Find out an IP from MAC address on CAtalyst 2950.

Hi all,

how to see which IP address does correspond to a particular MAC address? My catalyst runs 12.1(22)EA4.



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sho arp

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Brian V

For an attached workstation, here is what I do:

  1. sh mac-adress table int f0/x ,where x is the port number.
  2. log into the default gatway router
3 sh ip arp xxxx.xxxx.xxxx , where xxxx.xxxx.xxxx is the MAC address

If you have the MAC already, skip #1.

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Ping it, do a show arp, then do a show mac-address-table | incl [mac-address] and you will find out which port it is on.


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