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Bridge b/w fasteth and cable subinterfaces ?

Posted on 2004-03-25
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Last Modified: 2010-04-12
Is it possible to setup bridge between fa 0/0.1 and cab 1/0.1 on cisco ubr7114 12.1(11)BC3 realize ?
The goal have to be to extend a vlan (dot1q on fasteth 0/0.1) trough cable modem to the router behind it ?
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Question by:brabard
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Author Comment

by:brabard
ID: 10701899
So , is your answer "No , it's impossible" ?
Cause I know that all the device can be turned into bridge mode , what I need is fa0/0 , fa0/1 and ca1/0 to work in routing mode , but to create something like a bridge between fa0/0.1 and ca1/0.1 , cause fa0/0 is connected to vlan2 and fa0/0.1 is connected to vlan3 trough a wan switch .
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Expert Comment

by:Pascal666
ID: 10702043
It can be done, if you read the document I linked you to it tells you how.

-Pascal
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Author Comment

by:brabard
ID: 10702475
I know that document , cause the first thing I have done was to make search in www.cisco.com .
But , bridge-group is linked to the pfisical interface , otherwise cab 1/0.1 is a virtual interface , so it's in relation with ip routing .
Where is the problem , I have other dhcp pool for a special modem that have to be linked to fa0/0.1 instead of fa0/0 . I am giving the modem ip address from cab1/0.1's network , so that is the onli thing that related that modem to cab1/0.1 .

That's why I am thinking for "something like bridge" , may be virtual-template , but the problem is that the cable modem's eth interface have to be bridget to another interfase trough fa0/0.1->Switch1->Switch2 ... so on .
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Expert Comment

by:Pascal666
ID: 10707202
I bridge to subinterfaces all the time without any problems.

-Pascal
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Author Comment

by:brabard
ID: 10711278
Did you realy understand what I want ?
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Expert Comment

by:Pascal666
ID: 10716724
For example:

bridge crb
interface FastEthernet0/0.1
       bridge-group 1
       bridge-group 1 spanning-disabled
interface Cable1/0.1
       bridge-group 1
       bridge-group 1 subscriber-loop-control
       bridge-group 1 spanning-disabled

-Pascal
     
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Author Comment

by:brabard
ID: 10721614
Ok , I agree the way to do it , the problem is that in conf int cab1/0.1 I can't add no bridge-group , no encapsulation commands ...
What type of platfor and IOS did you try with this configuration ?
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Accepted Solution

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Pascal666 earned 1000 total points
ID: 10726815
I have done this on ethernet and serial subinterfaces on multiple platforms and IOSs, but never on a cable subinterface.  Did you enter the "bridge crb" command before trying to enter the "bridge-group 1"?  You may also want to try "bridge irb" instead.  It may be that cable subinterfaces do not support bridging.  There is another feature that may do what you want, but you would have to upgrade your IOS.

http://www.cisco.com/en/US/products/sw/iosswrel/ps5012/prod_release_note09186a0080080bf2.html#wp308513

-Pascal
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Author Comment

by:brabard
ID: 10997743
Hi ,
I am late with clossing the question , but you are right , I discovered many possibilities and documents and found that cable subinterfaces do not support bridge mode in uBR 71.. 72.. series , only between a single cable slot/controler and a fa subinterface on 72.. series .
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