A network administrator is configuring Cisco HSRP group 5 on interface GigabitEthernet0/0 of a primary router. The interface is assigned the physical IPv4 address 10.1.10.2/24. When executing the command `standby 5 ip 10.1.10.2`, the router rejects the configuration. Which statement correctly explains why Cisco IOS rejects this command?
- HSRP requires the virtual IPv4 address to be unique and not match the physical IP address of any participating router interface.Answer
- BVRRP protocol rules automatically enforce that the primary master router must use its own physical IP address as the virtual IP address in HSRP.
- CHSRP virtual IPv4 addresses must be configured from a separate, non-overlapping IP subnet than the physical interface IP address.
- DHSRP group numbers must match the host portion of the interface physical IPv4 address before the virtual IP command is accepted.
Answer
HSRP requires the virtual IPv4 address to be unique and not match the physical IP address of any participating router interface.
In HSRP, the virtual IPv4 address shared by the redundancy group must be a unique IP address in the local subnet that is not assigned as the physical interface address of any member router. When a network administrator attempts to assign an existing physical IP as the HSRP virtual IP, Cisco IOS rejects the command.
Step-by-Step Solution
Key Concept
HSRP Virtual IP Address Assignment Rules