Cisco 1721 Fast Ethernet Port unstable

Discussion in 'Cisco' started by ITCOM, Apr 23, 2007.

  1. ITCOM

    ITCOM Guest

    We have a problems. our router 1721 Fast Ethernet port unstable not work.
    The port status always show up , but cannot connect to network. We need
    restart Fast Ethernet mobule , after work on normaly. Because this router
    managed by ISP provide.The ISP engineer say the siwtch problems. I have
    replace the cable connect to siwtch,. I want to know error is switch or
    router. please advice.

    ITCOM, Apr 23, 2007
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  2. ITCOM

    J.Cottingim Guest

    Ok... This is a WILD guess - Check that the duplex of the switch. The
    duplex and speed of the switch MUST match the duplex and speed of the
    router. You can verify if you have the correct duplex by checking the
    error counters on your switch port. If you have more than just a very
    few errors, it's most likely wrong.
    In that case, you'll need to check with your ISP and match yours to

    Does the switch show the router is connected?
    Send the output of the "show interface" for the interface in question.

    J.Cottingim, Apr 23, 2007
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