Description

Device was not learning any Mac address on some ports

Symptoms

  • MAC addresses are not being learned on the device
  • Traffic forwarding issues due to missing MAC entries

The "show ethernet-switching table " is not showing any entries on the device 

root@> show ethernet-switching table
{master:0}
root@> 

Solution

 

Run the following command to check if any MAC addresses are being learned:

show ethernet-switching table

 

  • Reseat the link: Please, remove the cable, wait for about 5 seconds, and connect it back
  • Bounce the interface: Please, disable the interface, wait for about 5 seconds, and enable it again
  • Restart the L2CPD daemon
  • Power cycle the switch: Please, run the command "request system power-off", wait until it powers off, remove the power cord, wait for about 5 seconds, and power it on
  • Test other port: Let's move the cable to a port that is working and swap it (for example, we wil move the port ge-0/0/0 to port ge-0/0/1 and vice versa). This test will let us know if there is a physical issue with the port

 

In case the issue persists, we should consider zeroize the switch, and then format install it.

 

 

 

Modification History

2025-11-11: POA update for more details

2024-02-18 : Article Created