Cisco 2611 and BGP

Discussion in 'Cisco' started by Larry Smith, Apr 26, 2005.

  1. Larry Smith

    Larry Smith Guest

    Ok, I have my nomex on...
    I have a customer with a Cisco 2611, 32meg
    memory, 16mb flash, one T1 W1C, one ADSL W1C.

    Customer wants to multi-home using two frame
    connections (one frame-T1, two dlci, two remote
    locations) and the dsl as a "backup" to the frame.

    Remote routers are all Cisco 7206vxr.

    Question I have, is can (and hopefully suggestions
    on how best) this router support BGP with only a
    default route from each remote (the two frame end
    points and the DSL endpoint 7206s). Something like
    the:
    ip prefix-list ABC seq 5 permit 0.0.0.0/0
    shown in the cisco docs under sample configs for
    multihoming where only a default route is required
    (not full or even partial tables)...

    Thanks,

    Larry Smith
    lesmith (at) ecsis.net
     
    Larry Smith, Apr 26, 2005
    #1
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  2. Yes, yes, and yes.

    Now for the challenges:

    * Load balancing is not automatic between the two DLCI's. You'll
    need to do some work. Google is your friend, as is the FAQ.

    * The chances of losing one DLCI and not the other is a lot lower
    than logic would say it should be.

    * The DSL backup will be tricky, but not impossible if you need to
    NAT to use it.

    * The DSL backup will be impossible if you need to use NAT on both
    frame and DSL.

    * 26xx IOS 12.3 base IP does NOT support BGP. You will need to
    downgrade to IOS 12.2 or upgrade to as 12.3 feature set which
    does include BGP.

    * This does not protect you from a frame link with high BER. But
    then, nothing does :-(

    Good luck and have fun!
     
    Vincent C Jones, Apr 26, 2005
    #2
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  3. Larry,

    Why not build a VPN with a higher metric route over the DSL line for your
    backup link. This way either side can initiate the connection and you don't
    have to deal with the hassles of BGP.

    -Richard
     
    Richard Graves, Apr 27, 2005
    #3
  4. Larry Smith

    Larry Smith Guest

    Richard,

    Yes, that will work for the DSL backup, but what about
    the two frames (that connect to different cities/routers)?

    Larry Smith
    lesmith (at) ecsis.net
     
    Larry Smith, Apr 27, 2005
    #4
  5. Larry Smith

    Larry Smith Guest

    Thanks,

    As for challenges, NAT is not requried (or desired)
    on any; current IOS does support BGP (at least the
    commands are there) and load balancing is not required.
    Plan old routing.

    EG: DLCI to City A as primary
    DLCI to City B as secondary
    DSL as frame "fail-over".

    Larry Smith
    lesmith (at) ecsis.net
     
    Larry Smith, Apr 27, 2005
    #5

  6. Larry,

    You want to load balance/fail-over the two PVCs? You could build a PPP
    multilink group to accomplish this, and its still simplier than using BGP,
    in my opinion.

    -Richard
     
    Richard Graves, Apr 27, 2005
    #6
  7. Larry Smith

    Larry Smith Guest

    Richard,

    As mentioned earlier in this thread, load balancing
    is not required. Plan old routing.

    EG: DLCI to City A as primary
    DLCI to City B as secondary
    DSL as frame "fail-over".

    Larry Smith
    lesmith (at) ecsis.net
     
    Larry Smith, Apr 27, 2005
    #7
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