Cisco ASR 5000 Series User Manual

GGSN Support in GPRS/UMTS Wireless Data Services
▀ Features and Functionality - Base Software
▄ Cisco ASR 5000 Series Product Overview
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Figure 84. Direct Tunnel Support in GGSN
A major consequence of deploying Direct Tunnel is that it produces a significant increase in control plane load on both
the SGSN and GGSN components of the packet core. It is therefore of paramount importance to a wireless operator to
ensure that the deployed GGSNs are capable of handling the additional control plane loads introduced of part of Direct
Tunnel deployment. The Cisco GGSN and SGSN offers massive control plane transaction capabilities, ensuring system
control plane capacity will not be a capacity limiting factor once Direct Tunnel is deployed.
DHCP Support
Dynamic IP address assignment to subscriber IP PDP contexts using the Dynamic Host Control Protocol as defined by
the following standards:
RFC 2131, Dynamic Host Configuration Protocol
RFC 2132, DHCP Options and BOOTP Vendor Extensions
As described in the PDP Context Support section of this document, the method by which IP addresses are assigned to a
PDP context is configured on an APN-by-APN basis. Each APN template dictates whether it will support static or
dynamic addresses.
Dynamically assigned IP addresses for subscriber PDP contexts can be assigned through the use of DHCP.
The system can be configured to support DHCP using either of the following mechanisms:

Cisco ASR 5000 Series Specifications

General

Brand	Cisco
Model	ASR 5000 Series
Category	Network Router
Language	English