It has been suggested that this article be merged into Spanning Tree Protocol#Bridge protocol data units. (Discuss) Proposed since August 2023.

Bridge Protocol Data Units (BPDUs) are frames that contain information about the spanning tree protocol (STP). A switch sends BPDUs using a unique source MAC address from its origin port to a multicast address with destination MAC (01:80:C2:00:00:00,[1] or 01:00:0C:CC:CC:CD for Cisco proprietary Per VLAN Spanning Tree).[2]

There are two kinds of BPDUs for 802.1D Spanning Tree:[3]

By default the BPDUs are sent every 2 seconds.

References

  1. ^ Finn, Norman. "Provider Bridge Layer 2 Protocols" (PDF). IEEE 802 LAN/MAN Standards Committee. Retrieved 20 October 2017.
  2. ^ "Understanding Rapid Spanning Tree Protocol (802.1w)" (HTML). Cisco Systems. 1 August 2017. Retrieved 20 March 2020.
  3. ^ IEEE Computer Society. IEEE Standard for Local and metropolitan area networks: Media Access Control (MAC) Bridges. doi:10.1109/IEEESTD.2004.94569. ISBN 978-0-7381-3982-1. Retrieved 20 March 2020.
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