Cisco ASR 5000 Series Administration Manual page 106

▀ How This Configuration Works
Figure 22. Non-transparent IP PDP Context Call Processing
BSS/UTRAN
Context (Ctx.)
Interface
Service or
Configuration (Cfg.)
1. If the DHCP client mode is used for the dynamic assignment of IP addresses for subscriber PDP contexts, the
system will retrieve addresses from the server over the DHCP interface during boot up and store them in cache
memory.
2. A Create PDP Context Request message for a subscriber session is sent from the SGSN to the GGSN service
over the Gn interface. The message contains information such as the PDP Type, APN, and charging
characteristics.
3. The GGSN determines whether or not it is configured with an APN identical to the one specified in the message.
If so, it determines how to process the session based on the configuration of the APN.
4. If the MS requires a dynamically assigned address, the GGSN assigns one from those stored in its memory
cache.
▄ Cisco ASR 5000 Series Gateway GPRS Support Node Administration Guide
CGF
8
2
6
SGSN
Source
Ctx.
G
GTPP
a
Cfg.
Net. Req.
PDP Ctx.
Cfg.
G
GGSN-
n
Service
AAA Server DHCP Server
5
1
7
GGSN
Dest. Ctx.
A
Auth.
A
Cfg.
A
D
DHCP
H
Cfg.
C
4
P
APN
G
Cfg.
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IP Address
Pool Cfg.
GGSN Configuration Example
Packet Data Network
OL-22944-02