Troubleshooting HSRP Virtual IP Address Mismatch

B.

Sure, I'd be happy to explain this in detail!

First, let's start by defining HSRP (Hot Standby Router Protocol). HSRP is a Cisco proprietary protocol that provides redundancy for IP networks, allowing for automatic failover in the event of a router failure. With HSRP, two or more routers participate in a virtual router group, with one router acting as the active router and the others as standby routers. The active router is responsible for forwarding packets sent to the virtual IP address, while the standby routers monitor the active router and take over in the event of a failure.

Now, let's take a closer look at the log message that the engineer received:

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Jan 1 12:12:12.111 : %HSRP-4-DIFFVIP1: GigabitEthernet0/0 Grp 1 active routers virtual IP address 10.1.1.1 is different to the locally configured address 10.1.1.25 

This message indicates that there is an HSRP group (group 1) configured on the GigabitEthernet0/0 interface of the router, and that the virtual IP address assigned to this group is 10.1.1.1. However, the active router in this group (presumably a different router) is using a different virtual IP address (10.1.1.25) than the one configured locally on this router.

So, which configuration change must the engineer make? The answer is B: Change the HSRP virtual address on the local router to 10.1.1.1. This is because the virtual IP address configured on the local router (10.1.1.1) does not match the virtual IP address used by the active router in the HSRP group (10.1.1.25), which can cause routing issues and result in packets being dropped. By changing the virtual IP address on the local router to match the one used by the active router (10.1.1.1), the engineer can ensure proper failover and routing functionality.

To summarize, the correct answer is B: Change the HSRP virtual address on the local router to 10.1.1.1.