Cisco Cisco Packet Data Gateway (PDG) Guía Para Resolver Problemas
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GGSN Configuration Example
How This Configuration Works ▀
Cisco ASR 5000 Series Gateway GPRS Support Node Administration Guide ▄
OL-22943-01
Figure 23. PPP PDP Context Call Processing
S o u rc e
C tx .
G G S N -
S e rv ic e
S e rv ic e
G T P P
C fg .
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P D P C tx .
C fg .
D e s t. C tx .
A u th .
C fg .
D H C P
C fg .
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IP A d d re s s
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In te rfa c e
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C o n fig u ra tio n (C fg .)
C o n fig u ra tio n (C fg .)
C o n te x t (C tx .)
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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.
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.
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. The GGSN returns an affirmative Create PDP Context Response to the SGSN over the Gn interface.
5. The MS and GGSN negotiate PPP.
6. The GGSN authenticates the subscriber as part of the PPP negotiation by communicating with a RADIUS server
5. The MS and GGSN negotiate PPP.
6. The GGSN authenticates the subscriber as part of the PPP negotiation by communicating with a RADIUS server
over the AAA interface.