I am trying to figure out a way to make my network redundant to the backplane of my 3640 edge router running 12.2(23). I have 2 ethernet interfaces in 2 different slots on the router. I would like to make e1/0 backup e0/0 in case of a network module failure. I've searched hard but can't find the technique to do this. I've seem where it can be done with bri interfaces, and between routers with hsrp/vrrp, but not with ethernet interfaces inside the same router. I'm stuck. Hopefully, I'm just overlooking a simple solution. Any ideas? All recommendations are appreciated.
Thanks,
BT