Cisco Cisco Packet Data Interworking Function (PDIF)
AAA Changes in Release 17
▀ AAA Enhancements for 17.0
▄ Release Change Reference, StarOS Release 17
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Previous Behavior:
If the PCRF deletes or loses session information during a Gx session update (CCR-U) initiated by the gateway,
PCRF will respond back with DIAMETER_UNKNOWN_SESSION_ID resulting in session termination even
in the case of CCR-U.
in the case of CCR-U.
If the PCRF deletes or loses session information and an Rx message is received, PCRF will not be able to
implement corresponding rules and will result in failure of subscriber voice or video calls.
For subscriber’s existing Rx sessions and active voice/video calls, PCRF will not be able to initiate cleanup of
the sessions towards the gateway and can result in wastage of the resources in the network (dedicated bearers
not removed) or can result in subscriber not able to place calls on hold or conference or remove calls from
hold.
not removed) or can result in subscriber not able to place calls on hold or conference or remove calls from
hold.
For out of sync scenarios, PCRF and gateway could be implementing different policies and can result in wastage
of resources or in poor subscriber experience. Existing behavior does not provide for a way to sync the entire
session information.
session information.
New Behavior: The gateway node and PCRF now supports the ability to exchange session information and GW
provides the complete subscriber session information to enable PCRF to build the session state. This will prevent the
occurrence of the above mentioned scenarios and ensure that GW and PCRF are always in sync. In order to support Gx
sync, two new keywords are added to the
provides the complete subscriber session information to enable PCRF to build the session state. This will prevent the
occurrence of the above mentioned scenarios and ensure that GW and PCRF are always in sync. In order to support Gx
sync, two new keywords are added to the
diameter encode-supported-features
command.
Command Changes
diameter encode-supported-features
Two new keywords are added in this command to enable the Session Recovery and Session Sync feature. When this
feature is enabled, gateway node and PCRF will exchange session information and the gateway provides the complete
subscriber session information to enable PCRF to build the session state.
feature is enabled, gateway node and PCRF will exchange session information and the gateway provides the complete
subscriber session information to enable PCRF to build the session state.
configure
context context_name
ims-auth-service service_name
policy control
diameter encode-supported-features { session-recovery | session-sync }
{ default | no } diameter encode-supported-features
end
Performance Indicator Changes
Diameter Schema
The following bulkstatistic variables are new in this schema to support Session Recovery and Session Sync feature.
read-sdr
read-sdr-err
write-sda