User's Guide

Table Of Contents

The following is the trac ﬂow of the topology illustrated in Figure 90:

• The AP establishes the active tunnel to connect to the primary Extreme Campus Controller.

• The Extreme Campus Controller sends the conﬁguration to the AP. This conﬁguration also contains

the port information of the backup Extreme Campus Controller.

• On the basis of the backup Extreme Campus Controller port information, the AP connects to the

backup Extreme Campus Controller via the backup tunnel.

• After the connection is established via the backup tunnel, the backup Extreme Campus Controller

sends the backup conﬁguration to the wireless AP.

• The AP receives the backup conﬁguration and stores it in its memory to use it for failing over to the

backup Extreme Campus Controller. During this entire time, the AP is connected to the primary

Extreme Campus Controller via the active tunnel.

Session availability applies only to the following topologies:

• Bridge Trac Locally at AC

• Bridge Trac Locally at AP

Availability Pair Settings

Table 92: Availability Pair Settings

Field Description

Peer IP Address Physical VLAN address of the paired appliance. This is the IP

address of the "Physical 1" interface (port esa0), which matches

the VLAN deﬁnition under System > Interfaces.

Role Select the role of the paired appliance. Valid values are Primary

or Backup.

Note: The conﬁguration of the Primary appliance is copied to

the Secondary appliance.

Auto AP Balancing Select the load balancing conﬁguration for the availability pair.

In an availability pair, an AP establishes an active tunnel to one

appliance and a backup tunnel to the other appliance. The

active tunnel is used to pass the client data over tunneled

topologies.

• In an Active-Active conﬁguration, approximately half of the

APs establish an active tunnel to the primary appliance. The

remaining APs establish an active tunnel to the backup

appliance, spreading the load across the availability pair.

• In an Active-Passive conﬁguration, all APs establish an

active tunnel to the primary appliance. The secondary

appliance is used for failover only.