Cisco Cisco Packet Data Interworking Function (PDIF) Manual De Mantenimiento
Generally Available 06-30-2010
SGSN Features in Release 8.1
1-55
SGSN Features in Release 8.1
This section provides information for new features in the Serving GPRS Support Node
(SGSN) product.
(SGSN) product.
Default APN
Operators can configure a “default APN” for subscribers not provisioned in the HLR. This
feature is available in releases 8.1 and higher.
feature is available in releases 8.1 and higher.
The Default APN feature will be used in error situations when the SGSN cannot select a
valid APN via the normal APN selection process. Within an operator policy, a default APN
can be configured for the SGSN to: override a requested APN when the HLR does not have
the requested APN in the subscription profile. provide a viable APN if APN selection fails
because there was no "requested APN" and wildcard subscription was not an option.
valid APN via the normal APN selection process. Within an operator policy, a default APN
can be configured for the SGSN to: override a requested APN when the HLR does not have
the requested APN in the subscription profile. provide a viable APN if APN selection fails
because there was no "requested APN" and wildcard subscription was not an option.
In either of these instances, the SGSN can provide the default APN as an alternate behavior
to ensure that PDP context activation is successful.
to ensure that PDP context activation is successful.
Refer to the SGSN Operator Policy Configuration Mode in the Command Line Interface
Reference for the command to configure this feature.
Reference for the command to configure this feature.
Direct Tunnel Support
In accordance with standards, one tunnel functionality enables the SGSN to establish a
direct tunnel at the user plane level - a GTP-U tunnel, directly between the RAN and the
GGSN.
direct tunnel at the user plane level - a GTP-U tunnel, directly between the RAN and the
GGSN.
Figure 1-4 SGSN Direct Tunnel