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Command Reference Guide
spanning-tree link-type
Use the spanning-tree link-type command to configure the spanning tree protocol link type for each
interface. Use the no form of this command to return to the default setting. Variations of this command
include:
spanning-tree link-type auto
spanning-tree link-type point-to-point
spanning-tree link-type shared
Syntax Description
auto
point-to-point
shared
Default Values
By default, the interface is set to auto.
Command History
Release 5.1
Functional Notes
This command overrides the default link type setting determined by the duplex of the individual port. By
default, a port configured for half-duplex is set to shared link type, and a port configured for full-duplex is
set to point-to-point link type. Setting the link type manually overrides the default and forces the port to
use the specified link type. Use the link-type auto command to restore the convention of determining link
type based on duplex settings.
Usage Examples
The following example forces the link type to point-to-point, even if the port is configured to be
half-duplex:
(config)#interface port-channel 1
(config-p-chan1)#spanning-tree link-type point-to-point
Technology Review
Rapid transitions are possible in Rapid Spanning Tree Protocol (RSTP) by taking advantage of
point-to-point links (a port is connected to exactly one other bridge) and edge-port connections (a port is
not connected to any additional bridges). Setting the link type to point-to-point allows a half-duplex link to
act as if it were a point-to-point link.
60000CRG0-35E
Determines link type by the port's duplex settings.
Manually sets link type to point-to-point regardless of duplex settings.
Manually sets link type to shared regardless of duplex settings.
Command was introduced.
Copyright © 2012 ADTRAN, Inc.
Port Channel Interface Command Set
2451
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