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Dell PowerEdge FN I/O Module Command Line Reference Guide 9.10(0.0)

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show spanning-tree 0

Display the spanning tree group configuration and status of interfaces in the spanning tree group.

Syntax show spanning-tree 0 [active | brief | guard | interface interface | root | summary]
Parameters
0 Enter 0 (zero) to display information about that specific spanning tree group.
active (OPTIONAL) Enter the keyword active to display only active interfaces in spanning tree group 0.
brief (OPTIONAL) Enter the keyword brief to display a synopsis of the spanning tree group configuration information.
guard (OPTIONAL) Enter the keyword guard to display the type of guard enabled on an STP interface and the current port state.
interface interface (OPTIONAL) Enter the keyword interface and the type slot/port of the interface you want displayed. Type slot/port options are the following:
  • For a Port Channel interface, enter the keywords port-channel then a number. The range is from 1 to 128.
  • For a 10-Gigabit Ethernet interface, enter the keyword TenGigabitEthernet then the slot/port information.
root (OPTIONAL) Enter the keyword root to display configuration information on the spanning tree group root.
summary (OPTIONAL) Enter the keyword summary to only the number of ports in the spanning tree group and their state.
Command Modes EXEC Privilege
Supported Modes Full–Switch Mode
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 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.
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
                                             Timers: message age 0, forward_delay 0, hold 0
                                             Number of transitions to forwarding state 1
                                             BPDU: sent:18, received 0
                                             The port is not in the portfast mode
                                             
                                             Port 3 (TenGigabitEthernet 1/2) is Forwarding
                                             Port path cost 4, Port priority 8, Port Identifier 8.27
                                             Designated root has priority 32768, address 0001.e800.0a56
                                             Designated bridge has priority 32768, address 0001.e800.0a56
                                             Designated port id is 8.27, designated path cost 0
                                             Timers: message age 0, forward_delay 0, hold 0
                                             Number of transitions to forwarding state 1
                                             BPDU: sent:18, received 0
                                             The port is not in the portfast mode
                                             
                                             Port 4 (TenGigabitEthernet 1/3) is Forwarding
                                             Port path cost 4, Port priority 8, Port Identifier 8.28
                                             Designated root has priority 32768, address 0001.e800.0a56
                                             Designated bridge has priority 32768, address 0001.e800.0a56
                                             Designated port id is 8.28, designated path cost 0
                                             Timers: message age 0, forward_delay 0, hold 0
                                             Number of transitions to forwarding state 1
                                             BPDU: sent:31, received 0
                                             The port is not in the portfast mode
                                             
                                             Dell#
Example (Brief)
Usage Information The following describes the show spanning-tree 0 guard command shown in the example.
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).
Bpdu Filter BPDU Filter enabled - Yes, BPDU Filter disabled - No
Example (Guard) 
Dell#show spanning-tree 0 guard
                                             Interface
                                             Name   Instance Sts          Guard type
                                             --------- -------- --------- ----------
                                             Te 0/1 0        INCON(Root)  Rootguard
                                             Te 0/2 0        LIS          Loopguard
                                             Te 0/3 0        EDS (Shut)   Bpduguard

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