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CLI-based Configuration Guide - Reliability

AR100, AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 V200R010

This document provides guidance for configuring reliability services, including interface backup, BFD, VRRP, and EFM.
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Association Between a VRRP Group and the Interface Status to Monitor the Uplink Interface

Association Between a VRRP Group and the Interface Status to Monitor the Uplink Interface

A VRRP group can only detect the status change of the interface on which the VRRP group is configured. VRRP cannot detect faults on the uplink interface or direct uplink of the master, so services are interrupted. You can associate a VRRP group with the interface status. When the uplink interface or direct uplink of the master fails, the priority of the master is adjusted. This triggers an active/standby switchover and ensures proper traffic forwarding.

A VRRP group can monitor the interface status in Increased or Reduced mode:
  • In Increased mode, when the monitored interface becomes Down, the priority of the master increases.
  • In Reduced mode, when the monitored interface becomes Down, the priority of the master decreases.
Figure 7-6  Association between a VRRP group and the interface status

As shown in Figure 7-6, a VRRP group is configured between RouterA and RouterB. RouterA is the master and RouterB is the backup. RouterA and RouterB work in preemption mode. On RouterA, the Reduced mode is used to monitor uplink interface Interface1. When Interface1 becomes faulty, the priority of RouterA decreases. Then RouterB becomes the master through negotiation, ensuring that user traffic is forwarded correctly.

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Updated: 2019-08-12

Document ID: EDOC1100034076

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