WESM zl Management and Configuration Guide WT.01.28 and greater

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Introduction
ProCurve Wireless Edge Services zl Module
ProCurve Wireless Edge Services zlModule
The ProCurve Wireless Edge Services zl Module transforms a ProCurve Switch
5400zl Series or ProCurve Switch 8200zl Series into a wireless services-enabled
switch. Together with one or more radio ports (RPs), this wireless services-enabled
switch creates a Wireless LAN System.
With its default RP license, each Wireless Edge Services zl Module can support up
to 12 RPs (for a total of 24 radios). If you purchase and install additive RP licenses,
the module can support up to 156 RPs (for a total of 312 radios). Each RP radio can
support up to 256 stations simultaneously, although more stations always translates
to less bandwidth for each.
A wireless network can include several Wireless Edge Services zl Modules. These
modules can function independently, or you can combine them in several ways. You
can join up to twelve modules in a group to provide redundancy. You can also group
modules in a Layer 3 mobility domain, which enables wireless stations to roam from
a module in one Ethernet subnetwork to a module in a different subnetwork.
A ProCurve Wireless LAN System—which includes a Wireless Edge Services zl
Module and its adopted RPs—can provide these services:
■ Association—Mobile users must be able to locate and connect to the wireless
network.
■ Authentication—Typically, users and the wireless access provider should
authenticate each other so that each knows that it is connecting to the correct peer.
■ Encryption—Wireless network traffic may be encrypted to protect it from
interception.
■ Bridging—Traffic crossing from the wireless network to the wired network
should be placed in the proper subnetwork, or virtual LAN (VLAN), and
appropriately controlled.
As the interface between the wireless and the wired network, the Wireless Edge
Services zl Module manages these services. After bridging traffic to the wired
network, the module can also provide Layer 3 capabilities, such as Dynamic Host
Configuration Protocol (DHCP) services, Network Address Translation (NAT), and
filtering with a firewall.
Among other functions, the Wireless Edge Services zl Module:
■ manages a set of wireless LANs (WLANs)—each of which is identified by a
service set identifier (SSID) and defines various network and security policies