Which command is used to configure the HSRP virtual IP on an interface?

To configure the HSRP (Hot Standby Router Protocol) virtual IP on an interface, the command used is "standby group-number ip ip-address." This command specifies the HSRP group number and the virtual IP address that the routers in the group will use for active and standby configurations.

In detail, the "standby" command initiates the HSRP configuration, "group-number" identifies which group of routers will share the virtual IP, and "ip" indicates that you are setting the virtual IPv4 address. The "ip-address" is the actual virtual IP that will be used by the HSRP group.

This configuration is essential for enabling fault tolerance and ensuring that if the active router fails, another router in the group can take over the virtual IP seamlessly, allowing uninterrupted network service. Properly designing this HSRP setup can greatly enhance network availability and reliability.