We have 3 sites connected using a managed firewall/VPN solution.
This is a full mesh setup where Site A,B and C have redundant routes.
The ISP we have a contract with has persistant quality issues at Site A.
We need to have A and B in constant communication due to an ERP application that is time and delay sensitive.
We want to setup 3 Cisco 2600's and implement an ISDN backup link that will initiate a connection when any one of the VPN connections/interfaces goes down.
We plan on creating 2 interfaces per router. One pointing to the default route on the VPN device, the second will be the backup ISDN interface configured to dial another sites ISDN link.
Problem: The provider we are currently using will not enable dynamic routing
for devices not in their cloud unless we pay them $$$.
How can we configure the backup ISDN links to initialze if any of the VPN links go down?
Thanks in advance for any assistence.