pc incredibly slow when inserting network cable (from gigabit switch)

Discussion in 'Cisco' started by tom, Apr 12, 2005.

  1. tom

    tom Guest


    I'm having strange problems with a gigabit switch (extreme summit
    400-48t). symptoms: servers connected to it (mostly sun v20z, also
    v210 & v240 servers) seem to loose network connectivity (i can't reach
    them anymore on the network). then a minute later, everything works
    again as expected.

    the servers are all equipped with gigabit NIC's. (I think the v20z use
    broadcom cards, the sun v210 & v240 use sun's gigaswift ethernet

    another thing that happened the other day was that as soon as i
    inserted a network cable (that was already connected to the switch) in
    my laptop, my pc was behaving extremely slow. as soon as i removed the
    cable, the pc acted normal again.

    I'm using cat FTP 5E cables (gigabit certified).
    I looked in the log on the switch (show log "debug" command), but
    didn't find any errors.

    I was just wondering i any of you have a pointer ?
    the ports on the switch are on 'auto negotiation'. I read somewhere
    that I should probably leave them like that. Perhaps i should fix the
    speed on the NIC on the server ?

    any ideas ?


    tom, Apr 12, 2005
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  2. tom

    Phil Guest

    Is portfast enabled? Sounds like the port is negotiating spanning tree.
    Phil, Apr 13, 2005
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  3. tom

    Gordon Smith Guest

    Extremes don't run spanning-tree by default.

    Firstly, lock the port speed and duplex on both the switch and the servers.
    The OP doesn't say whether any layer 3 functionality is being used, or
    whether its part of an EAPS ring.

    I use Extreme switches extensively and have never had this problem with
    Posting a copy of the config would probably help....
    Gordon Smith, Apr 13, 2005
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