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Configure Cisco Router in Bridge Mode

September 7th, 2007 Leave a comment Go to comments

At times when ISP drops an internet connection, it is needed to put the router in bridge mode so that the public ip address can be directly assigned on the inside firewall (any brand).

So you can put a cisco router in bridge mode this way;

bridge 1 protocol ieee

int fa0/0   <–connected to ISP (change interface accordingly)
no ip address
bridge-group 1

int fa0/1  <–connected to ASA (change interface accordingly)
no ip address
bridge-group 1

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  1. Ellen
    October 29th, 2008 at 00:35 | #1
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    Keep up the good work.

  2. NicK Ogilvie
    December 9th, 2008 at 23:05 | #2
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    Hi,

    Will this work if your connection to the ISP is a T1 (or any other non-ethernet encapsulation)?

    Thanks,
    Nick

  3. rsivanandan
    December 10th, 2008 at 07:17 | #3
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  4. TC
    June 23rd, 2009 at 06:14 | #4
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    Will you still be able to use acls in bridge mode?

  5. rsivanandan
    June 23rd, 2009 at 07:36 | #5
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    Yes you should be.

    Cheers,
    Rajesh

  6. Siju
    July 1st, 2009 at 10:53 | #6
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    Thanks man,what is the feasible way to access the router from LAN( through f/w) after youve done bridging.

  7. rsivanandan
    July 1st, 2009 at 11:35 | #7
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    You can always have IRB (Integrated Routing & Bridging and access through that, it provides you access, as well as does the bridging.

    http://www.akadia.com/services/bridged_cisco_router.html

    A quick google search brought me to the above page.

    Cheers,
    Rajesh

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