Is there a way I can configure the 2811 router so that if a serial interface was to go down it will then shut down its own E1 interface?
I just did this for someone else. See
I outlined examples that will work with 12.4T (using Enhanced Object Tracking) and code prior to 12.4T using syslog.
Nope, but I do have a doc URL for you:
To revise my earlier post, you'll need EEM 2.2 - IOS 12.4(2)T - to use the "track" feature. Hopefully you bought SMARTnet with it so you can download the release you need.