User's Guide

Table Of Contents
Configuring the Wireless AP
hwc_apstartup.fm
Discovery and registration overview
9034530-02, March 2010
98 HiPath Wireless Controller, Access Points and Convergence Software V7.11, User Guide
You can specify a list of static IP addresses of the HiPath Wireless Controllers
on your network. On the Static Configuration tab, add the addresses to the
Wireless Controller Search List.
Caution: Wireless APs configured with a static Wireless Controller Search
List can only connect to HiPath Wireless Controllers in the list. Improperly
configured Wireless APs cannot connect to a non-existent HiPath Wireless
Controller address, and therefore cannot receive a corrected configuration.
Step 3 – Use Dynamic Host Configuration Protocol (DHCP) Option 78 to
locate a Service Location Protocol (SLP) Directory Agent (DA), followed
by a unicast SLP request to the Directory Agent.
To use the DHCP and unicast SLP discovery method, you must ensure that
the DHCP server on your network supports Option 78 (DHCP for SLP
RFC2610). The Wireless APs use this method to discover the HiPath
Wireless Controller.
This solution takes advantage of two services that are present on most
networks:
DHCP (Dynamic Host Configuration Protocol) – The standard is a
means of providing IP addresses dynamically to devices on a network.
SLP (Service Location Protocol) A means of allowing client
applications to discover network services without knowing their location
beforehand. Devices advertise their services using a Service Agent (SA).
In larger installations, a Directory Agent (DA) collects information from
SAs and creates a central repository (SLP RFC2608).
The HiPath Wireless Controller contains an SLP SA that, when started,
queries the DHCP server for Option 78 and if found, registers itself with the
DA as service type Siemens. The HiPath Wireless Controller contains a DA
(SLPD).
The Wireless AP queries DHCP servers for Option 78 in order to locate any
DAs. The Wireless APs SLP User Agent then queries the DAs for a list of
Siemens SAs.
Option 78 must be set for the subnets connected to the ports of the HiPath
Wireless Controller and the subnets connected to the Wireless APs. These
subnets must contain an identical list of DA IP addresses.
Step 4 – Use a Domain Name Server (DNS) lookup for the host name
Controller.domain-name.
If no DA is found, or if it has no Siemens SAs registered, the Wireless AP
attempts to locate a HiPath Wireless Controller via DNS.
If you use this method for discovery, place an A record in the DNS server for
Controller.<domain-name>. The <domain-name> is optional, but if used,
ensure it is listed with the DHCP server.