Aug 042010

This tutorial will explain How to determine what device mac address is on what port on your Cisco switch.This is very useful when some user want to know if the secific port is connecting to their server/PC.

The Cisco IOS CLI command

The easiest way to see which Ethernet MAC address is on which port is to use the show mac-address-table command.

Here is an example:

switch# show mac-address-table

Mac Address Table

Vlan    Mac Address       Type        Ports
----    -----------       --------    -----
1    0007.e9e2.2d7d    DYNAMIC     Fa0/5
1    0009.0f30.07e9    DYNAMIC     Fa0/48
1    0009.5bbc.af04    DYNAMIC     Fa0/28
1    00e0.bb2c.30d1    DYNAMIC     Gi0/1
1    00e0.bb2c.3e5f    DYNAMIC     Gi0/1

Total Mac Addresses for this criterion: 5

With the command, you can figure out which MAC address is on which port. When you use the command, you have to go to each switch and run the command. If the network is down, you will have to go to the console of each switch.

If you know the switch port you can use the following command

switch# show mac-address-table | i Fa0/5

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 Posted by at 11:22 am

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