Specifications

AP Overview
9-12 Configuring Access Points
Example AP Boot over a Layer 3 Network
Figure 9‐3showsanexampleofthebootprocessforanAPconnectedthroughaLayer 3network.
Figure 9-3 AP Booting over Layer 3 Network
1. TheAPsendsDHCPDiscovermessage fromtheAP.
2. TheDHCPserverreplieswithaDHCPOffermessagecontaininganIPaddressfortheAP,the
defaultrouterIPaddressfortheAP’sIP
subnet,theDNS serveraddress,andthedomain
name.APthensendsaDHCPRequestmessagetotheserverandreceivesanAckfromthe
server.
3. TheAPsendsabroadcastFindRASmessagetotheIPsubnetbroadcastaddress.
4. WhentheAPisunabletolocateaRASonthesubnet
itisconnectedto,theAPthensendsa
DNSrequestforwlan.example.com.
5. TheDNSserversendsthesystemIPaddressoftheRASmappedtowlan.example.com.Inthis
example,theaddressisforRAS1.
6. TheAPsendsaunicastFindRASmessagetoRAS1.
Router
Router
Layer 3
Layer 3
DHCP Server
2
5
DAP 1
serial_id 0322199998
model AP3000
bias = high
DAP 1
serial_id 0322199998
model AP3000
bias = low
DAP 1
serial_id 0322199998
model AP3000
bias = high
serial_id
0322199998
model AP3000
3
4
7
1
6
example.com =
10.10.10.4
DNS Server
8
Layer 2
System IP address
10.10.10.4
RAS1
active APs = 49
System IP address
10.10.40.4
active APs = 34
System IP address
10.10.50.4
active APs = 62
RAS3
RAS2
AP