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Beginner

Status UP, Protocol UP, but MAC Address not found

Hello everyone! I need help. 

Switch: WS-C2960X-48LPS-L, IOS: Version 15.2(4r)E3

Activated on the port:switchport block unicast/multicast, switchport port-security, storm-control broadcast/unicast/multicast, spanning-tree portfast edge, spanning-tree bpduguard enable and dhcp snooping limit rate.

PC is connected to  this the port, on the switch port status is ip and protocol is up, but MAC Address not found in mac address table (show mac add). What could be the problem? Thank you in advance for your help.

Faced one more problem on one of switches. The conditions are the same, only the MAC address of the PC appeared on the root (distribution) switch in the ARP table, but did not appear in the MAC addresses table.

I waited until the end of the CAM's life, but the address did not appear.

 

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Accepted Solutions
Hall of Fame Community Legend

Re: Status UP, Protocol UP, but MAC Address not found

Last input 20w6d, output 00:00:01, output hang never

The downstream client hasn't been "talking" for the last 21 weeks.  

The problem lies at the downstream client.  

Try rebooting it.

View solution in original post

4 REPLIES 4
Hall of Fame Community Legend

Re: Status UP, Protocol UP, but MAC Address not found

Post the complete output to the command "sh interface <PORT> controll".
Beginner

Re: Status UP, Protocol UP, but MAC Address not found

Thank you for your attention to the problem. I attached a file with the output of the command sh int g1/0/15 cont. 

Hall of Fame Community Legend

Re: Status UP, Protocol UP, but MAC Address not found

Last input 20w6d, output 00:00:01, output hang never

The downstream client hasn't been "talking" for the last 21 weeks.  

The problem lies at the downstream client.  

Try rebooting it.

View solution in original post

Highlighted
Beginner

Re: Status UP, Protocol UP, but MAC Address not found

The problem on this switch has been resolved.
However, just now, another one has happened. All functions specified in the first post were activated on the port. When changing the PC to a new one on the access switch, the MAC does not appear on the port, but appears on the kernel switch. As a result, the new connected PC did not have access to the network, after disabling the functions DAI, DHCP Snooping and IP Source Guard, the MAC address appeared and everything started to work.

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