STP port state question

borumasborumas Posts: 244Member
I remember a question on what port states does a switch port learn mac addresses? Am I right in thinking it learns them only in learning and forwarding modes? From the info I've read that seems to be the case but I thought I had once read that while blocking a port that it still receives bpdu's, does it also possibly learn macs in this state also?

Comments

  • EdTheLadEdTheLad Posts: 2,112Member
    Yes you are correct, only learns in learning and forwarding mode.
    Networking, sometimes i love it, mostly i hate it.Its all about the $$$$
  • NetstudentNetstudent Posts: 1,694Member
    yes and blocking states do listen for BPDU's but they don't build cam tables in blocking. If you review a BPDU frame format and the source and destination MAC fields, you will see that these are MAC's of the swithes themselves. The base macs. I don't think these MACs are used in normal frame forwarding decisions, so therefore blocking states do not learn.

    http://www.cisco.com/univercd/cc/td/doc/product/lan/trsrb2/frames.htm#xtocid2301355
    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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