mac address

Unanswered Question
Sep 10th, 2007
User Badges:

Hi all,

It may stupid question to all, why we should clear mac-address on particular switch-port, what is the use and advantage by clear mac-address.

Thanks in advance,


  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 4 (1 ratings)
Jon Marshall Mon, 09/10/2007 - 01:38
User Badges:
  • Super Blue, 32500 points or more
  • Hall of Fame,

    Founding Member

  • Cisco Designated VIP,

    2017 LAN, WAN

Hi Naidu

Not a stupid question at all. There are times when it is very useful to be able to clear the mac-address mapped to a switchport for example if you remove a device from a switchport and insert another device which uses a different mac-address. You can wait for the mac-address to age out but sometimes it is more efficient to remove the old mac-address straight away.



ilnaiduccna Mon, 09/10/2007 - 02:00
User Badges:

Hi Jon,

Thanks 4 ur early reply,

One more reservation that each switch port have its own mac-address am i right / not? so when we connect one device in one switch-port then there will be 2 mac-address club then what? 2 mac-address will work?


abbas.wasim Tue, 09/11/2007 - 04:25
User Badges:

Well Switches are designed in 2 ways.

On switches each port may have its own mac-address


every port share the same mac address they way L2 switch IP does.

But I've seen most of Cisco switches are configured with diffrent mac-addresses for every port.



ilnaiduccna Tue, 09/11/2007 - 22:44
User Badges:

Hi Abbas,

Good diverse thanks,

What you mean by that different mac-addresses for every port can u tell briefly so that I can get clear.


abbas.wasim Wed, 09/12/2007 - 00:54
User Badges:

Well I mean every port has its own mac-address rather they share the same mac-address

guruprasadr Tue, 09/11/2007 - 23:18
User Badges:
  • Gold, 750 points or more

HI Naidu,

Not each Switch Port will have one MAC Address whereas Switch will have the one MAC Address.

You can Bind the MAC Address to the Switch Port using Port Security Feature in Cisco.

So at any point of time, Switch will have the Only one MAC Address as Hardware ID for it and Connected Devices to the Switch Port will have the MAC Address Binded to it logically.

Hope this Helps


Best Regards,

Guru Prasad R

ilnaiduccna Wed, 09/12/2007 - 00:52
User Badges:

Hi Guru Prasad,

You mean all mac-address club in to single mac address.

You told that we can Bind the MAC Address to the Switch Port using Port Security Feature in Cisco can you tell how we can Bind the MAC Address.

Can you explain briefly about Bind Mac Address, Port Security Feature.




This Discussion