Cisco ASR 5000 Series, Обзор продукта

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GGSN Support in GPRS/UMTS Wireless Data Services
▀ Features and Functionality - Base Software
▄ Cisco ASR 5000 Series Product Overview
OL-22938-02
Up to 1024 APNs can be configured in the GGSN. An APN may be configured for any type of PDP context, i.e., PPP,
IPv4, IPv6 or both IPv4 and IPv6. Many dozens of parameters may be configured independently for each APN.
Here are a few highlights of what may be configured:
Accounting : RADIUS, GTPP or none. Server group to use. Charging characteristics. Interface with mediation
servers.
Authentication : Protocol, such as, CHAP or PAP or none. Default username/password. Server group to use.
Limit for number of PDP contexts.
Enhanced Charging : Name of rulebase to use, which holds the enhanced charging configuration (e.g., eG-CDR
variations, charging rules, prepaid/postpaid options, etc.).
IP : Method for IP address allocation (e.g., local allocation by GGSN, Mobile IP, DHCP, DHCP relay, etc.). IP
address ranges, with or without overlapping ranges across APNs.
Tunneling : PPP may be tunneled with L2TP. IPv4 may be tunneled with GRE, IP-in-IP or L2TP. Load-
balancing across multiple tunnels. IPv6 is tunneled in IPv4. Additional tunneling techniques, such as, IPsec and
VLAN tagging may be selected by the APN, but are configured in the GGSN independently from the APN.
QoS : IPv4 header ToS handling. Traffic rate limits for different 3GPP traffic classes. Mapping of R98 QoS
attributes to work around particular handset defections. Dynamic QoS renegotiation (described elsewhere).
After an APN is determined by the GGSN, the subscriber may be authenticated/authorized with an AAA server. The
GGSN allows the AAA server to return VSAs (Vendor Specific Attributes) that override any/all of the APN
configuration. This allows different subscriber tier profiles to be configured in the AAA server, and passed to the GGSN
during subscriber authentication/authorization.
The GGSN's Virtual APN feature allows the carrier to use a single APN to configure differentiated services. The APN
that is supplied by the SGSN is evaluated by the GGSN in conjunction with multiple configurable parameters. Then the
GGSN selects an APN configuration based on the supplied APN and those configurable parameters. The configurable
parameters are the subscriber's mcc/mnc, whether the subscriber is home/visiting/roaming, the subscriber's domain
name and the IP address/range of the SGSN.
Important:
For more information on APN configuration, refer APN Configuration in GGSN Service
Configuration .
Bulk Statistics Support
The system's support for bulk statistics allows operators to choose to view not only statistics that are of importance to
them, but also to configure the format in which it is presented. This simplifies the post-processing of statistical data
since it can be formatted to be parsed by external, back-end processors.
When used in conjunction with the Web Element Manager, the data can be parsed, archived, and graphed.
The system can be configured to collect bulk statistics (performance data) and send them to a collection server (called a
receiver). Bulk statistics are statistics that are collected in a group. The individual statistics are grouped by schema.
The following schemas are supported for GGSN service:
System : Provides system-level statistics