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Call Flows for 3G and 4G Mobile IP Users
1 The mobile device is automatically associated to the SSID broadcast by the access points to establish and
maintain wireless connectivity.
2 The AP or the WLC starts the EAP authentication process by sending an EAP Request ID to the mobile
device.
3 The mobile device sends a response pertaining to the EAP Request ID back to the AP or the WLC.
4 The WLC sends a RADIUS Access Request to the AAA server asking it to authenticate the subscriber.
5 After the subscriber is authenticated, the AAA server caches its entire user profile that includes the
information about IMSI, MSISDN, APN, and the Cisco AV pair having ssg-service-info set to GTP-service.
The cached data also includes the client's MAC address, which is set as the calling-station-ID in the
incoming EAP messages.
6 The AAA server sends the RADIUS Access Accept message to the AP or the WLC.
7 When the RADIUS Access Accept message comes back, the corresponding user profile in which the use
of GTP-service is identified is obtained.
8 The WLC sends the successful EAP authentication message to the mobile device.
9 The mobile device sends a DHCP Discover message to the iWAG. In response to this DHCP Discover
message, the DHCP goes into a new pending state to wait for the signaling on the MNO side to be
completed, which assigns an IP address to the subscriber.
In response to this DHCP Discover message, DHCP goes into a new pending state to wait for the signaling
on the MNO side to be completed, which assigns an IP address to the subscriber.
10 The iWAG finds a session associated with the subscriber MAC address and retrieves the subscriber IP
address from the session context.
11 The iWAG sends a RADIUS Access Request to the AAA server asking it to authenticate the subscriber
using the MAC address in it as the calling-station-ID, while also providing all other known subscriber
information, IDs, and IMSI in this Access Request message.
12 When the AAA server sends back the RADIUS Access Accept message to the iWAG, the user profile in
which the use of GTP-service is identified is obtained.
OL-30226-03
Intelligent Wireless Access Gateway Configuration Guide
3G DHCP Discover Call Flow
103
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