Quick Reference Guide

Spanning Tree (STP) Commands | 311
Bridge Hold Time—Minimum time between transmission of Configuration Bridge Protocol Data Units
(BPDUs)
CST Regional Root—Bridge Identifier of the common spanning tree regional root. It is derived using the
bridge priority and the base MAC address of the bridge.
Regional Root Path Cost—Path cost to the common spanning tree Regional Root.
Associated FIDs—List of forwarding database identifiers currently associated with this instance.
Associated VLANs—List of VLAN IDs currently associated with this instance.
Example 2
Figure 19-112. Example of Output from show spanning-tree brief Command
When the brief optional keyword is included, this command displays spanning tree settings for the
bridge. In this case, the following details are displayed:
Report Fields Bridge Priority—Specifies the bridge priority for the spanning tree.
Bridge Identifier—The bridge identifier for the selected instance.
Bridge Max Age—Specifies the bridge maximum age for the spanning tree.
Hello Time—Configured value of the parameter for the common spanning tree.
Bridge Forward Delay—Specifies the time spent in “Listening and Learning” mode before forwarding
packets. Bridge Forward Delay must be greater or equal to “(Bridge Max Age/2) + 1”. The time range is
from 4 seconds to 30 seconds. The default value is 15.
Bridge Hold Time—Minimum time between transmission of Configuration Bridge Protocol Data Units
(BPDUs).
show spanning-tree interface
This command displays the settings and parameters for a specific switch port within the common and
internal spanning tree. The unit/slot/port is the desired switch port. The following details are displayed
on execution of the command.
Syntax
show spanning-tree interface unit/slot/port
Mode
Privileged Exec and User Exec
Report Fields Port mode—Enabled or disabled.
Force10#show show spanning-tree brief
Bridge Priority................................ 32768
Bridge Identifier.............................. 80:00:00:01:E8:D5:A2:19
Bridge Max Age................................. 20
Bridge Max Hops................................ 20
Bridge Hello Time.............................. 2
Bridge Forward Delay........................... 15
Bridge Hold Time............................... 3
Related
Commands
spanning-tree hello-time Sets the Admin Hello Time for the selected port in the common and internal
spanning tree.