10-17-2004 10:51 AM - edited 03-02-2019 07:19 PM
hi , please help me in following senario
we have a private leased line and i want to configure the two routers for bridging, if i enable on bridging on serial int , the serial int shutsdown.if u can please tell me what are the commands to enable bridging
eg router 1 e0 207.132.222.105 255.255.255.224
s0 207.132.222.106 255.255.255.224
router2 e0 207.132.222.104 255.255.255.224
s0 207.132.222.103 255.255.255.224
10-17-2004 11:03 AM
If you want to do remote transparent bridging over a serial link, you don't need to configure any IP addresses at all. You can bridge the layer-2 directly. Here is a document that tells you how to do it, with some great configuration examples:
http://www.cisco.com/warp/public/701/37.html
There is even a bit about IRB, which is the technique to use if you want to route packets into and out of the bridged LAN.
Kevin Dorrell
Luxembourg
10-18-2004 02:10 AM
i have configured bridging on both the routers but still i am not able to ping from one network to the other network
e0 is up , s0 is also up on both routers
10-18-2004 02:13 AM
Could you post the configs of both your routers please?
Thanks
Kevin Dorrell
Luxembourg
10-18-2004 02:14 AM
Could you post the configs of both your routers please?
Thanks
Kevin Dorrell
Luxembourg
10-18-2004 02:28 AM
router 1
!
!
hostname xxx
!
boot-start-marker
boot-end-marker
!
no logging on
enable secret xxxxx
!
no aaa new-model
ip subnet-zero
!
!
!
!
ip cef
no scripting tcl init
no scripting tcl encdir
!
!
!
!
interface FastEthernet0
no ip address
speed auto
bridge-group 1
!
interface Serial0
description connected to Bahrain
bandwidth 128
no fair-queue
bridge-group 1
!
ip classless
no ip http server
!
!
!
control-plane
!
bridge 1 protocol ieee
!
router2
!
!
hostname xxx
!
boot-start-marker
boot-end-marker
!
no logging on
enable secret xxxx
!
no aaa new-model
ip subnet-zero
!
!
!
!
ip cef
no scripting tcl init
no scripting tcl encdir
!
!
!
!
interface FastEthernet0
no ip address
speed auto
bridge-group 1
!
interface Serial0
description connected to Bahrain
bandwidth 128
bridge-group 1
!
ip classless
no ip http server
!
!
!
!
bridge 1 protocol ieee
!
10-18-2004 03:27 AM
If you do not want to configuring routing and bridging simultaneously then turn routing off on the router by using the command 'no ip routing'. If you want routing functionality in addition to the capability to bridge ip then use IRB as recommended earlier.
10-18-2004 03:29 AM
OK Savio, I don't see anything wrong with that. It seems to be practically identical to the example in the document I sent you, so I cannot work out what is wrong.
Please could you do a show int S0, a show bridge verbose, and a show arp on each router? Perhaps that will give us a clue.
Kevin Dorrell
Luxembourg
10-18-2004 04:43 AM
I am pretty sure the problem lies in the fact that he is trying to bridge IP while the router is trying to route it. By default ip routing is enabled and unless you explicitly turn it off or use another bridging mechanism like IRB or older CRB, you will not be able to bridge the IP traffic. Other non routable protocols will be bridged but IP will be routed by default. Like i suggested earlier turn routing off and then see if you can ping the remote ip address.
10-18-2004 05:34 AM
Atif,
Out of curiosity:
If he does bridge irb will the bridge start working even if he does not have any bvi interfaces yet to connect the bridge to the router?
Also, will it be bridging IPX/AppleTalk/DecNet/etc already? Is it just IP that is excluded from the bridge at the moment? Or is any bridging mutually exclusive with ip routing unless you have CRB or IRB?
Kevin Dorrell
Luxembourg
10-18-2004 05:49 AM
Bridging should work without having to configure the associated BVI interface (provided he enters the bridge irb command like you mentioned).
When you configure bridge irb then everything is bridged within the bridge group by default. Routing for IP will need to be configured explicitly using the brige
To answer your second question yes i believe everything other than IP is bridged by default and does not require ip routing to be turned off to function properly.
10-19-2004 04:51 AM
thankyou kevin
after entering bridge irb it started working
11-15-2012 11:04 AM
Anything stopping to from working if the interfaces are dot1q subinterfaces?
11-15-2012 11:43 AM
8 years old thread - Please open new threads for new problems.
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