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Two Cisco routers share a transit link, with a loopback at each end.
Start EIGRP with the same autonomous system number on both routers.
The neighbor table shows router two, and the topology table shows the learned loopback.
Check the installed EIGRP route, then ping from one loopback to the other.
Make the transit interface passive and watch the learned route disappear.
Remove the passive setting and confirm that the route and ping return.
Remove EIGRP from both routers and confirm the remote route is gone.
Enable RIP version two on both routers and include the transit and loopback networks.
The remote loopback is now a one hop RIP route, and the ping succeeds.
Remove router two’s loopback network from RIP to withdraw its advertisement.
The remote loopback stops replying, but the directly connected router still answers.
Advertise the loopback again and verify that the route and ping return.