D-Link DWS-1008 - AirPremier MobileLAN Switch Product Manual page 131

This information is used in the following way when the AP attempts to contact a switch:
1. If Items A and B (but not Item C) are specified, and the switch's IP address is part of
the local subnet, then the AP sends an ARP request for its configured static IP address,
to ensure that it is not already in use in the network. The AP then sends a Find switch
message to UDP port 5000 at the switch's IP address.
• If the AP receives a response from that address, it sends a unicast message to
the switch, to request an operational image.
• If the AP does not get a response, then it sends a Find switch message to UDP
port 5000 on the subnet broadcast address.
• If the AP receives a response to the broadcast Find switch message,
then the process continues using the procedure described under "How a
Distributed AP Contacts a Switch (DHCP-Obtained Address)", starting with
step 6.
• If there is no response to the broadcast Find switch message, then the
process skips to step 4 on page 113.
• If the switch is not part of the local subnet, then the AP uses the default router
address to contact the switch.
2. If Item A, but not Item B is specified, then the AP uses the specified static IP configuration,
and broadcasts a Find switch message to the subnet.
• If the AP receives a response to the broadcast Find switch message, then the
process continues using the procedure described under "How a Distributed AP
Contacts a Switch (DHCP-Obtained Address)", starting with step 6.
• If there is no response to the broadcast Find switch message, the switch continues
broadcasting the Find switch message for a period of time. If still no response is
received, then the process skips to step 4 on page 113
3. If Items A and C are specified, the AP sends a DNS request to resolve the fully qualified
domain name of the switch. If the DNS server is not on the local subnet, the AP uses the
default router address to contact the DNS server.
• If there is no response from the DNS server, then the process skips to step 4 on
page 113
• If there is a response from the DNS server, then the AP sends a Find switch
message to the switch.
• If a response is received from the switch, then the AP sends a unicast
message to the switch, to request an operational image.
• If a response is not received from the switch, then the process skips to step
4 on page 113.
D-Link DWS-1008 User Manual 11