HP 7000 dl Router manual Copyright 2005 Hewlett-Packard Development Company, L.P 698

SROS Command Line Interface Reference Guide ATM Sub-Interface Config Command Set

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

Use the spanning-treelink-typecommand to configure the spanning-tree protocol link type for an interface. To return to the default value, use the no form of this command.

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, a port is set to auto.

Command Modes

(config-interface)# Interface Configuration Mode

Valid interfaces include: ATM sub-interface, Ethernet, virtual PPP interfaces , and virtual Frame Relay sub-interfaces

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-pointlink type. Setting the link type manually overrides the default and forces the port to use the specified link type. Using the link-type auto command, 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)#bridge 1 protocol ieee (config)#interface atm 1.1

(config-atm1.1)#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 auto allows the spanning-tree to automatically configure the link type based on the duplex of the link. Setting the link type to point-to-pointallows a half-duplex link to act as if it were a point-to-point link.

5991-2114 © Copyright 2005 Hewlett-Packard Development Company, L.P. 698