Cisco Cisco ASR 5000
SGSN Service Configuration Procedures
▀ Configuring and Associating the EGTP Service (S4 Only)
▄ SGSN Administration Guide, StarOS Release 18
Configuring and Associating the EGTP Service (S4 Only)
This section describes how to configure and associate the EGTP service to support S4-SGSN functionality.
The SGSN communicates with the EPC network SGW via the GTPv2 protocol over the S4 interface. GTPv2 is
configured on the chassis as part of an EGTP service. Once configured, the EGTP service then must be associated with
the configured UMTS (3G) and/or GPRS (2G) service configured on the system to provide access to the EPC network.
configured on the chassis as part of an EGTP service. Once configured, the EGTP service then must be associated with
the configured UMTS (3G) and/or GPRS (2G) service configured on the system to provide access to the EPC network.
Once the EGTP service is associated with the UTRAN and/or GERAN service, then the S4-SGSN will be chosen for
PDP context activation in the following cases:
PDP context activation in the following cases:
If the last known capability of the UE indicates that it is EPC-capable.
If the last known capability of the UE indicates it is non-EPC capable but has an EPS subscription only.
If a PDP context is already activated for the UE, and the S4 interface is already selected for the UE.
Important:
The S4 feature license must be enabled on the S4-SGSN to configure the EGTP service.
Important:
S4 support for the SGSN requires the presence of an SGTP service, even though S4 support is being
configured for the SGSN to use the S4 interface. The SGTP service is required to interface with non-EPC capable
roaming partners via the Gn interface. SGTP is also required for subscribers using mobile phones that are not EPC-
capable in an EPC network.
roaming partners via the Gn interface. SGTP is also required for subscribers using mobile phones that are not EPC-
capable in an EPC network.
Important:
Currently, the S4-SGSN does not support the transfer of PDP contexts from the S4 interface to the
Gn interface within the same S4-SGSN.
Use the following procedure to configure and associate the EGTP service to for S4 functionality on the SGSN:
Step 1
Access Context Configuration Mode.
Step 2
Create and configure the EGTP service in the desired context.
Step 3
Configure the interface type for the EGTP service.
Step 4
Configure the validation mode for the EGTP service. The default and recommened setting is
standard
.
Step 5
Associate the EGTP service with the configured 2.5G service (if configured).
Step 6
Associate the EGTP service with the configured 3G service (if configured).
Example Configuration
config
context <context_name>
egtp-service <service_name>
gtpc bind ipv4-address <ipv4_address>