What is the Configuration Command for HSRP Router?

B

HSRP (Hot Standby Router Protocol) is a protocol used to provide redundancy and load balancing between two or more routers in a network. HSRP routers work together as a group to present the appearance of a single virtual router. In this way, if the active router fails, another router in the group can take over the active role, ensuring that network traffic continues to flow without interruption.

To configure an HSRP router to become the active router if all other routers in the group fail, you would use the "preempt" command. The "preempt" command allows the router to take over as the active router if its priority is higher than the current active router. The configuration command to apply this is:

Router(config)#standby 1 preempt

This command configures the router with HSRP group number 1 to preempt other routers in the group if they fail. The router with the highest priority value will become the active router in the group. By default, the priority value is set to 100, so if you want a specific router to become the active router, you can increase its priority value.

Option A - "Router(config)#standby 1 priority 250" sets the priority value of the router to 250, which is higher than the default value of 100. However, this command alone does not ensure that the local interface becomes active if all other routers in the group fail. To achieve this, you would also need to include the "preempt" command.

Option B - "No additional configuration is required" is incorrect as the HSRP router needs to be configured with a priority value and preempt command to ensure that the local interface becomes active if all other routers in the group fail.

Option D - "Router(config)#standby 1 track Ethernet" is used to track the status of an interface. This command is used to reduce the priority of the router if a specific interface goes down. It does not ensure that the local interface becomes active if all other routers in the group fail.