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Sun, Jun 19, 2016 10:44 pm

Determining the port to which a system is connected by MAC address

If you need to know the port on a Cisco switch to which a particular host is connected and know the media access control (MAC) address, you can determine the port to which it connects using a show mac address-table address command. You can view all of the entries in the MAC address table with the command show mac address-table, but if you know the MAC address of the relevant system and only wish to determine the port on the switch to which it connects, you can specify its MAC address with the command show mac address-table address followed by the 48-bit MAC address, which can be in the form xx.xx.xx.xx.xx.xx or xxxx.xxxx.xxxx .
Saturn>show mac address-table address 50:e5:49:d8:13:37
          Mac Address Table
-------------------------------------------

Vlan    Mac Address       Type        Ports
----    -----------       --------    -----
   1    50e5.49d8.1337    DYNAMIC     Fa0/19
Total Mac Addresses for this criterion: 1
Saturn>

With the port number, you can determine details for the interface to which the system connects using a show interfaces port where port is the port identified by the show mac address-table address command.

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