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3 mac addresses on one interface+

girish_p1
Beginner
Beginner

Hi, Can anyone help me to understand that I have a switch port connected with an IP Phone and a PC but it is showing 3 mac addresses on this port. Phone is in voice vlan 30 and port is in vlan 10 but I see two mac addresses on vlan 10 and one on vlan 30 on this interface when i run sh mac-add-table inter <current>. 

Can anyone explain that ? Thanks in advance.

4 Replies 4

omz
Collaborator
Collaborator

Hi, 

Lookup the mac address to find out the vendor. That might help.

 

https://macvendors.com/

 

Any other NIC on the PC? Wireless or Virtual?

sbhadrav@cisco.com
Contributor
Contributor

Provides the output for ports G1/0/10 thru 19:

sh mac address-table | include Gi1/0/([1][0-9])

Provides the outputs for G1/0/20 thru 39:

sh mac address-table | include Gi1/0/([2-3][0-9])

thilinar8
Beginner
Beginner

can you share the switch port config?

 

is phone MAC address shown in both VLANs?

Are you sure no one has connected a switch to the interface?

 

Martin

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