I got a question related to ISDN connecting three routers.
My topology is the following:
R1 and R2 are on HSRP (R1 is master) so that the Ethernet work as only one. Since ISDN interface cannot be used for HSRP I will have the ISDN interfaces as "independent" interfaces where the information will be routed according to the routing table.
When there is traffic from R1 or R2 to R3 should not be a problem to bring up the line. The problem is that in most of the cases it will be R3 who is dialling.
So, my question is, how can I configure R3 to decide where to dial depending on the HSRP active router? Is it possible?
If not, my idea was to call (via dialer map) R1, and if it does not answer, call R2. How can I do that? I've looked in the documentation available but I have not been able to find any helpful informationâ¦