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6.4 Spanning Tree Commands
This section provides detailed explanation of the spanning tree commands. The commands are divided
into two functional groups:
Show commands display spanning tree settings, statistics, and other information.
Configuration Commands configure features and options of the switch. For every configuration
command there is a show command that displays the configuration setting.
6.4.1 Show Commands
6.4.1.1 show spanning-tree
This command displays spanning tree settings for the common and internal spanning tree. The following
details are displayed.
Default Setting
None
Command Mode
Privileged Exec
Display Message
Bridge Priority: Configured value.
Bridge Identifier: The MAC Address for the Bridge from which the Bridge Identifiers used by the
Spanning Tree Algorithm and Protocol.
Time Since Topology Change: In seconds.
Topology Change Count: Number of times changed.
Topology Change in progress: Boolean value of the Topology Change parameter for the switch
indicating if a topology change is in progress on any port assigned to the common and internal
spanning tree.
Designated Root: The Bridge Identifier of the Root Bridge for the spanning tree instance identified
by the MSTID.
Root Path Cost: Value of the Root Path Cost parameter for the common and internal spanning tree.
Root Port Identifier: The Root Port for the spanning tree instance identified by the MSTID.
Bridge Max Age: Maximum message age.
Bridge Max Hops: The maximum number of hops for the spanning tree.
Max Tx Hold Count: The max value of bridge tx hold count for the spanning tree.
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