What is the default interval for a VRRP advertisement?

The default interval for a VRRP (Virtual Router Redundancy Protocol) advertisement is indeed 1 second. This frequent advertisement interval is designed to ensure that the status of the virtual router is communicated promptly, allowing for quicker detection of any failures within the network. When the master router sends its advertisements every second, it enables backup routers to remain informed about the current master and ensures that they can take over in case the master router fails.

This rapid advertisement timeout is crucial in environments where rapid failover is critical for maintaining network availability. It minimizes the time it takes for a backup router to assume the role of the master router, thereby reducing potential downtime in network services. Thus, the choice of a 1-second interval strikes a balance between network overhead generated by the advertisements and the need for timely failover capability.