Author(s) Olivier Bonaventure
Deadline No deadline
Submission limit No limitation
Category tags Ethernet


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Comparing BPDUs

With the 802.1d protocol, Ethernet switches exchange BPDUs that contain four informations :

  • the Root identifier
  • the Cost to reach the root
  • the Transmitter identifier

The third information contains two parts: the identifier of the switch that sent the BPDU and the identifier of the port where the BPDU has been sent. Each switch uses a unique identifier for each of its ports.

Which BPDUs are better
Select among the list below all the BPDUs that are better than [R=123,C=17,T=15.4]