Control And Data Interfaces; R-Ewag-Ggsn Gn' Interface - 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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▀ Feature Description
Here, Wi-Fi AAA acts as the RADIUS accounting client and R-eWAG as the RADIUS accounting server. R-eWAG
extracts the necessary attributes required to create the GTP tunnel to GGSN. R-eWAG resolves the APN to get the
GGSN address to which to create the GTP tunnel. In this release, the PDP context will be created with a dynamic IP
address. On successful creation of the GTP tunnel, R-eWAG creates the association between the GGSN-assigned IP
address and the Wi-Fi IP address.
All IP data packets generated by the UE in the WLAN are directed to the R-eWAG. The R-eWAG NATs the outer
source IP address (Wi-Fi IP address) with the GGSN-assigned IP address (MPC IP address) and forwards it to the
GGSN via the GTP tunnel. The application servers in the PDN identify the UE by the GGSN-assigned IP address.
In the downlink direction, the R-eWAG NATs the outer destination address (MPC IP address) to the Wi-Fi IP address
so that it is correctly routed to the UE in the WLAN.
Control and Data Interfaces
eWAG supports the following control and data interfaces:
WLC/Wi-Fi AAA – R-eWAG:
Control Plane: The following RADIUS messages are supported on this interface:
Data Plane: There is direct IP connectivity between WLC and R-eWAG. R-eWAG receives the original
eWAG – GGSN (Gn'):
PDP Activation Messages: The following messages are supported over the Gn' reference point:
R-eWAG-GGSN Gn' Interface
▄ Cisco ASR 5000 Enhanced Wireless Access Gateway Administration Guide
20
Accounting Start
Accounting Interim
Accounting Stop
Disconnect Request
IP packets generated by UE in WLAN. There could be other network elements (routers) between
WLC and R-eWAG, which can provide Layer 2 or Layer 3 tunneling to route the WLAN-generated
packets across the public network.
Important:
ICMP Processing: ICMP packets in the downlink direction are remapped and sent to the UE.
Create PDP Context Request / Response
Update PDP Context Request / Response: R-eWAG-initiated Update PDP Context scenario is
supported as explained in the Session Update Call Flow section.
Delete PDP Context Request / Response
Error Indication
Version Not Supported
GTP Payload Forwarding
GTP Echo
RADIUS-based Enhanced Wireless Access Gateway Overview
In this release, R-eWAG does not support Tunneling (IP over GRE).
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