What is the default hello timer for HSRP?

The default hello timer for Hot Standby Router Protocol (HSRP) is 3 seconds. The hello timer is the interval at which HSRP routers send hello messages to each other to establish and maintain their neighbor relationship. This frequency ensures that routers can quickly detect the failure of the active router and initiate the failover process, providing redundancy in the event of a link or device failure.

Other values, like 10 seconds, 5 seconds, and 1 second, represent various configurations that you could use for the hello timer in HSRP, but 3 seconds is the standard configuration set by default. Therefore, understanding the default of 3 seconds is essential for configuring HSRP and optimizing network redundancy effectively.