Radius Accounting Support; D-Ewag - Ggsn (Gn'); Ggsn Selection; Gtp Messages - Cisco ASR 5000 Administration Manual
Enhanced wireless access gateway
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- Administration manual (466 pages) ,
- Installation manual (294 pages) ,
- Installation procedure (8 pages)
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DHCP-based Enhanced Wireless Access Gateway Overview
RADIUS Disconnect Message
RADIUS Disconnect Message (DM) is used to disconnect subscriber session in the system from a RADIUS server. The
DM Request message contains necessary attributes to identify the subscriber session.
If the system successfully disconnects the subscriber session, a DM-ACK message is sent back to the RADIUS server,
otherwise a DM-NAK message is sent with proper error reasons. If disconnect ACK is sent then as per normal
deallocation path D-eWAG sends disconnect request to WLC as well (if configured in the D-eWAG service
configuration).
Important:
received in Disconnect Request from 3GPP AAA.
RADIUS Accounting Support
D-eWAG supports RADIUS accounting. It uses subscriber template configuration to obtain accounting mode
information.
D-eWAG - GGSN (Gn')
The Gn' reference point is between the D-eWAG and the GGSN. Here the D-eWAG acts as an SGSN and initiates the
creation of a PDP context.
For every UE, the D-eWAG creates one GTP tunnel with the GGSN. The W-APN, IMSI, MSISDN, Charging
Characteristics, and QoS of the WLAN-UE are forwarded to GGSN in Create-PDP-Context-Request message.
GGSN Selection
The GGSN node is selected as per the 3GPP standard of resolving the IP address using DNS query.
This DNS query contains the DNS-APN string in the form "<apn-name>.mncXXX.mccYYY.gprs". The APN name is
derived from either local-configuration or obtained from AAA server during Access-Accept message. MCC and MNC
values are derived in the following priority:
1.
From the NAI sent by UE in Access-Request message in the form "IMSI@wlan.mncXXX.mccYYY.3gppnetwork.org".
2.
Local configuration.
Configured using the
GTP Messages
The following messages are supported over the Gn' reference point:
Create PDP Context Request/Response.
Update PDP Context Request/Response:
GGSN-initiated UPC handled for updating QoS.
Disconnect Request sent by the D-eWAG to the WLC may not contain the same attribute list that it
plmn id mcc mcc mnc mnc
GGSN-initiated UPC Request is accepted only for QoS Update case. QoS is updated for the D-eWAG
session and accept status is sent in UPC Response. UPC Requests with EUA Update, PCO Update,
APN Restriction Update, TFT Update, Direct Tunnel Update will be rejected by D-eWAG.
CLI command under the D-eWAG service.
Cisco ASR 5000 Enhanced Wireless Access Gateway Administration Guide ▄
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