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Bridging two Cisco 1720s over T1 line

Posted on 2006-10-27
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Last Modified: 2013-12-12
I need to setup a bridge (non-routing) for a single network over a T1 line.  Routers will be two cisco 1720s.

Please post exact config for bridging configuration.  

Can the routers still be assigned an IP on the ethernet interface and do bridging?

Thanks!
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Question by:microfish
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Accepted Solution

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lrmoore earned 1000 total points
ID: 17823351
Yes, you can have an IP address assigned and bridge, but the interface is a Bridged Virtual Interface

bridge 1 protocol ieee
router irb
interface Serial 0
  no ip address
  bridge-group 1
interface fastethernet 0
 no ip address
 bridge-group 1
interface BVI1
  ip address 192.168.168.100 255.255.255.0
ip route 0.0.0.0 0.0.0.0 192.168.168.1

Same config on both sides, different IP on the BVI
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Expert Comment

by:lrmoore
ID: 17823366
Sorry, typing too fast --

 router irb

should be

  bridge irb
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Expert Comment

by:lrmoore
ID: 17830858
Hello?
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Author Comment

by:microfish
ID: 17830893
Thanks!   So router nbr 2 would have the idential configuration, except the ip address would be different (but still in the same network) ??

Thanks,
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Expert Comment

by:lrmoore
ID: 17830908
Exactly..
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Author Comment

by:microfish
ID: 17843688
Well - I think the config is working, but I can not ping or access the router.  Did I miss anything???

Here's my config:
!
version 12.1
no service single-slot-reload-enable
service timestamps debug uptime
service timestamps log uptime
service password-encryption
!
hostname CiscoT1-144.248
!
enable secret 5 xxxx
enable password 7 xxxx
!
!
memory-size iomem 25
ip subnet-zero
!
!
bridge irb
!
interface Serial0
 no ip address
 no fair-queue
 bridge-group 1
 bridge-group 1 spanning-disabled
!
interface FastEthernet0
 no ip address
 speed 100
 full-duplex
 bridge-group 1
 bridge-group 1 spanning-disabled
!
interface BVI1
 ip address 192.168.0.99 255.255.255.0
!
ip classless
ip route 0.0.0.0 0.0.0.0 192.168.0.1
no ip http server
!
!
line con 0
line aux 0
line vty 0 4
 password 7 xxxxxx
 login
!
no scheduler allocate
end
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Expert Comment

by:lrmoore
ID: 17847002
Can you ping the gateway from the router console?
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