Configuration Guidelines; L2 Failover Configurations; Figure 13-1:Basic Layer 2 Failover - Nortel Alteon OS 42C4911 Application Manual

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:

L2 Failover Configurations

Figure 13-1
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.
Figure 13-1 Basic Layer 2 Failover
220 Chapter 13: High Availability
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.
is a simple example of Layer 2 Failover. One GbE Switch Module is the primary,
Internet
Internet
Enterprise
Routing Switch
Trigger 1
Primary
GbESM
Trigger 1
Backup
GbESM
Server 1
Server 2
Server 3
Server 4
BladeCenter
VLAN 1:
VLAN 2:
VLAN Monitor = On On
42C4911, January 2007