I am consulting at a company that uses Frame Relay to connect to alot of its WAN sites. They have a backup system that uses ISDN to dial if the Frame ever fails.
I was looking at the ISDN router today as well as one of the routers at one of the WAN sites, and it is not apparent how the ISDN is triggered when the Frame Fails.
What should I be looking for here? I am going to post a config here with the dial string altered so that someone whom has experience with this may be able to help.
>> dialer watch-list 1 ip 192.168.3.0 255.255.255.0
the dialer watch list feature is used:
it monitors the presence in the routing table of one or more IP prefixes.
if the prefixes are missing it dials to HQ.
this is handy to implement dial backup over multiple routers: that is primary link and backup link are on different routers.
Hope to help