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Bridge b/w fasteth and cable subinterfaces ?

brabard
brabard asked
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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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Author

Commented:
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 .
It can be done, if you read the document I linked you to it tells you how.

-Pascal

Author

Commented:
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 .
I bridge to subinterfaces all the time without any problems.

-Pascal

Author

Commented:
Did you realy understand what I want ?
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
     

Author

Commented:
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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Author

Commented:
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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