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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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Configuring Association Between VRRP and Peer BFD to Implement a Rapid Active/Standby VRRP Switchover

Configuring Association Between VRRP and Peer BFD to Implement a Rapid Active/Standby VRRP Switchover

Context

NOTE:
Only the S5720HI supports this function.

When a VRRP group is faulty, the backup detects the fault and switches to the master after the Master_Down_Interval timer expires. The switchover period is at least 3s. During this period, service traffic is still sent to the original master, causing user traffic loss. As shown in Figure 4-14, a peer BFD session is configured between SwitchA and SwitchB and used to rapidly detect communication faults of the VRRP group. When the BFD session detects a fault, an active/standby switchover is triggered immediately. This millisecond-level switchover reduces traffic loss.

After the fault is rectified, the VRRP group status on SwitchA and SwitchB is restored through VRRP negotiation.

NOTE:
  • A VRRP group can be associated with only a static BFD session or a static BFD session with automatically negotiated discriminators.

  • When a VRRP group is associated with a peer BFD session, the master and backup in the VRRP group must work in preemption mode. It is recommended that the preemption delay be 0 on the backup and nonzero on the master.

  • Multiple VRRP groups can monitor a BFD session, and a VRRP group can monitor a maximum of eight BFD sessions simultaneously.

Figure 4-14  Association between VRRP and peer BFD to implement a rapid active/standby VRRP switchover

Procedure

  1. Configure a static BFD session or a static BFD session with automatically negotiated discriminators. For the configuration procedure, see Configuring Single-Hop BFD, Configuring Multi-Hop BFD, or Configuring Static BFD with Automatically Negotiated Discriminators.
  2. Run:

    system-view

    The system view is displayed.

  3. Run:

    interface interface-type interface-number.subinterface-number

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

  4. Run:

    vrrp vrid virtual-router-id track bfd-session { bfd-session-id | session-name bfd-configure-name } peer

    Association between a VRRP group and a peer BFD session is configured.

    NOTE:
    • If session-name bfd-configure-name is specified, the VRRP group can bind to only the static BFD session with automatically negotiated discriminators.

    • If bfd-session-id is specified, a VRRP group can bind to only a static BFD session.

    • When a VRRP group is bound to an mVRRP group, the VRRP group maintains its status consistent with the status of the mVRRP group, and does not track BFD.

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Updated: 2019-08-21

Document ID: EDOC1000141941

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