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Configuration Guide - Reliability

CloudEngine 12800 and 12800E V200R002C50

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 Routing to Monitor the Uplink Status

Configuring Association Between VRRP and Routing to Monitor the Uplink Status

Context

VRRP cannot detect faults on the uplink of a VRRP group, which may cause service interruption. The VRRP group monitors the number of routes on the uplink forwarding path. When the route is withdrawn or becomes inactive, the master's priority is adjusted and an active/standby switchover is triggered. This reduces the impact of the link fault on service forwarding.

When the fault is rectified, the original master restores its priority and becomes the master again to forward traffic.

During route association, the link switchover depends on convergence of a routing protocol associated with the VRRP group.

NOTE:
  • When a VRRP group is associated with a static route, the device can detect only faults on the direct uplink.

  • 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.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run interface interface-type interface-number

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

  3. 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.

    NOTE:

    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.

  4. Run vrrp vrid virtual-router-id track ip route ip-address { mask-address | mask-length } [ vpn-instance vpn-instance-name ] [ increase value-increased | reduce value-reduced ]

    Association between a route and a VRRP group is configured.

    By default, the master's priority decreases by 10 if the associated route is withdrawn or becomes inactive.

    When setting the value by which the priority decreases, ensure that the priority of the backup is higher than the priority of the master.

  5. Run commit

    The configuration is committed.

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Updated: 2019-03-21

Document ID: EDOC1000166606

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