Deployment Guide

Command History
Version Description
9.9(0.0) Introduced on the FN IOM.
8.3.16.1 Introduced on the MXL 10/40GbE Switch IO Module.
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 Identier...” Lists the bridge priority and the MAC address for this STP bridge.
“Congured 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 ag...” States whether the topology ag and the detected ag 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
• notication
• 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 identier 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.
Example
Dell#show spann 0
Executing IEEE compatible Spanning Tree Protocol
Bridge Identifier has priority 32768, Address 0001.e800.0a56
Configured hello time 2, max age 20, forward delay 15
We are the root of the spanning tree
Current root has priority 32768 address 0001.e800.0a56
Topology change flag set, detected flag set
Number of topology changes 1 last change occurred 0:00:05 ago
from TenGigabitEthernet 1/3
Timers:hold 1, topology change 35
hello 2, max age 20, forward_delay 15
Times:hello 1, topology change 1, notification 0, aging 2
Port 2 (TenGigabitEthernet 1/1) is Forwarding
Port path cost 4, Port priority 8, Port Identifier 8.26
Designated root has priority 32768, address 0001.e800.0a56
Designated bridge has priority 32768, address 0001.e800.0a56
Designated port id is 8.26, designated path cost 0
Spanning Tree Protocol (STP) 1279