Spanning-Tree Link-Type - Cisco Catalyst 3550 Command Reference Manual

spanning-tree link-type

spanning-tree link-type
Use the spanning-tree link-type interface configuration command to override the default link-type
setting, which is determined by the duplex mode of the port, and to enable Rapid Spanning-Tree Protocol
(RSTP) transitions to the forwarding state. Use the no form of this command to return to the default
setting.
Syntax Description
point-to-point
shared
Defaults The switch derives the link type of a port from the duplex mode. A full-duplex port is considered a
point-to-point link, and a half-duplex port is considered a shared link.
Command Modes
Interface configuration
Command History Release
12.1(9)EA1
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 port 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 RSTP rapid transitions to the forwarding state:
Switch(config-if)# spanning-tree link-type shared
You can verify your settings by entering the show spanning-tree mst interface interface-id privileged
EXEC command.
Related Commands Command
show spanning-tree
interface-id
Catalyst 3550 Multilayer Switch Command Reference
2-418
spanning-tree link-type {point-to-point | shared}
no spanning-tree link-type
Specify that the link type of a port is point-to-point.
Specify that the link type of a port is shared.
Modification
This command was first introduced.
mst interface
Description
Displays multiple spanning-tree (MST) information for the
specified interface.
Chapter 2 Cisco IOS Commands
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