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Configuring the Wireless AP

Discovery and Registration Overview

SCALANCE WLC711

User Guide, V8.11, 07/2012, C79000-G8976-C260-03 3-11

Ensure that the appropriate services on your enterprise network are prepared to support the

discovery process. The following steps summarize the discovery process:

1. Use the IP address of the SCALANCE IWLAN Controller to which the AP last connected

successfully

Once a Wireless AP has successfully registered with a SCALANCE IWLAN Controller, it

recalls that controller's IP address, and uses that address on subsequent reboots. The Wireless

AP bypasses discovery and goes straight to registration.

If this discovery method fails, it cycles through the remaining steps.

2. Use the predefined static IP addresses for the SCALANCE IWLAN Controllers on the

network (if configured).

You can specify a list of static IP addresses of the SCALANCE IWLAN Controllers on your

network. On the Static Configuration tab, add the addresses to the Wireless Controller

Search List.

3. Use Dynamic Host Configuration Protocol (DHCP) Option 60 to query the DHCP server for

available SCALANCE IWLAN Controllers. The DHCP server will respond to the Wireless AP

with Option 43, which will list the available SCALANCE IWLAN Controllers.

For the DHCP server to respond to a Wireless AP’s Option 60 request, you must configure the

DHCP server with the vendor class identifier (VCI) for each Wireless AP. You must also

configure the DHCP server with the IP addresses of the SCALANCE IWLAN Controllers. For

more information, refer to SCALANCE WLC711 Getting Started Guide.

4. Use a Domain Name Server (DNS) lookup for the host name Controller.domain-name.

The Wireless AP tries the DNS server if it is configured in parallel with SLP unicast and SLP

multicast.

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.

5. Use a multicast SLP request to find SLP SAs

The Wireless AP sends a multicast SLP request, looking for any SLP Service Agents providing

the Siemens service.

The Wireless AP will try SLP multicast in parallel with other discovery methods.

6. Use 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 SCALANCE IWLAN Controller.

This solution takes advantage of two services that are present on most networks:

– DHCP — The standard is a means of providing IP addresses dynamically to devices on a

network.

NOTICE

Wireless APs configured with a static Wireless Controller Search List can only connect to SCALANCE IWLAN

Controllers in the list. Improperly configured Wireless APs cannot connect to a non-existent SCALANCE

IWLAN Controller address, and therefore cannot receive a corrected configuration.

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Siemens EF 711 Series Guide de l'utilisateur Page 99

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