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Telindus 1031 Router
Chapter 8
User manual
145
8.6
The Spanning Tree Bridge Protocol Data Unit
What is a BPDU?
To establish a stable path, each bridge sends Configuration Bridge Protocol Data Units (BPDUs) to its
neighbouring bridges. These Configuration BPDU messages contain information about the spanning
tree topology. The contents of these frames only changes when the bridged network topology changes
or has not been established.
Each Configuration BPDU contains the following minimal information:
• The unique bridge identifier of the bridge that the transmitting bridge believes to be the root bridge.
• The cost of the path to the root from the transmitting port.
• The unique port identifier of the transmitting port.
When a bridge transmits a BPDU frame, all bridges connected to the LAN on which the frame is trans-
mitted receive the BPDU. When a bridge receives a BPDU, it does not forward the frame. Instead, it uses
the information in the frame to:
• calculate a BPDU,
• initiate a BPDU transmission if the topology changes.
The propagation of Configuration BDPUs
When a bridged network is in a stable condition, switches continue to send Configuration BPDUs to its
neighbouring bridges at regular intervals. Configuration BPDUs are transmitted down the spanning tree
from designated ports to root ports. If a Configuration BPDU is not received by the root port of a bridge
within a predefined time interval (for example, because a bridge along the path has dropped out), the
port enters the listening state to re-determine a stable path.
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Страница 38: ...Telindus 1031 Router Chapter 2 User manual Installing and connecting the Telindus 1031 Router 28 ...
Страница 80: ...Telindus 1031 Router Chapter 5 User manual Basic configuration 70 ...
Страница 168: ...Telindus 1031 Router Chapter 8 User manual Configuring the bridge 158 ...
Страница 179: ...Telindus 1031 Router Reference manual 169 Reference manual ...
Страница 180: ...Telindus 1031 Router Reference manual 170 ...
Страница 308: ...Telindus 1031 Router Chapter 11 Reference manual Status attributes 298 ...
Страница 336: ...Telindus 1031 Router Chapter 12 Reference manual Performance attributes 326 ...
Страница 348: ...Telindus 1031 Router Chapter 13 Reference manual Alarm attributes 338 ...
Страница 362: ...Telindus 1031 Router Chapter 15 Reference manual Auto installing the Telindus 1031 Router 352 ...
Страница 370: ...Telindus 1031 Router Chapter 16 Reference manual Downloading software 360 ...
Страница 380: ...Telindus 1031 Router Chapter 17 Reference manual Technical specifications 370 ...
Страница 381: ...Telindus 1031 Router Annex 371 Annex ...
Страница 382: ...Telindus 1031 Router Annex 372 ...
Страница 384: ...Telindus 1031 Router Annex A Annex common TCP and UDP numbers 374 ...
Страница 386: ...Telindus 1031 Router Annex B Annex product information 376 ...
Страница 394: ...Telindus 1031 Router Index Annex 384 ...