Displaying The Spanning-Tree Status - Cisco 3845 - Security Bundle Router Software Manual
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Displaying the Spanning-Tree Status
You can enable this feature if your switch is running PVST+, rapid PVST+, or MSTP.
Beginning in privileged EXEC mode, follow these steps to enable loop guard. This procedure is optional.
Command
Step 1
show spanning-tree active
or
show spanning-tree mst
Step 2
configure terminal
Step 3
spanning-tree loopguard default
Step 4
end
Step 5
show running-config
Step 6
copy running-config startup-config
To globally disable loop guard, use the no spanning-tree loopguard default global configuration
command. You can override the setting of the no spanning-tree loopguard default global configuration
command by using the spanning-tree guard loop interface configuration command on an NNI.
Displaying the Spanning-Tree Status
Table 15-2
Commands for Displaying the Spanning-Tree Status
Command
show spanning-tree active
show spanning-tree detail
show spanning-tree interface interface-id
show spanning-tree mst interface interface-id
show spanning-tree summary [totals]
You can clear spanning-tree counters by using the clear spanning-tree [interface interface-id]
privileged EXEC command.
For information about other keywords for the show spanning-tree privileged EXEC command, see the
command reference for this release.
Cisco ME 3800X and 3600X Switch Software Configuration Guide
15-10
Chapter 15
Purpose
Verify which interfaces are alternate or root ports.
Enter global configuration mode.
Enable loop guard. By default, loop guard is disabled.
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
Purpose
Displays spanning-tree information on active interfaces only.
Displays a detailed summary of interface information.
Displays spanning-tree information for the specified interface.
Displays MST information for the specified interface.
Displays a summary of interface states or displays the total lines of the
spanning-tree state section.
Configuring Optional Spanning-Tree Features
OL-23400-01
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