A network administrator is configuring Hot Standby Router Protocol (HSRP) on a Cisco router interface that has already been assigned the physical IPv4 address 192.168.10.1/24. The administrator attempts to execute the command `standby 1 ip 192.168.10.1` on this interface. What is the result of executing this command?
- The router rejects the command because HSRP does not permit assigning a router's physical interface IP address as the virtual IP address.Answer
- BThe router accepts the command and automatically sets its HSRP priority to 255 to become the IP address owner.
- CThe command is accepted, but HSRP preemption is permanently disabled to prevent an IP address conflict with standby routers.
- DThe command succeeds and the router immediately transitions to the Standby state regardless of its configured priority value.
Answer
The router rejects the command because HSRP does not permit assigning a router's physical interface IP address as the virtual IP address.
In Hot Standby Router Protocol (HSRP), the virtual IP address must be an unused, unique IP address within the local IPv4 subnet. Unlike Virtual Router Redundancy Protocol (VRRP), which allows the virtual IP address to match a physical interface IP address (making that router the IP address owner with priority 255), HSRP explicitly forbids using any member router's physical interface IP address. Attempting to do so in Cisco IOS results in an error message rejecting the command.
Step-by-Step Solution
Key Concept
HSRP Virtual IP Address Assignment Constraints