trace mac-address

Unanswered Question
Jan 3rd, 2008
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Hi all,

By using mac-address we can trace the IP address of the particular switch port, like that is there any way to trace mac-address & connected switch port with IP address.

It would be appreciated.



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Jon Marshall Thu, 01/03/2008 - 23:49
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If you have just an IP address you need to go onto the device that has the layer 3 interface for the subnet of that ip address and look at the arp table eg.

PC = vlan10

Lgo onto the switch with the vlan 10 L3 interface on it and run

"sh arp | include"

This will give you the mac-address of the PC. You can then run

sh mac-address-table address "xxxx.xxxx.xxxx" (IOS)


sh cam xx-xx-xx-xx-xx-xx (Catos)

Note that the above command(s) may well return a port that is connected to anothe switch (most likely a trunk). You would then need to log onto the switch at the other end of the link and run the mac-address commands again.



ilnaiduccna Fri, 01/04/2008 - 02:07
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Hi Jon,

Thanks for your early reply.

I tried both commands and worked out.




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