Hirschmann MACH 1040 Series, User Manual

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Spanning Tree
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4.1 The Spanning Tree Protocol
Redundancy
Release 6.0 07/2010
4.1.2 Bridge parameters
Each bridge is uniquely described by the parameters:
X Bridge Identifier
X
Root Path Cost for the bridge ports,
X Port Identifier
4.1.3 Bridge Identifier
The Bridge Identifier consists of 8 bytes. The 2 highest-value bytes are the
priority. The default setting for the priority number is 32,768, but the
Management Administrator can change this when configuring the network.
The 6 lowest-value bytes of the bridge identifier are the bridge’s MAC
address. The MAC address allows each bridge to have unique bridge
identifiers.
The bridge with the smallest number for the bridge identifier has the highest
priority.
Figure 14: Bridge Identifier, Example (values in hexadecimal notation)
MAC Address Priority
LSB MSB
80
80 00
00 63
51 74 00