Refer to the exhibit. Company Ahas three routers on its campus. IS-IS is used as an interior routing protocol in AS 4942. Routers R1 and R2 are located in the IS-IS Level 1 area, and they have been co

Implementing a `route-map out` would affect routes R1 advertises, not routes it receives, and thus would not help R1 maintain connectivity to external subnets if an upstream router fails.

The `set ip next-hop 21.23.32.25` command within a route map changes the BGP next-hop attribute of the routes to point to the VRRP Virtual IP. This ensures that internal traffic from R1, destined for 10.10.10.0/21 (assumed to be an external subnet for this solution), is always sent to the active VRRP gateway (either R2 or R3), providing failover capability.

Applying the route map with `bgp address-family ipv4 route-map <map-name> in` ensures that routes for the external subnet 10.10.10.0/21, when received by R1 (likely from R2 via iBGP), are processed and their next-hop attribute is modified as they are installed into R1's BGP table. This allows R1 to direct traffic to the redundant VRRP VIP.

While `set bgp next-hop` also sets the BGP next-hop, `set ip next-hop` is the more conventional and direct command for specifying a literal IP address as the next-hop in a route map for BGP. In this context, `set ip next-hop` is the precise command to use.

The `set ip bgp next-hop-self` command changes the next-hop to the advertising router's own IP address, which is not the VRRP VIP required for redundancy to external subnets.