Nortel Networks 42C4911 manual L2 Failover Configurations, InternetI t t

Alteon OS Application Guide

Configuration Guidelines

This section provides important information about configuring L2 Failover:

„A failover trigger can monitor multiple static trunks or a single LACP key, but not both.

„With VLAN Monitor on, the following additional guidelines apply:

†All external ports in all trunks that are added to a single failover trigger must have the same VLAN membership and have the same PVID.

†Each failover trigger must operate on a different VLAN membership.

†Multiple failover triggers cannot operate on the same internal port.

†For each port in each trunk in a failover trigger, the trigger monitors the STP state only on the default PVID.

L2 Failover Configurations

Figure 13-1is a simple example of Layer 2 Failover. One GbE Switch Module is the primary, and the other is used as a backup. In this example, all external ports on the primary switch belong to a single trunk group, with Layer 2 Failover enabled, and Failover Limit set to 2. If two or fewer links in trigger 1 remain active, the switch temporarily disables all internal server- blade ports that reside in VLAN 1. This action causes a failover event on Server 1 and Server 2.

Trigger 1

InternetI t t

Trigger 1

Enterprise

Routing Switch

Primary
GbESM	Server 1
	Server 2
	Server 3
Backup
GbESM	Server 4
	BladeCenter

VLAN 1:

VLAN 2:

VLAN Monitor = On

Figure 13-1Basic Layer 2 Failover

220 „ Chapter 13: High Availability 42C4911, January 2007