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S12700 V200R010C00 Configuration Guide - Reliability

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 BFD to Implement a Rapid Active/Standby Switchover

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

Context

When a VRRP group becomes faulty, the backup with the highest priority detects the fault and becomes the master after the Master_Down_Interval timer expires. The switchover period lasts at least 3s. During this period, service traffic is still sent to the original master, causing user traffic loss. In Figure 3-13, the VRRP group is associated with a BFD session on the backup so that the BFD session can rapidly detect communication faults of the VRRP group. If the BFD session detects a fault, it immediately notifies the VRRP group that the priority of the backup needs to be increased, and an active/standby switchover is triggered. This millisecond-level switchover reduces traffic loss.

When the fault is rectified, the priority of the backup is restored and the original master becomes the master again to forward traffic.

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

  • 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 3-13  Association between VRRP and BFD to implement a rapid active/standby switchover

Procedure

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

    system-view

    The system view is displayed.

  3. Run:

    interface interface-type interface-number

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

  4. (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.

  5. Run:

    vrrp vrid virtual-router-id track bfd-session { bfd-session-id | session-name bfd-configure-name } [ increased value-increased | reduced value-reduced ]

    Association between VRRP and BFD is configured.

    By default, a VRRP group is not associated with a BFD session.

    NOTE:
    When associating a VRRP group with a BFD session, note the following points:
    • If session-name bfd-configure-name is specified, the VRRP group can be bound to only the static BFD session with automatically negotiated discriminators.

    • If bfd-session-id is specified, the VRRP group can be bound to only the static BFD session.

    • After the value by which the priority increases is set, ensure that the priority of the backup is higher than the priority of the master.

    • When a BFD session is associated with VRRP, the system does not allow the associated BFD session to be deleted by default. To delete the associated BFD session, run the bfd session nonexistent-config-check disable command to disable the device from checking whether the associated BFD session is deleted.

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Updated: 2019-08-21

Document ID: EDOC1000142090

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