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Configuration Guide - Virtualization

CloudEngine 8800, 7800, 6800, and 5800 V200R005C10

This document describes the configurations of virtualization, including stack and SVF.
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Example for Configuring DAD in Relay Mode on Eth-Trunk

Example for Configuring DAD in Relay Mode on Eth-Trunk

Networking Requirements

As shown in Figure 1-35, SwitchA and SwitchB set up a stack and connect to the upstream and downstream devices through Eth-Trunk. It is expected that stack split detection will be performed through Eth-Trunk.

Figure 1-35 DAD in relay mode on an Eth-Trunk

Configuration Roadmap

The configuration roadmap is as follows:
  1. Use SwitchC as a DAD relay agent. On the stack, configure DAD in relay mode on Eth-Trunk10 connected to SwitchC.

  2. On SwitchC, enable the DAD relay function on Eth-Trunk10 so that DAD packets can be forwarded through Eth-Trunk10.


    To enable DAD packets to be forwarded over Eth-Trunk member links, use a switch that supports the DAD relay function as the relay agent. All Huawei CloudEngine series switches support the DAD relay function. Huawei S series switches support this function since V200R002C00.


  1. On the stack, configure DAD in relay mode on Eth-Trunk10.

    <HUAWEI> system-view
    [~HUAWEI] interface eth-trunk 10
    [*HUAWEI-Eth-Trunk10] trunkport 10ge 1/0/5
    [*HUAWEI-Eth-Trunk10] trunkport 10ge 2/0/5
    [*HUAWEI-Eth-Trunk10] dual-active detect mode relay
    [*HUAWEI-Eth-Trunk10] commit
    [~HUAWEI-Eth-Trunk10] return

  2. On SwitchC, enable the DAD relay function on Eth-Trunk10.

    <HUAWEI> system-view
    [~HUAWEI] sysname SwitchC
    [*HUAWEI] commit
    [~SwitchC] interface eth-trunk 10
    [*SwitchC-Eth-Trunk10] trunkport 10ge 1/0/1
    [*SwitchC-Eth-Trunk10] trunkport 10ge 1/0/2
    [*SwitchC-Eth-Trunk10] dual-active proxy
    [*SwitchC-Eth-Trunk10] commit
    [~SwitchC-Eth-Trunk10] return

  3. Verify the configuration.

    # Check the detailed DAD configuration on the stack.

    <HUAWEI> display dual-active
    Stack domainID: 10
    Dual-active status: Normal
    Dual-active detect mode: Relay
    Dual-active detect configuration of MEth: Disable
    Dual-active direct detect interfaces configured:
    Dual-active relay detect interfaces configured:
       10GE1/0/5       up  (Physical)  up  (Protocol)  10   (PeerDomain)
       10GE2/0/5       up  (Physical)  up  (Protocol)  10   (PeerDomain)
    Excluded ports(configurable):
    Excluded ports(can not be configured):

    # Check DAD relay information on SwitchC.

    <SwitchC> display dual-active proxy
    Dual-active proxy interfaces configured:
          10GE1/0/1        up
          10GE1/0/2        up

  4. Verify the DAD function.

    After the DAD function is configured:
    • If a stack split occurs, the alarm "DAD_1. hwDadConflictDetect" is generated.
    • If the stack recovers from a split, the alarm "DAD_1. hwDadConflictResume" is generated.
    If no service is configured in the stack, simulate a stack split situation to check whether the DAD function is configured successfully.

    Do not trigger a stack split when services are running on the stack. Otherwise, services are affected.

    1. Trigger a stack split by disabling all ports with stack cables connected or removing all stack cables.

    2. Run the display stack command to check whether the number of stack member switches reduces. If so, the stack has split.

    3. Run the display trapbuffer command to check whether there are DAD alarms.
      <HUAWEI> display trapbuffer
      Aug 15 2016 14:32:35 HUAWEI %%01DAD/1/hwDadConflictDetect(t):CID=0x807f0419-OID=;Dual-active scenario is detected.
    4. The preceding operations verify that the DAD function has been configured successfully.

    5. Restore the stack by enabling all ports used for stack connections or reconnecting stack cables so that the stack can be set up again.

Configuration Files

  • Stack configuration file

    interface 10GE1/0/5
     eth-trunk 10
    interface 10GE2/0/5
     eth-trunk 10
    interface Eth-Trunk10
     dual-active detect mode relay
  • SwitchC configuration file

    sysname SwitchC
    interface 10GE1/0/1
     eth-trunk 10
    interface 10GE1/0/2
     eth-trunk 10
    interface Eth-Trunk10
     dual-active proxy
Updated: 2019-04-03

Document ID: EDOC1100075367

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