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Configuration Guide - Reliability

S1720, S2700, S5700, and S6720 V200R010C00

This document describes the configuration of BFD, DLDP, VRRP, SmartLink, CFM, EFM, Y.1731 and MAC swap loopback to ensure reliability on the device.
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Creating a VRRP Group

Creating a VRRP Group


VRRP virtualizes multiple devices into one gateway without changing the networking, and uses the virtual gateway's IP address as the default gateway address to implement next-hop gateway backup. After a VRRP group is configured, traffic is forwarded through the master. If the master fails, a new master is selected from the backups to forward traffic. This implements gateway backup.

If load balancing is required in addition to gateway backup, configure two or more VRRP groups on an interface in multi-gateway load balancing mode.


  • Create a VRRP group working in active/standby mode.

    1. Run:

      The system view is displayed.

    2. Run:
      interface interface-type interface-number

      The interface view is displayed.

      You are advised not to configure a VRRP group on the VLANIF interface corresponding to a super-VLAN. If VRRP groups are configured on the VLANIF interface corresponding to a super-VLAN, the maximum number of VLANs including common VLANs, super-VLANs, and sub-VLANs is as follows:
      • S5720EI, S6720EI and S6720S-EI: 500

      • S5720SI and S5720S-SI: 312

      If the maximum value is exceeded, device performance may be affected.

    3. (Optional) On an Ethernet interface, run undo portswitch

      The interface is switched to Layer 3 mode.

      By default, an Ethernet interface works in Layer 2 mode.


      Only the S5720HI, S5720EI, S6720EI, and S6720S-EI support switching between Layer 2 and Layer 3 modes.

    4. Run:
      vrrp vrid virtual-router-id virtual-ip virtual-address

      A VRRP group is created, and a virtual IP address is assigned to the VRRP group.

      By default, no VRRP group is created.

      • If many VRRP groups are configured, increase the CPCAR for VRRP Advertisement packets. Improper CPCAR settings will affect services on your network. If you need to adjust CPCAR settings, you are advised to contact Huawei technical personnel for help.

        You can also configure an mVRRP group and bind VRRP groups to the mVRRP group to prevent CPU resources consumed by protocol packets.
  • Create VRRP groups working in multi-gateway load balancing mode.

    If VRRP groups need to work in multi-gateway load balancing mode, repeat the steps to configure multiple VRRP groups on the interface and assign different VRIDs to them.

Updated: 2019-08-21

Document ID: EDOC1000141941

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