Having tried and failed to get the following scenario to work can anyone offer some advise please?
Central router with one ISDN WIC dials another router to reach a particular network. That works fine. The snag is , that when the number it is dialing either fails or is unavailable, it should dial a different number to a different router, to reach the same network.
Sounds easy I thought - not so to date!
I've tried floating statics, different methods of defining the default route, two profiles etc. Tried EIGRP but I cannot have the customers ISDN line up just for the sake of EIGRP, due to cost issues.
So, using the same physical interface, I need to have a backup method to dial a different router
All you need to configure is two dialer strings under the lagacy dialer interface one after the other in the order of which you want the router to dial. So with that router will always try to dial the first dialer string number and if it rings busy or the router do not get CONNECT at isdn layer, it will dial the next dialer string to get connection.
So all you need to have is a good backup scheme which triggers isdn dialing and two dialer strings under a physical or a dialer interface one after the other the way you want router to attempt the call.
Router will always dial the first number. So lets say 2nd number is working fine but now the router need to dialout again because of load increased, it will still follow the top down approach for number dialing. So it will dial the first number again and if it fails again, it will dial the 2nd number. So the first number will be dialed all the time.
So everytime the call is triggred, router will dial the first one and then go onwards if it fails.
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