show mac address shows multiple entries

[tpahuja]

Folks,

            When i do show mac-address table for a couple of mac addresses in my network i get multiple entries.

show mac address-table address 0008.e3ff.fd90

  v la n   mac address     type    learn     age              ports

------+----------------+--------+-----+----------+--------------------------

switch 1 Module 1:

*  ---  0008.e3ff.fd90    static  No           -   Router

*  ---  0008.e3ff.fd90    static  No           -   Router

*  ---  0008.e3ff.fd90    static  No           -   Router

*  ---  0008.e3ff.fd90    static  No           -   Router

*  ---  0008.e3ff.fd90    static  No           -   Router

*  ---  0008.e3ff.fd90    static  No           -   Router

*  ---  0008.e3ff.fd90    static  No           -   Router

*  998  0008.e3ff.fd90    static  No           -   Router

*  999  0008.e3ff.fd90    static  No           -   Router

*  210  0008.e3ff.fd90    static  No           -   Router

*  220  0008.e3ff.fd90    static  No           -   Router

*  192  0008.e3ff.fd90    static  No           -   Router

*  200  0008.e3ff.fd90    static  No           -   Router

why is this mac address showing up in multiple v la n s?

[cassiolange]

Hello, 

This is a expect behavior, 0008.e3ff.fd90 is the burned-in MAC address.

This documents explains all about mac-address usage on Catalyst switches.

https://www.cisco.com/c/en/us/support/docs/switches/catalyst-6000-series-switches/41263-catmac-41263.html

Regards,