Cisco ASR 5000 Series Administration Manual page 58

▀ Configuring the System as a Standalone eGTP S-GW
Figure 8.
U E
C o n te xt (C tx.)
In te rfa ce
S e rvice o r
C o n fig u ra tio n (C fg .)
1. A subscriber session from the MME is received by the S-GW service over the S11 interface.
2. The S-GW service determines which context to use to access PDN services for the session. This process is
described in the How the System Selects Contexts section located in the Understanding the System Operation
and Configuration chapter of the System Administration Guide.
3. S-GW uses the configured egress context to determine the eGTP service to use for the outgoing S5/S8
connection.
4. The S-GW establishes the S5/S8 connection by sending a create session request message to the P-GW.
5. The P-GW responds with a Create Session Response message that includes the PGW S5/S8 Address for control
plane and bearer information.
6. The S-GW conveys the control plane and bearer information to the MME in a Create Session Response message.
▄ Cisco ASR 5000 Series Serving Gateway Administration Guide
eGTP S-GW Call Processing Using a Single Ingress and Egress Context
e N o d e B
S 1
e G T P
-U
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S e rv ic e
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S -G W S e rvice
G T P -U S e rvice
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M M E
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7 8
4
5
S -G W
S
e G T P
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S
S e rv ic e
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G T P -U S e rvice
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E g re s s
C tx . C tx .
L o c a l C tx.
Serving Gateway Configuration
P -G W
P a cke t D a ta
N e tw o rk
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