We have a new ISDN router Cisco 3845 connecting to Cisco 7600 Leased line router.We would like to use ISDN as backup.I have attached the network diagram.
Challenges:Cisco 3845 doen't support vlan creation & 7600 doesn't support bridging.
1.Referring to diagram, what is the best way to configure interface A&B and C&D.Is it better to create an L3 port-channel ?
2.Is it possible to create bridge in 3845 (interface B) & assign an ip address.Then create L3 vlan x in 7600 & assign interface A into vlan x ?
2.How the routing will take place when the Leased line will go down ?