Concept Guide

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 congured (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
spanning-tree 0
Assigns a Layer 2 interface to STP instance 0 and congures a port cost or port priority, or enables loop guard, root guard, or the Portfast
feature on the interface.
Syntax
spanning-tree stp-id {cost cost | {rootguard} | portfast [bpduguard [shutdown-
on-violation]| bpdufilter] | priority priority}
1314 Spanning Tree Protocol (STP)