ADTRAN 1000R Series

Command Reference Guide Ethernet Interface Configuration Command Set

spanning-tree link-type [auto | point-to-point | shared]

Use the spanning-tree link-type command to configure the spanning tree protocol link type for each

interface. Use the no version of the command to return to the default setting.

Syntax Description

auto Determines link type by the port’s duplex settings.

point-to-point Manually sets link type to point-to-point, regardless of duplex settings.

shared Manually sets link type to shared, regardless of duplex settings.

Default Values

By default, the interface is set to auto.

Applicable Platforms

This command applies to the NetVanta 300, 1000, 1000R, 3000, 4000, and 5000 and Total Access 900

Series units.

Command History

Release 5.1 Command was introduced.

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 re store the convention of determining link

type based on duplex settings.

Technology Review

Rapid transitions are possible in rapid spanning-tree protocol (RSTP) by taking advantage of point-to-point

links (a port is connec te d to ex actly one other brid ge) and edge-port connections (a port is not connected

to any additional bridges). Se tting the link- type to auto allows the spanning -tree to automatically configur e

the link type based on the dupl ex of the link. Setting the link type to point-to-point allo ws a half-duplex link

to act as if it were a point-to-point link.

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 eth 0/3

(config-eth 0/3)#spanning-tree link-type point-to-point