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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.
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