Administrator Guide

Version Description
8.4.2.1 Added support for the optional guard keyword on the C-Series, S-Series, and E-
Series TeraScale.
8.3.7.0 Introduced on the S4810.
7.7.1.0 Introduced on the S-Series.
7.5.1.0 Introduced on the C-Series.
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.
The following describes the show spanning-tree 0 guard command shown in the Example
(Guard).
Field
Description
Interface Name STP interface.
Instance STP 0 instance.
Sts Port state: root-inconsistent (INCON Root), forwarding (FWD), listening (LIS),
blocking (BLK), or shut down (EDS Shut).
Guard Type Type of STP guard configured (Root, Loop, or BPDU guard).
The peGigE ports and VP-LAG ports information is displayed as part of theshow spanning-tree 0
command output, only when the guard option is entered.
1672
Spanning Tree Protocol (STP)