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What is the meaning of these log messages <Erro:STP.InBPDU.Drop> Port=XX: Recv own loop back packet from same port

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TitleWhat is the meaning of these log messages <Erro:STP.InBPDU.Drop> Port=XX: Recv own loop back packet from same port
Question
Why does the switch logs the below error messages.
<Erro:STP.InBPDU.Drop> Port=XX: Recv own loop back packet from same port

 
Environment
  • Exos All
  • BlackDiamond and Summit series switches
  • STP
Answer
Switch with edge-safeguard configuration disables a port if it detects a remote loop.
However, the port on the switch remains in forwarding state when inserting a remote loop and below messages logged.

<Erro:STP.InBPDU.Drop> Port=XX: Recv own loop back packet from same port
 
This log appears when the switch receives its own created packet with different Source mac address in the header on the same port as egress port.


Additional notes
When you find the above log, check the configuration on the downstream devices. For example, Cisco switch examines BPDU packets by default though STP is disabled on the port. 
EXOS switch disables a port if it has a remote loop.
You need to #enable port <#> after terminating the loop to bring it active/forwarding.

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