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I want to know what is the EtherType field of a BPDU frame in various versions and variants of the Spanning Tree Protocol.

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    A quick Google search would give you the answer.
    – Ron Trunk
    Apr 4, 2018 at 10:58

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There is no Ethertype for Spanning-Tree protocol BPDUs - they are encapsulated in 802.3 Ethernet (rather than Ethernet II), and so the Ethertype field does not exist.

See What is the difference between Ethernet II and 802.3 Ethernet? for more information

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