Administrator Guide

BPDU: sent:18, received 0
The port is not in the portfast mode
Port 28 (GigabitEthernet 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)
Dell# show span 0 brief
Executing IEEE compatible Spanning Tree Protocol
Root ID Priority 32768
Address 0001.e800.0a56
Root Bridge hello time 2, max age 20, forward delay 15
Bridge ID Priority 32768,
Address 0001.e800.0a56
Configured hello time 2, max age 20, forward delay 15
Interface Designated
Name PortID Prio Cost Sts Cost Bridge ID PortID
-------------- ------ ---- ---- --- ----- ------------------
Gi 1/1 8.26 8 4 FWD 0 32768 0001.e800.0a56 8.26
Gi 1/2 8.27 8 4 FWD 0 32768 0001.e800.0a56 8.27
Gi 1/3 8.28 8 4 FWD 0 32768 0001.e800.0a56 8.28
Dell#
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).
Example (Guard)
Dell#show spanning-tree 0 guard
Interface
Name Instance Sts Guard type
-------- -------- --------- ----------
Gi 1/1 0 INCON(Root) Rootguard
Gi 1/2 0 LIS Loopguard
Gi 1/3 0 EDS (Shut) Bpduguard
spanning-tree
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 | {loopguard | rootguard} | portfast [bpduguard
[shutdown-on-violation]] | priority priority}
1568 Spanning Tree Protocol (STP)