Siemens HiPath C10 User Manual page 72

hwc_apstartup.fm
Configuring the wireless AP
Discovery and registration overview
Step 3 – Use Dynamic Host Configuration Protocol (DHCP) Option 78 to locate a
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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 means of providing
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IP addresses dynamically to devices on a network.
SLP (Service Location Protocol) – A means of allowing client applications to
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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 should must
contain an identical list of DA IP addresses.
Step 4 – Use a Domain Name Server (DNS) lookup for the host name
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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.
Step 5 – Use a multicast SLP request to find SLP SAs
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If all of the preceding methods fail to locate a HiPath Wireless Controller, the wireless AP
sends a multicast SLP request, looking for any SLP Service Agents providing the Siemens
service.
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HiPath Wireless Controller, Access Points and Convergence Software V4.0, C10/C100/C1000 User Guide
A31003-W1040-U101-1-7619, July 2006 DRAFT