BPDU mac address are not in the table? ???

CCIE_2011CCIE_2011 Member Posts: 134
in CCNP
Hi all ....
i was setting up a lab here a while ago, to practice some spanning tree commands. type show span
and the root address is 0018.X.X. i took address and try to find out where it is coming from? which port? I typed show mac-add address 0018.X.X and i no entry for this address? ????
(PS:I know you can find root port with the same show span).
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Comments

  • NetstudentNetstudent Member Posts: 1,693 ■■■□□□□□□□
    Did you search for 01-80-C2-00-00-00? If so, then that is the multicast address. If you did indeed search for the MAC of the root bridge, then I would think it has to be in there somewhere.
    There is no place like 127.0.0.1 BUT 209.62.5.3 is my 127.0.0.1 away from 127.0.0.1!
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  • dtlokeedtlokee Member Posts: 2,378 ■■■■□□□□□□
    They are there but the switch offsets the MAC address taht it uses to send the BPDUs by the interface # so if the base mac address is 0010.ABCD.0080 and you're connected to port 1 the source MAC of the port 0010.ABCD.0081 and port 11 woud be 0010.ABCD.008B.
    The only easy day was yesterday!
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  • CCIE_2011CCIE_2011 Member Posts: 134
    dtlokee wrote:
    They are there but the switch offsets the MAC address taht it uses to send the BPDUs by the interface # so if the base mac address is 0010.ABCD.0080 and you're connected to port 1 the source MAC of the port 0010.ABCD.0081 and port 11 woud be 0010.ABCD.008B.

    Thanks alot .... you are totally true :)
    . : | : . : | : .
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  • Aquabat [banned]Aquabat [banned] Inactive Imported Users Posts: 299
    what's ur name? is 2011 the year you want to get your ccie?
    i herd u leik mudkips lol
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  • cisco_troopercisco_trooper Member Posts: 1,441 ■■■■□□□□□□
    CCIE_2011 wrote:
    dtlokee wrote:
    They are there but the switch offsets the MAC address taht it uses to send the BPDUs by the interface # so if the base mac address is 0010.ABCD.0080 and you're connected to port 1 the source MAC of the port 0010.ABCD.0081 and port 11 woud be 0010.ABCD.008B.

    Thanks alot .... you are totally true :)

    Yea, he got his CCIE number so now he thinks he knows everything.... icon_wink.gif
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  • darkuserdarkuser Member Posts: 620 ■■■□□□□□□□
    http://www.cisco.com/univercd/cc/td/doc/product/rtrmgmt/sw_ntman/cwsimain/cwsi2/cwsiug2/vlan2/stpapp.htm
    rm -rf /
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