Command Reference Guide

SROS Command Line Interface Reference Guide PPP Interface Configuration Command Set

bridge-group <group#> link-type [auto | point-to-point | shared]

Use the bridge-group link-type command 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

<group#> Bridge group number (1 to 255) specified using the bridge-group command.

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: Ethernet (eth 0/1), virtual PPP interfaces (ppp 1), and

virtual Frame Relay sub-interfaces (fr 1.20)

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. 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 ppp 1

(config-ppp 1)#bridge-group 1 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-point allows a half-duplex

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