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BPDU
Last modified: Monday, December 11, 2000 

Acronym for bridge protocol data unit. BPDUs are data messages that are exchanged across the switches within an extended LAN that uses a spanning tree protocol topology. BPDU packets contain information on ports, addresses, priorities and costs and ensure that the data ends up where it was intended to go. BPDU messages are exchanged across bridges to detect loops in a network topology. The loops are then removed by shutting down selected bridge interfaces and placing redundant switch ports in a backup, or blocked, state.

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Related Links

Understanding Spanning Tree Protocol 
Cisco Systems provides this technically heavy analysis of how spanning tree protocol operates.

related categories

Data

Data Structures

Network Protocols

Programming

related terms

binary tree

branch

data structure

digital access and cross-connect system (DACS)

directory

hierarchical

leaf

STP

switch

tree structure


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