Default Interval for a VRRP Advertisement

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By default, the master router sends VRRP advertisement packets every second to all members of the VRRP group. These packets indicate that the master router is still operational. If the master router fails or becomes unreachable, the backup router with the highest priority value becomes the new master router.

Reference: https://www.juniper.net/documentation/en_US/junos/topics/task/configuration/vrrp-master-router-advertisement-interval-configuring.html

VRRP (Virtual Router Redundancy Protocol) is a protocol used to increase network availability by allowing multiple routers to participate in a virtual router group. The VRRP group is represented by a virtual IP address and a virtual MAC address.

To ensure that the active router in a VRRP group is known by all other routers, VRRP sends advertisement messages to its group members at regular intervals. These advertisement messages contain information about the virtual router's priority, state, and status.

The default interval for a VRRP advertisement is 1 second. This means that the active router in a VRRP group sends an advertisement message to its group members every second. The other routers in the group listen for these messages to determine the active router's status.

However, it's worth noting that the advertisement interval can be configured to a different value using the "advertisement-interval" command. This command can be used to increase or decrease the interval between advertisement messages, depending on the specific requirements of the network.

In summary, the default interval for a VRRP advertisement is 1 second, but it can be configured to a different value if necessary.