Association Between VRRP and BFD/NQA/Routing to Monitor the Uplink
VRRP can detect only faults in VRRP groups. Association between a VRRP group and the interface status allows the device to detect faults on the uplink interface or direct uplink of the master. When an indirect uplink of the master fails, VRRP cannot detect the fault, causing user traffic loss. You can configure association between VRRP and BFD/NQA/routing to solve this problem. Association between VRRP and BFD/NQA/routing allows the device to detect faults on the uplink of the master. When the uplink of the master fails, BFD/NQA/routing rapidly detects the fault and notifies the master of adjusting its priority. This triggers an active/standby switchover and ensures proper traffic forwarding.
As shown in Figure 7-7, 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. BFD/NQA/routing is configured to detect faults on the link from RouterA to RouterE, and association between VRRP and BFD/NQA/routing is configured on RouterA. When BFD/NQA/routing detects the fault on the link from RouterA to RouterE, BFD/NQA/routing instructs the master to adjust its priority. RouterB becomes the master through negotiation, ensuring that user traffic is forwarded correctly.
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