RIP route has multiple fields such as Peer, Metric, Age, and Next-hop etc. Normally next-hop has just 0.0.0.0, and traffic to this destination will be sent to RIP peer.
However, there is case that this next-hop field need to be used for efficient traffic forwarding.
In below diagram, router which doesn’t have RIP functionality having the destination route of the traffic. In this case, R2 can distribute the route to RIP domain instead of R3, but R2 will distribute the route with ip address of R3 as a next hop. So, the traffic to the destination will directly forward to R3 without traverse R2.
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