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Configuration Guide - Reliability

S7700 and S9700 V200R011C10

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

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 the switchover period, service traffic is still sent to the original master, causing user traffic loss. As shown in Figure 3-14, 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 non-0 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 3-14  Association between VRRP and peer BFD to implement a rapid active/standby VRRP switchover

Procedure

  1. Configure a static 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, a VRRP group can bind to only a 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: 2019-10-18

N. documento: EDOC1000178318

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