How to configure a "mirrored" or "spanned" port

Discussion in 'Technology' started by goroso1, Jun 6, 2006.

  1. goroso1

    goroso1 New Member

    Can anyone help me this ,how to configure a "mirrored" or "spanned" port

    Thanks :-o

  2. Thermal

    Thermal Registered Member

    Is this for monitoring purposes on a switch?

    The basic concept is that frames can only be forwarded out a port according to the Hardware address table. The exception is that a frame is forwarded out of every port excepting the one it received the frame on when the destination hardware address is not in the table. This makes monitoring network traffic difficult. In order to monitor with a switch, you'll need to create a SPAN session that tells the switch to forward a copy to your computer.

    The following will setup port 1 on a Cisco Switch to monitor Fa0/4:
    interface Fa0/1
        port monitor Fa0
    You can also setup a port (Fa0/1 in this case) to forward data destined to a particular VLAN (VLAN2 here):
    interface Fa0/1
        port monitor vlan2
    Hope this helps.
    Last edited: Jun 6, 2006
  3. goroso1

    goroso1 New Member

    thanks for your help.

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