Bonded ISDN backup

[martinbuffleo]

I have been tasked with designing ISDN backup for my three branch offices.

I have one head office.

If one of my sites looses ADSL I need the branch office to dial the head office on a 256k bonded ISDN.

I can find configs for one to one dial in, but not one router in the head office and multi branch offices.

I'm also unable to use dynamic routing due to a strange limitation of our network design.

Any help would be greatly recieved.

[Simon Brooks]

Ip sla with tracking on default routes?


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[Simon Brooks]

I guess with one star feedback you dont want to use ip sla?


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[martinbuffleo]

Sorry that wasn't me that gave it a one star.

My area of concern is my Head office will have 4xISDN channels configured to listen for an inbound ISDN connection.

This could come from any of my branch offices.

As I cant use dynmic routing how would I know which Branch Office had dialed in and that I need to route traffic down the ISDN?