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Configuration Guide - Reliability

CloudEngine 8800, 7800, 6800, and 5800 V200R003C00

This document describes the configurations of Reliability, including BFD Configuration, VRRP Configuration, DLDP Configuration, Smart Link and Monitor Link Configuration, EFM Configuration, and CFM Configuration.
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Configuring Association Between VRRP and VRID-based Dynamic BFD

Configuring Association Between VRRP and VRID-based Dynamic BFD


When a VRRP group is faulty, the backup with the highest priority detects the fault and switches to the master after the Master_Down_Interval timer expires. The switchover period is at least 3s. During this switchover period, service traffic is still sent to the original master, causing loss of user traffic. In Figure 3-16, a VRRP group is configured on SwitchB to monitor the VRID-based dynamic BFD session so that the BFD session can rapidly detect communication faults of the VRRP group. After receiving the session Down event, SwitchB immediately switches to the master and sends gratuitous ARP packets to update MAC address entries on the switch.


The master and backup in the VRRP group must work in preemption mode. It is recommended that the preemption delay be zero on the backup and non-zero on the master.

Figure 3-16 Association between VRRP and VRID-based dynamic BFD to implement a rapid active/standby switchover


  1. Run system-view

    The system view is displayed.

  2. Run bfd

    BFD is enabled globally and the BFD view is displayed.

    By default, BFD is disabled globally.

  3. Run quit

    Return to the system view.

  4. Run interface interface-type interface-number

    The view of the interface on the backup where a VRRP group is configured is displayed.

  5. 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.

    The mode switching function takes effect when the interface only has attribute configurations (for example, shutdown and description configurations). Alternatively, if configuration information supported by both Layer 2 and Layer 3 interfaces exists (for example, mode lacp and lacp system-id configurations), no configuration that is not supported after the working mode of the interface is switched can exist. If unsupported configurations exist on the interface, delete the configurations first and then run the undo portswitch command.


    If many Ethernet interfaces need to be switched to Layer 3 mode, run the undo portswitch batch interface-type { interface-number1 [ to interface-number2 ] } &<1-10> command in the system view to switch these interfaces to Layer 3 mode in batches.

  6. Run vrrp vrid virtual-router-id bfd peer-ip peer-ip-address

    A VRID-based dynamic BFD session for a VRRP group is created and a peer IP address for the session is configured.

  7. (Optional) Run vrrp vrid virtual-router-id bfd { min-rx-interval receive-interval | min-tx-interval transmit-interval | detect-multiplier multiplier-value } *

    Parameters for the VRID-based dynamic BFD session are configured.

    By default, the minimum intervals at which the local device receives and sends BFD control packets are 1000 ms, and the local detection multiplier is 3.

  8. Run commit

    The configuration is committed.

Updated: 2019-05-08

Document ID: EDOC1100004359

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