Please help with the following situation I am facing. I am implementing dial-up back up solution for DSL link. When the DSL link is down, the backup line comes up, meaning line protocol is up and traffic up to the router.
The issue is the dynamic routing does not work, all the routes are lost as soon as the backup line comes up. EIGRP is the routing protocol running on the router.
Since you are using IP unnumbered and have not included all the interfaces in your post its hard to say exactly what the issues is. Without all the addresses its hard to say if EIGRP will even form neighbors.
Verify that show EIGRP neighbor has a neighbor both when running on the serial line and on the backup.
Unless EIGRP is injecting a default route you will lose your default route when the serial line goes down since you route to the serial line. If you want to continute to use static put a second default static route in with a higher metric pointing to the dialup. This will allow you to still have a default route when the serial line is down.
Ip unnumbered tends to be a lot harder to troubleshoot. If your lan connection goes down you really won't know what the problem is since it will appear the WAN connection went down. Unless there is a reason not to I would eventually change this to use private addresses for your point to point. It makes configuration so much easier and you can just not advertise the private addresses if it will cause routing issues elsewhere in the network.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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