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Catalyst 3750-X and 3560-X Switch Command Reference
OL-29704-01
Chapter 2 Catalyst 3750-X and 3560-X Switch Cisco IOS Commands
spanning-tree link-type
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.
spanning-tree link-type {point-to-point | shared}
no spanning-tree link-type
Syntax Description
Defaults 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.
Examples 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.
point-to-point Specify that the link type of an interface is point-to-point.
shared Specify that the link type of an interface is shared.
Release Modification
12.2(53)SE2 This command was introduced.
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