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Troubleshooting VRRP

Problem

Description

If you configure multiple VRRP groups on an interface (using multiple VLANs), traffic for some of the groups might be briefly dropped if a failover occurs. This can happen because the new primary must send gratuitous ARP replies for each VRRP group to update the ARP tables in the connected devices, and there is a short delay between each gratuitous ARP reply. Traffic sent by devices that have not yet received the gratuitous ARP reply is dropped (until the device receives the reply and learns the MAC address of the new primary).

Solution

Configure a failover delay so that the new primary delays sending gratuitous ARP replies for the period that you set. This allows the new primary to send the ARP replies for all of the VRRP groups simultaneously.