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Alteon OS Application Guide
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Chapter 13: High Availability 42C4911, January 2007
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 13-1 is 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.
Figure 13-1 Basic Layer 2 Failover
Internet
Internet
Enterprise
Routing Switch
Primary
GbESM
Backup
GbESM
Trigger 1
BladeCenter
Server
1
Server
3
Server
2
Server
4
Trigger 1
VLAN 1:
VLAN 2:
VLAN Monitor = OnOn