Cannot Get Bridge Link Up!!

[spock9458]

I have made a drawing of my Topology here:

http://www.sanjuantitle.com/BridgeScenario1.pdf

No matter what I have tried, the line protocol for the Serial interface will not stay up. I have tried setting it up as a 'routed' path, changing the subnet at the Branch office and configuring ip routes.... this will work, but only at low bandwidth (8 channels maximum or the line protocol goes down) - I believe this is because there is no clock source in the dsu/csu and one cannot be set with the WIC-1T WAN card. Maybe someone can verify that.

Switching to WIC-1DSU-T1 card will not work, I don't think, because it has an RJ-45 interface, and I need to connect it to either an RS-232 or V.35 connector.

So I went back and tried to set this up as a transparent bridge. Here are the relevant config lines in both Router A and B:

!
interface FastEthernet0
description Connected to LAN
ip address 192.168.40.200 255.255.255.0
no ip route-cache
speed auto
bridge-group 1
!
interface Serial0
no ip address
no fair-queue
bridge-group 1
!
router rip
version 2
network 192.168.40.0
no auto-summary
!
bridge 1 protocol ieee
bridge 1 route ip


When I tried using the global command: 'bridge irb' I lost the ability to get through the FastEthernet port of the Router... obviously I need some other commands to make that work, if it's even possible?

When I tried using the global command: 'bridge crb' - the line protocol on the Serial0 interface refuses to stay up!

Note that when attempting the 'bridge' configuration, I was using the same subnet on both Main and Branch LANs, is that what I'm supposed to do for this type of bridge???

I would appreciate any advice and/or suggestions on how to make this connection work. I am running out of time - management is NOT happy.... Thanks!

 

[spock9458]

I have researched to the max this past weekend, and I am sure that what I need to do is a 'bridge irb', but when I tried it the first time it did not work. When I tried to set the ip address of the bvi1 interface to be on the same subnet as both offices, Cisco won't let me do that. It says the address overlaps with FastEthernet0, so I have to put a different subnet on the bvi?

If that is true, then do I need to establish any static routes in my config, so that bvi can talk to FastEth?

I feel that I'm really close to cracking this problem, it's just that specific questions are hard to get answered sometimes. Please help me if you can.....

Thanks!

 

[Jsteve]

I believe you will need to take off the ip from your f0 interface.

bridge 1 protocol ieee
bridge irb
!
interface FastEthernet0
no ip adress
bridge-group 1
!
interface Serial0
no ip adress
bridge-group 1
!
bridge 1 route ip
!
router rip
version 2
network 192.168.40.0
no auto-summary

int BVI 1
ip address 192.168.40.200 255.255.255.0
-----

Please note* this can not be done remotely, make sure you are infront of the router.