For reasons too complicated to describe (trust me, don't ask) I have two cisco 1921 routers with EHWICs wit 2 T1s back to back across two aggregateed fractional T1s. This CANNOT BE CHANGED.
I have 3 vlan segments (4 if you count a native vlan, id 1, that is not otherwise used). I have to bridge these vlans, because the same address space is used on each side. I have no DNS so cannot do the NAT thing. I have to bridge the vlans across the aggregated T1s. On one side the 1921 connects to an old 2950 on a trunked port. On the other side, the other 1921 connects to my 4506 on a trunked port.
I CANNOT get this working. I have tried bcp, subinterfaces, eveyrthing I can think. of. The routers see each other on the BVI IP addresses, but neither trunks succecsully to the attached switches or carries end to end traffic.
I have tried subinterfaces like below, and BCP with the vlan-range command. Nothing seems to work for me, BUT I have to get his going.
I was thinking some kind of q in q maybe?
CDP works across all the links. I can post configs if you think it will help, but all it will show is a non working trunk port config on the router. Like I said above, the T1 part works fine.
The VLANS I need are 1,10,100 and 108. VLAN 1 is the native vlan.
THanks for any help.
Dan Sichel
Ponderosa Telephone
