Cisco switch port no mac address


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The slot number is from 1 to , and the port number is from 1 to Specifies the EtherChannel interface and EtherChannel number. The range is from 1 to Optional EtherChannel number followed by a dot. Command Default None. Command Modes Global configuration mode.

Command History Release. Go to Solution. As a result and after quite some research, there is not a solid way to "force" a switch learn all mac addresses of its connected hosts. The switch learns the MAC address after the host sends some L2 traffic.

Find switchport for a MAC Address on a Cisco Switch

So, as an example, we should at least know that host's IP address and ping it, so that the switch learns its MAC through the host's echo reply. WoL feature somewhat keeps the PC's network interface into sleep mode rather than powered off. It could be a bug, as I imagine the switch is working properly because the frame between hosts are being exchanged but the mac address table looks empty, is that right?.

I would not say it is a bug yet.

Catalyst 4500 Series Switch Cisco IOS Software Configuration Guide, 12.2(25)EW

I have no idea what hosts are connected to those ports and I cannot tell for sure if they exchange any traffic. Given that the MAC address table is not learning anything, I would expect that they actually do not exchange any traffic at all. Also, I have not tried to reboot the switch yet. If the computers are working properly it could be a bug, you could try rebooting the switch or upgrading the Image, this link could be useful:. However, I am far away from reaching to the conclusion that the MACs are not learnt due to a bug. Let's assume that a host is not chatty at all and sends nothing but DHCP traffic every couple of hours.

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No Mac Address on Switch port - Cisco Community

Please type your message and try again. Could any one here to clarify below ponits: 1. Does every port of a Switch has its own unique MAC address? Thanks in advance. Best Regards, Kevin.

Cisco IOS LAN Switching Command Reference

This content has been marked as final. Show 9 replies. Hope this helps. Hi, Suy and Jornathon, Thank you for both clarify and comfirm.


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  • Am I correct? Best regards, Michel.

    Command Modes

    Hi Michel, I totally agree with you, i found that 's connected to each other learn the mac's of each other connected ports.. Regards, Sameh. Go to original post.