Users Guide

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}
To disable Spanning Tree group on an interface, use the no spanning-tree stp-id {cost cost |
{loopguard | rootguard} | portfast [bpduguard [shutdown-on-violation]] |
priority priority} command.
Parameters
stp-id Enter the STP instance ID. The range is 0.
cost cost Enter the keyword cost then a number as the cost. The range is from 1 to 65535. The
defaults are:
• 1-Gigabit Ethernet interface = 4.
• 10-Gigabit Ethernet interface = 2.
• Port Channel interface with 100 Mb/s Ethernet = 18.
• Port Channel interface with 1 Gigabit Ethernet = 3.
• Port Channel interface with 10 Gigabit Ethernet = 1.
loopguard Enter the keyword loopguard to enable STP loop guard on a port or port-channel
interface.
rootguard Enter the keyword rootguard to enable STP root guard on a port or port-channel
interface.
Spanning Tree Protocol (STP) 1483