In my client place 1721 router is installed with two wan links on S0 & E0.int s0 is leased line connectivity and e0 connecitivity is radio link.i want to make e0 as redaundant link for s0 i.e if s0 link goes down e0 link should be up automatically.Pls help me to solve this issue.Both wan connectivity are from seperate routers.
I guess the easiest way would be just to make the Ethernet0 interface the backup interface for your Serial 0 interface and put a floating static route with an administrative distance into your configuration higher than any other route. The config would look like this:
backup interface ethernet0
ip route 0.0.0.0 0.0.0.0 ethernet0 250
This way, in case the serial line goes down, the Ethernet interface kicks in as the backup interface, and all traffic is routed through that interface.
if ur facing probs with redundandcy(ie.,auto fallback) and if both the links are connected to the same remote location ,try configuring 2 tunnels with ones source as ur serial and others as ur ethernet.
keepalives are reqd on both the sides and use floating static routes(primary - tunnel with serial as source and secondary - tunnel with ethernet as source with higher admin distance).
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