User`s manual

137
DWS-1008 User’s Manual
D-Link Systems, Inc.
Conguring DWL-8220AP Access Points
• If an switch that receives the Find DWS-1008 message does not have the
Distributed AP in its conguration but another switch in the same MobileLAN
does, the switch waits two seconds, then sends a Find DWS-1008 Reply
message with the IP address of the best switch to use. The determination of
best switch is based on the bias settings for the AP on each switch and on the
capacity of each switch to add new active AP connections.
The process skips to step 10.
• If no switches reply, the AP resends the Find DWS-1008 broadcast up to 11 more
times. If no DWS-1008s reply after all 12 attempts, the AP attempts to nd a
DWS-1008 based on DHCP option 43 values received in the DHCP ACK. The
process continues with step 4.
4. This step applies only if the DHCP ACK contained DWS-1008 IP addresses or
hostnames in the option 43 eld. If the ACK did not contain DWS-1008 IP addresses or
hostnames in the option 43 eld, skip to step 5.
If the DHCP ACK message contained a list of DWS-1008 IP addresses or hostnames in the
DHCP option 43 eld, the AP contacts the switches:
• If the DHCP ACK message contained a list of DWS-1008 IP addresses, in DHCP
option 43, the AP sends a unicast Find DWS-1008 message to each address. The
process continues with step 8.
• If the DHCP ACK message contained a list of DWS-1008 hostnames in DHCP
option 43, the AP sends DNS Requests to the DNS server for the IP addresses of
the switches, then sends a unicast Find DWS-1008 message to each address. The
process continues with step 8.
Note: This method requires DNS address records on the DNS server that map the hostnames
to the switch IP addresses.
If no switches reply, the AP resends the Find DWS-1008 messages up to 11 more times. If
no DWS-1008s reply after all 12 attempts, the AP tries to nd a switch using the DNS server.
The process continues with step 5.
5. If the AP is unable to locate an DWS-1008 on the subnet it is connected to, and is unable
to nd an DWS-1008 based on DHCP option 43, the AP sends DNS requests to both TRPZ
and wlan-switch, where the DNS sufx for mynetwork.com is learned through DHCP.
Note: You must congure a DNS address record on your DNS server for the switch IP address.
Otherwise, the DNS server cannot provide the switch’s address to the AP.