Spanning-Tree Link-Type - Cisco Catalyst 3750-X Command Reference Manual

Cisco ios release 15.2(1)e and later

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Chapter 2 Catalyst 3750-X and 3560-X Switch Cisco IOS Commands

spanning-tree link-type

Use the spanning-tree link-type interface configuration command on the switch stack or on a

standalone switch to override the default link-type setting, which is determined by the duplex mode of

the interface, and to enable rapid spanning-tree transitions to the forwarding state. Use the no form of

this command to return to the default setting.

Syntax Description

point-to-point

The switch derives the link type of an interface from the duplex mode. A full-duplex interface is

considered a point-to-point link, and a half-duplex interface is considered a shared link.

Command Modes

Interface configuration

Command History

Usage Guidelines

You can override the default setting of the link type by using the spanning-tree link-type command. For

example, a half-duplex link can be physically connected point-to-point to a single interface on a remote

switch running the Multiple Spanning Tree Protocol (MSTP) or the rapid per-VLAN spanning-tree plus

(rapid-PVST+) protocol and be enabled for rapid transitions.

This example shows how to specify the link type as shared (regardless of the duplex setting) and to

prevent rapid transitions to the forwarding state:

Switch(config-if)# spanning-tree link-type shared

You can verify your setting by entering the show spanning-tree mst interface interface-id or the show

spanning-tree interface interface-id privileged EXEC command.

spanning-tree link-type {point-to-point | shared}

no spanning-tree link-type

Specify that the link type of an interface is point-to-point.

Specify that the link type of an interface is shared.

Modification

This command was introduced.

Catalyst 3750-X and 3560-X Switch Command Reference

spanning-tree link-type

Catalyst 3560-x