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Port=1:45: Illegal STP BPDU format 45

Port=1:45: Illegal STP BPDU format 45

New Contributor

We recently installed a new stack of 5420Fs running firmware version and I keep seeing these log messages multiple times a day "<Erro:STP.InBPDU.Drop> Slot-1: Port=1:45: Illegal STP BPDU format 45." I can't really seem to find any documentation online regarding this Illegal STP BPDU format error message, which is why I am here. When I check LLDP neighbors on that port, it looks like there is just a laptop on the other end, I am getting a Microsoft MAC address on the port. Should I configure this port as an edge port? Looks like it is set to auto, but is showing up as a point-to-point port which doesn't seem correct, but maybe it is? Not too familiar with STP on EXOS. 


New Contributor II



It looks like this might be related to the below article:

Not sure if a fix has been released for this yet.


Extreme Employee

That's an interesting one, I would imagine that there is a packet that is being recognized as STP but it isn't STP in reality. I would generally say to set that port as link-type edge if it is not connected to another networking device. Link-type auto should detect the port as edge, but since the switch thinks that it's getting a BPDU, that may be why it's putting it as P2P. That may stop the log messages, but you may need to perform a PCAP on the client machine at the time of the logs to see if you can identify what packet is triggering that message.

Hope that helps!