Port Type and Link Type, Edge Port | Nortel Networks 42C4911

Alteon OS Application Guide

Port Type and Link Type

Spanning Tree configuration includes the following parameters to support

RSTP and MSTP: edge port and link type. Although these parameters are configured for Spanning Tree Groups 1-128 (/cfg/l2/stg x/port x), they only take effect when RSTP/MSTP is turned on.

Edge Port

A port that does not connect to a bridge is called an edge port. Edge ports generally connect to a server, therefore, ports INT1-INT14 should have edge enabled. Edge ports can start for- warding as soon as the link is up.

Edge ports do not take part in Spanning Tree, and should not receive BPDUs. If a port with edge enabled does receive a BPDU, it begins STP processing only if it is connected to a span- ning tree bridge. If it is connected to a host, the edge port ignores BPDUs.

Link Type

The link type determines how the port behaves in regard to Rapid Spanning Tree. The link type corresponds to the duplex mode of the port. A full-duplex link is point-to-point (p2p), while a half-duplex link should be configured as shared. If you select auto as the link type, the port dynamically configures the link type.

RSTP Configuration Guidelines

This section provides important information about configuring Rapid Spanning Tree Groups:

When RSTP is turned on, STP parameters apply only to STP Group 1.

When RSTP is turned on, STG 2-126 are turned off.

42C4911, January 2007

Chapter 6: Rapid Spanning Tree Protocol/Multiple Spanning Tree Protocol 119

42C4911 specifications

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Nortel Networks 42C4911 manual Port Type and Link Type, Rstp Configuration Guidelines, Edge Port

Models: 42C4911