Management Interface not sending a frame.

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Management Interface not sending a frame.

L2 Linker

I have two PaloAlto 850's in HA. I am unable to ping or reach the secondary/standby webgui. Both are connected to the same switch, when looking at the switch CAM table the secondary MGMT interface is not getting populated with the FW MAC address. Being that the switch is not recieving a frame from the FW to populate the CAM table I have tried the following: I have swapped out cables, interfaces on the switch and rebooted the FW multiple times.


Has anyone else ran into this issue or may have a suggestion?



1 accepted solution

Accepted Solutions

L2 Linker

Something got corrupted in the config itself. After reloading a named config file it started working.

View solution in original post


Cyber Elite
Cyber Elite


Just to make sure, both the active and standby PAN's have different management IP's? Do the vlans on the switch match the IP subnets of the PAN's?


The management interface should always have a light and be accessible even if it is the standby HA pair.


Just thinking out loud.



Indeed, both are in the same subnet and VLAN and they both have a different MGMT IP.


I even swaped the cable plugged into the primary and secondary MGMT interface and the issue followed.

Perhaps try a different IP on the same subnet?

Not sure the IP matters at this point. When the interface comes up it should send an ethernet frame to the connected device with its MAC. In this case it appears the FW is not sending that frame to let the switch know the MAC that's connected.

Maybe there is something in the switch logs?

Hi @jmarchant, from the switch perspective can you see that the port is (UP/UP)? Have you tried manually adding the mac address on the switch mac table?

L2 Linker

Something got corrupted in the config itself. After reloading a named config file it started working.

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