Bend radius 75 mm 3.2 Stack Parameters of S Series Switches Table 3-7 Stack parameters of S2750-EI series switches Stack Parameter S2750-EI Stack connection mode Service port connection Stack port Two SFP ports (not combo ports) ...
  • Page 42  3 m, 10 m AOC cables (applicable in V200R003C00 and later versions)  10GE SFP+ optical module and optical fiber Maximum stack 10 Gbit/s bandwidth (unidirectional) Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 43 S5700-28C-EI-24S in V200R002 and supported on all the S5700-EI series in V200R003) Maximum stack 12 Gbit/s bandwidth (unidirectional) Remarks Any models of the S5700-EI series can set up a stack. Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 44 ES5D00X2SA00 and ES5D00X4SA00 front cards, which support two and four 10GE SFP+ optical ports respectively. NOTE After a front card is replaced, the stack configurations become invalid and need to be reconfigured. Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 45 Remarks Any models of the S6700-EI series can set up a stack. The 10GE ports cannot be used as stack ports when they work as GE ports. Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 46: Switches That Do Not Support Stacking

    S Series Switches iStack Technology White Paper 3 Product Capability 3.3 Switches That Do Not Support Stacking S5706, S5700S-LI, and S5710-HI do not support the stacking function. Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 47: Application Scenarios

    Figure 4-1 Diagram of configuring a stack with a ring topology SwitchB SwitchA GE0/0/28 GE0/0/27 GE0/0/27 GE0/0/28 GE0/0/28 GE0/0/27 GE0/0/27 SwitchC SwitchD GE0/0/28 Stack link Common link Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 48 Info: This operation may take a few seconds. Please wait for a moment..[SwitchC-stack-port0/1] quit [SwitchC] interface stack-port 0/2 [SwitchC-stack-port0/2] port interface gigabitethernet 0/0/28 enable Warning: Enabling stack port cause configuration loss on the interface, continue?[Y/N]:y Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 49 To specify a member switch as the master switch, power on the switch first. For example, to specify SwitchA as the master switch, SwitchB as the standby switch, SwitchC and SwitchD as slave switches, perform the following operations: Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 50: Configuring A Stack For Bandwidth Expansion

    0 and the stack ID of SwitchB to 1. Connect XGigabitEthernet 0/0/5 and XGigabitEthernet 1/0/5 to access switches, and add XGigabitEthernet 0/0/20, XGigabitEthernet 0/0/21, XGigabitEthernet 1/0/20, and XGigabitEthernet 1/0/21 to an Eth-Trunk to increase uplink bandwidth. Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 51 Before a stack is set up, the default stack ID of a device is 0. You can run the display stack or display stack peers command to view the stack ID of a device. Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 52 Stack system MAC: 80fb-06af-7570 MAC switch delay time: 10 min Stack reserve vlan : 4093 Slot of the active management port: -- slot Role Mac address Priority Device type Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 53: Example For Configuring Mad In Direct Mode

    MAD to reduce the impact of a stack split on the network. Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 54 Warning: This command will block the port, and no other configuration running on this port is recommended. Continue?[Y/N]:y # Configure MAD in direct mode on GigabitEthernet1/0/5. <HUAWEI> system-view [HUAWEI] interface gigabitethernet 1/0/5 [HUAWEI-GigabitEthernet1/0/5] mad detect mode direct Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 55: Example For Configuring Mad In Relay Mode

    When the stack splits because of a stack link fault and there are two devices with the same configuration on the network, you can use MAD to reduce the impact of a stack split on the network. Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 56 [HUAWEI] interface eth-trunk 1 [HUAWEI-Eth-Trunk1] mad detect mode relay [HUAWEI-Eth-Trunk1] quit [HUAWEI] interface gigabitethernet 0/0/5 [HUAWEI-GigabitEthernet0/0/5] eth-trunk 1 [HUAWEI-GigabitEthernet0/0/5] quit [HUAWEI] interface gigabitethernet 1/0/5 [HUAWEI-GigabitEthernet1/0/5] eth-trunk 1 Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 57: Configuration File

    GigabitEthernet2/0/27 # Check information about the proxy device SwitchD. <SwitchD> display mad proxy Mad relay interfaces configured: Eth-Trunk1 ----End Configuration File  Configuration file of the stack Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 58: Adding A Member Switch To A Stack

    Breaking the ring on the link between the master and standby switches will cause the reelection of the standby switch and result in the role changes of member switches. Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 59: Removing A Member Switch From A Stack

    Layer 3 devices. Currently, the impact of removing the master switch from a stack on existing services is the same regardless of which way the master switch is removed. Step 2 Remove the member switches. Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 60 MAC address switching delay to inherit the configuration of the member switch. After the stack MAC address switching delay expires, the removed device uses its own system MAC address. ----End Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 61: Troubleshooting

    NOTE Saving the results of each troubleshooting step is recommended. If your troubleshooting fails to correct the fault, you will have a record of your actions to provide Huawei technical support personnel. CAUTION Before replacing a switch, inserting a stack card or stack cable, or replacing a stack card, power off the switch.
  • Page 62 Run the display elabel command to view the electronic label. The Description field in the command output indicates the device model. <HUAWEI> display elabel /$[System Integration Version] /$SystemIntegrationVersion=3.0 [Slot_0] /$[Board Integration Version] /$BoardIntegrationVersion=3.0 [Main_Board] /$[ArchivesInfo Version] /$ArchivesInfoVersion=3.0 [Board Properties] Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 63 If fields under [Board Properties] are not empty, the electronic label has been loaded to the switch. Go to step 5. <HUAWEI> display elabel /$[System Integration Version] /$SystemIntegrationVersion=3.0 [Slot_0] Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 64 ID 0, run the display elabel slot 0 2 command.  If all fields under [Board Properties] are empty, the stack card does not function properly. Replace the stack card. <HUAWEI> display elabel slot 0 2 /$[System Integration Version] /$SystemIntegrationVersion=3.0 [Slot_0] /$[Board Integration Version] /$BoardIntegrationVersion=3.0...
  • Page 65 Item= Description= Manufactured= VendorName= IssueNumber= CLEICode= BOM=  If fields under [Board Properties] are not empty, go to step 6. <HUAWEI> display elabel slot 0 2 /$[System Integration Version] /$SystemIntegrationVersion=3.0 [Slot_0] /$[Board Integration Version] /$BoardIntegrationVersion=3.0 [Main_Board] /$[ArchivesInfo Version] /$ArchivesInfoVersion=3.0 [Board Properties]...

  • Page 66: A Stack Cannot Run Properly Because One Member Switch Becomes Faulty

    If the fault persists, go to step 8. Step 8 Collect the following information and contact Huawei technical support personnel.  Results of the preceding troubleshooting procedure ...
  • Page 67 3. Then the master switch 1, standby switch 2, and slave switches 3 and 4 form a stack with a chain topology. The new stack cable between the standby switch 2 and slave switch 4 is still Down. Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 68 Slot 4 Slot 3 Figure 5-4 Networking after the isolation of a slave switch Master StandBy Slot 1 Slot 2 Slave Slave Slot 4 Slot 3 ----End Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 69: Faq

    Master switch: The stack ID indicator is blinking. The method to check the stack ID on the master switch is the same as that used on non-master switches. Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 70: What Is The Bandwidth Limitation On The S5700-Si&S5700-Ei

    10GE interfaces with their rates limited, so the actual bandwidth of the subcard is 4x10 Gbit/s. This subcard occupies all the 4x10 Gbit/s bandwidth of the chip, so there is no available bandwidth for the stack card. Issue 01 (2013-05-25) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

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