ADTRAN 1000R Series - Manual (Page 1025)

Command Reference Guide Port Channel Interface Config Command Set
61200510L1-35E Copyright © 2005 ADTRAN 1025
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 Link type is determined by the port’s duplex settings.
point-to-point Link type is manually set to point-to-point, regardless of duplex settings.
shared Link type is manually set 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, and 1000R 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 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-chan 1)#spanning-tree link-type point-to-point
Technology Review
Rapid transitions are possible in RSTP (rapid spanning-tree protocol) 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.