Wireless/Redundant Edge Services xl Module Management and Configuration Guide WS.01.03 or greater

4-2

Redundancy Groups

High Availability for Wireless Services

For many companies, wireless access has become as critical to their business

as traditional wired access. Recognizing the importance of wireless access,

ProCurve Networking has designed its wireless services with high availability

in mind. To provide failover capabilities for the Wireless Edge Services xl

Module (J9001A), you can purchase a Redundant Wireless Services xl

Module (J9003A).

The Redundant Wireless Services xl Module provides the same functionality

as the Wireless Edge Services xl Module, with one exception: the Redundant

Wireless Services xl Module does not have any radio port (RP) licenses. On

its own, the Redundant Wireless Services xl Module cannot adopt any RPs.

When combined with the Wireless Edge Services xl Module in a redundancy

group, however, the Redundant Wireless Services xl Module can adopt RPs

under certain circumstances. Primarily, the Redundant Wireless Services xl

Module is designed to adopt RPs if the Wireless Edge Services xl Module

becomes unavailable for any reason. (For more information about RP adop-

tion in a redundancy group, see “Active or Standby Mode” on page 4-5.)

For higher availability, you should install the Wireless Edge Services xl Module

and the Redundant Edge Services xl Module in separate switch chassis. Then

if one wireless services-enabled switch becomes unavailable—due to a cable

failure, for example—the other wireless services-enabled switch can still

provide the wireless services your company needs. (See Figure 4-1.)

Although this configuration provides a higher level of redundancy, you can

also install both the Wireless Edge Services xl Module and the Redundant

Wireless Services xl Module in the same switch chassis. The Redundant

Wireless Services xl Module then provides wireless services in the unlikely

event that the Wireless Edge Services xl Module experiences a hardware or

software failure.