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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 BFD to Monitor the Uplink Status

Configuring Association Between VRRP and BFD to Monitor the Uplink Status

Context

Because VRRP cannot detect faults on the uplink of a VRRP group, services may be interrupted. As shown in Figure 4-15, a VRRP group is associated with a BFD session on the master so that the BFD session monitors the uplink status of the master. If the BFD session detects a fault on the uplink, it immediately notifies the VRRP group that the priority of the master needs to be decreased, and an active/standby switchover is triggered. This reduces the impact of the uplink fault on service forwarding.

When the fault is rectified, the original master restores its priority to become the master again and begins forwarding traffic.

BFD implements millisecond-level detection. Association between VRRP and BFD provides a rapid active/standby switchover.

NOTE:
  • Only the S5720SI, S5720S-SI, S5720EI, S5720HI, S6720EI, and S6720S-EI support this function.

  • 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 4-15  Association between VRRP and BFD

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 master 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.
    NOTE:

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

  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, when the monitored BFD session becomes Down, the VRRP priority decreases by 10.

    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 a VRRP group is associated with a BFD session, the BFD session type cannot be modified. Before deleting the BFD session type, you must delete all original configurations.

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

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Updated: 2019-08-21

Document ID: EDOC1000141941

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