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Community Member

switch mac adress

hi,

I have a doubt about switch mac address; either swiych has a mac address or each port has mac address??

9 REPLIES
Community Member

Re: switch mac adress

I have attached a snapshot taken from packet tracer, in that each port has mac address

but all the vlans share the same mac... i dont understand this

Cisco Employee

switch mac adress

Hi Vishal,

what you see is expected. vlans share mac addresses (to save resources) as every mac address has to be unique within  every vlan

Riccardo

Community Member

Re: switch mac adress

vlan's mac address is virtual mac or physically present on a switch??

Cisco Employee

Re: switch mac adress

It is virtual but it is derived from the physical "Base ethernet MAC Address" of the switch that you can see in show version

Base ethernet MAC Address       : 00:24:50:43:C7:00

lan-3750-1#sh int vlan 1

  Hardware is EtherSVI, address is 0024.5043.c740 (bia 0024.5043.c740)

Riccardo

Community Member

Re: switch mac adress

The switch knows what traffic belongs to which VLAN even though it is using the same MAC on each vlan as it tags the traffic so that fact that it uses the same MAC is fine . As Riccardo said it saves resources  .

Community Member

Re: switch mac adress

thank u very much!!!

address is 0024.5043.c740 (bia 0024.5043.c740)

what does bia mean?

switch mac adress

Burned In Address.

Community Member

Re: switch mac adress

BIA stands for "Burned In Address" So its basically saying that is the vendor assigned MAC address of your device...at least that is what I belive it to mean

Regards

Community Member

Re: switch mac adress

Thank you james

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