Product Overview - Cisco ASR 5000 Administration Manual
Enhanced wireless access gateway
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Also See for ASR 5000:
- Administration manual (466 pages) ,
- Installation manual (294 pages) ,
- Installation procedure (8 pages)
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Product Overview
The D-eWAG solution described in this chapter is designed for centralized WLAN deployments, wherein Access Points
(APs) spread across geographical locations provide Wi-Fi access, and Wireless LAN Controllers (WLCs) located in a
central server farm control all the APs.
Figure 11.
The D-eWAG acts as first-hop L3 router to WLC with direct connectivity between them and is located in the central
server farm. With the use of Service Set Identification (SSID)-based WLAN access, subscribers can be authenticated
based on the SSID that they use in order to connect to the WLAN. The AP/WLC maintains a separate SSID for
providing 3G access. This enables the UE to select the correct SSID for obtaining 3G access through the Wi-Fi network.
The D-eWAG also acts as the AAA Proxy and the DHCP server to the UE attaching to the WLAN network. This helps
in processing all the control packets from the UE and maintaining the subscriber session to provide 3G access. While
acting as DHCP server, D-eWAG creates the PDP-Context with GGSN to obtain the IP address to be allocated to the
UE through DHCP-Response in the access side. Note that this interface with GGSN is similar to the TTG's Gn' interface
with GGSN in 3GPP.
When the UE wants to gain 3G access through the Wi-Fi network, the subscriber selects the 3G-SSID from the list of
advertised SSIDs.
The WLAN attach procedure occurs in three stages:
1. Association process
2. 802.1x EAP-SIM/AKA authentication process
3. IP address allocation process
These three steps are transparent to the subscriber accessing the Wi-Fi network and do not involve any subscriber
intervention. At the end of the WLAN attach procedure, the UE connects to the 3G network.
▄ Cisco ASR 5000 Enhanced Wireless Access Gateway Administration Guide
68
D-eWAG Deployment
DHCP-based Enhanced Wireless Access Gateway Overview
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