The STP BPDU begins with the protocol id field and the version id. I understand that the version is the type of the STP:
0 stands for STP,
2 for RSTP
and 3 for MSTP.
So what do we really need the protocol id field for? When will it not be 0?
STP - protocol id in bpdu
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0 packet identifier is for IEEE 802.1D
Packet identifier should be 1 in IEEE 802.1G