ISDN Backup - A remote config for two different locations it can dial

[patrick.hurley]

I have a customer that wants ISDN backup to dial two different head ends. The first under normal circumstances and the second in case the first location disappears. Is there a link for that configuration on Cisco?

[thisisshanky]

Are you going to use two different BRI interfaces ?

You can run a routing protocol such as eigrp or ospf and over the primary link (use DDR or Dialer profiles) and watch a prefix on the routing table. This can be used to trigger the backup isdn link.

If using the same BRI, I think you can use two dialer strings or dialer maps one after the other, and if first number is busy, it dials the second number.

[b-ulrich]

You are going to have to use dialer profiles and create 2 dialer interfaces, use 2 different dialer groups. You may want to research on dialer pools because you have way more flexibility with this method.

B