Administrator Guide

Version 8.4.2.1 Added support for the optional guard keyword on the C-
Series, S-Series, and E-Series TeraScale.
Version 8.3.7.0 Introduced on the S4810.
Version 7.7.1.0 Introduced on the S-Series.
Version 7.5.1.0 Introduced on the C-Series.
pre-Version
6.2.1.1
Introduced on the E-Series.
Usage
Information
Enable spanning tree group 0 prior to using this command.
The following describes the show spanning-tree 0 command shown in the
example.
Field Description
“Bridge
Identifier...”
Lists the bridge priority and the MAC address for this STP
bridge.
“Configured
hello...”
Displays the settings for hello time, max age, and forward
delay.
“We are...” States whether this bridge is the root bridge for the STG.
“Current root...” Lists the bridge priority and MAC address for the root bridge.
“Topology flag...” States whether the topology flag and the detected flag were
set.
“Number of...” Displays the number of topology changes, the time of the
last topology change, and on what interface the topology
change occurred.
“Timers” Lists the values for the following bridge timers: hold time,
topology change, hello time, max age, and forward delay.
“Times” List the number of seconds since the last:
• hello time
• topology change
• notification
• aging
“Port 1...” Displays the Interface type slot/port information and the
status of the interface (Disabled or Enabled).
“Port path...” Displays the path cost, priority, and identifier for the
interface.
“Designated
root...”
Displays the priority and MAC address of the root bridge of
the STG that the interface belongs.
“Designated
port...”
Displays the designated port ID.
Spanning Tree Protocol (STP)
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