Random mac address assigned voor BVI ?

Discussion in 'Cisco' started by Ronald de Leeuw, Oct 5, 2004.

  1. When my BVI interface comes up I get the following :

    Mar 1 01:21:54.267:
    Note: A random mac address of 0000.0cf6.0dc4
    has been chosen for BVI in bridge group 10 since there is no mac
    associated with the selected interface.
    Mar 1 01:21:54.271:
    Ensure that this address is unique.

    Mar 1 01:22:05.244:
    Note: A random Spanning Tree Bridge Identifier address of 0000.0cee.38a4
    has been chosen for Bridge Group 10 since there is no mac address
    associated with the selected interface.
    Mar 1 01:22:05.244:
    Ensure that this address is unique.

    How do I configure this mac address and spanning tree bridge identifier
    static in my router?

    Ronald de Leeuw
    Ronald de Leeuw, Oct 5, 2004
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  2. Ronald,
    I am not sure if the mac-address and spanning tree bridge identifier can
    be hardcoded on a BVI. My question, out of curiousity, is why would you want

    It is my understanding that the BVI is going to borrow a mac address from
    one of the interfaces in the bridge group, which would make sense since you
    want the bridge group to be "seen" at layer 2 i.e. have a mac that is valid
    in the CAM. Also, it is my understanding that from a spanning-tree
    perspective the BVI will have it's own instance of spanning-tree much like a
    VLAN does so I do not see the utility in hardcoding the bridge identifier

    Maybe clarifying what you are trying to accomplish will help the group
    provide an acceptable solution?

    Good Luck
    Robert B. Phillips, II, Oct 6, 2004
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  3. Ronald de Leeuw

    Ivan Ostreš Guest

    Let's see how does it work:

    RouterB#conf t
    Enter configuration commands, one per line. End with CNTL/Z.
    RouterB(config)#bridge irb
    RouterB(config)#int eth0/0
    RouterB(config-if)#bridge-group 1
    RouterB(config-if)#int bvi 1
    RouterB(config-if)#mac-address ?
    H.H.H MAC address

    RouterB(config-if)#mac-address 00aa.00bb.00cc
    RouterB#sh int bvi 1 | incl Hardw

    Hardware is BVI, address is 00aa.00bb.00cc (bia 0000.0000.0000)


    Seems it's possible to add a MAC address to BVI and looks ok..
    Ivan Ostreš, Oct 6, 2004
  4. Ronald de Leeuw

    Hansang Bae Guest

    Because BVI is full of bugs if you don't hardcode MACs. Well, to be
    fair, I should say that 8540's implementation of BVIs is faulty at best.



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    Hansang Bae, Oct 6, 2004
  5. Ah, I don't have that much experience with BVI outside of xDSL PPPoA
    configs, so I was not aware. Thanks...
    Robert B. Phillips, II, Oct 9, 2004
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