Example (Guard)

Field

Description

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).

Dell#show spanning-tree

0 guard

 

Interface

Instance

Sts

 

Guard type

Name

 

--------

--------

---------

----------

Te 1/1

0

INCON(Root)

Rootguard

Te 1/2

0

LIS

(Shut)

Loopguard

Te 1/3

0

EDS

Bpduguard

spanning-tree

Assigns a Layer 2 interface to STP instance 0 and configures 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)

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Dell 9.7(0.0) manual Example Guard Field Description Instance, Lis, Eds