GGSN Support in GPRS/UMTS Wireless Data Services
Features and Functionality - Base Software â–€
Cisco ASR 5000 Series Product Overview â–„
DHCP-proxy: The system acts as a proxy for client (MS) and initiates the DHCP Discovery Request on behalf
of client (MS). Once it receives an allocated IP address from DHCP server in response to DHCP Discovery
Request, it assigns the received IP address to the MS. This allocated address must be matched with the an
address configured in an IP address pool on the system. This complete procedure is not visible to MS.
DHCP-relay: The system acts as a relay for client (MS) and forwards the DHCP Discovery Request received
from client (MS). Once it receives an allocated IP address from DHCP server in response to DHCP Discovery
Request, it assigns the received IP address to the MS.
Important: For more information on DHCP service configuration, refer DHCP Configuration section in GGSN
Service Configuration chapter.
DSCP Marking
Provides support for more granular configuration of DSCP marking.
For different Traffic class, the GGSN supports per-GGSN service and per-APN configurable DSCP marking for Uplink
and Downlink direction based on Allocation/Retention Priority in addition to the current priorities.
Generic Corporate APN
Any operator may not be aware of the IP address that a corporation may assign to subscribers through AAA or DHCP
and the traffic is sent from the GGSN to the corporation over a tunnel, this feature allows the operator to terminate such
users.
Normally the GGSN validates the IP address assigned by RADIUS, however this feature removes the need for this, but
does assume that the subscriber traffic is forwarded out of the GGSN through a tunnel.
When the IP address is statically assigned, i.e., either MS provided, RADIUS provided or DHCP provided, the IP
address validation is not performed if the address policy is set to disable address validation.
ACL and Policy Group Info processing would still be performed.
Additionally, there is support for Virtual APN selection based on RADIUS VSA returned during Authentication.
The existing Virtual APN selection mechanism is being enhanced to select the Virtual APN based on RADIUS VSA
returned during authentication.
The selected V-APN may further require AAA authentication (and accounting) with its own servers.
GTPP Support
Support for the GPRS Tunnelling Protocol Prime (GTPP) in accordance with the following standards:
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