We’re now going to test a different topology introduced at the end of article #2.
We are now going to test the HOLDDOWN timer of RIP when the backup router send a route with a metric higher than the primary router.
In this series of tests, we’ll see if the HOLDDOWN works in case the route disappears of R100 because of HOLDDOWN timer. Next time, we’ll see if it disappear if R101 advertises a metric 16 for NETWORK.
Let’s continue our discovery of the RIP timers in a slightly different topology, and discover the odd Holddown timer.
What is IP unnumbered?
In Cisco routers, the ip unnumbered <other_interface> command allows you to borrow the IP address of another interface.
Although the Cisco help page explains in detail how to do it, and to some extent the reasons to do so, let’s go deeper and explain the real howto.