Find the port connected to device B in Nexus7K

[wfqk]

Hi, devices B is connected to Nexus7K. After we logon to Nexus7K, based on the output of show ip arp and show mac address-table, we can know Device B is connected to Nexus7K via vlan 100, but vlan 100 have several ports on Nexus7K. How can we know which port in Nexus7K is connected to Device B. Thank you

[Deepak Kumar]

hi,

if you connected device supporting to cdp protocol then use "show cdp neighbor detail"

you will get details about connected device.

if your connected device not supporting to cdp then try with LLDP protocol. You must be enable lldp on Cisco switch.

show lldp neighbor detail

regards,

deepak Kumar

please vote if this will helpful for you.

sorry for typo.. I am using phone.

[wfqk]

Thank you so much for your reply. The device is non-Cisco device. and at this moment, we cannot enable LLDP. 

[Deepak Kumar]

Then you have the only option as you are doing with mac address table "sho mac address-table address 00:00:00:00:00:00" or configure IP reservation for the devices on DHCP server.

Regards,
Deepak Kumar

[Richard Burts]

With show mac address table there is an option to show a particular mac address. That should provide the port number where that particular mac address is connected.

HTH

Rick

[wfqk]

After I got mac add by show ip arp, I use command show mac address-table. then i got output like the below in Nexus7K: 

N7K-2# sh mac address-table | i 001c.1111.2222
100    001c.1111.2222   dynamic ~~~ F F vPC Peer-Link

100 is vlan number

Thank you

[Richard Burts · Accepted solution]

So the mac is learned via the vpc peer link. Go to the peer switch and try the command. And you might try the option of show mac-address-table mac-address 001c.1111.2222

HTH

Rick

[wfqk]

You are right. Thank you!

[Richard Burts]

You are welcome. I am glad that my suggestions pointed you in the right direction. Thank you for marking this question as solved. This will help other readers in the forum to identify discussions which have helpful information.

HTH

Rick