Cisco Cisco Packet Data Interworking Function (PDIF)
StarOS Tasks
▀ Subsystem Tasks
▄ ASR 5500 System Administration Guide, StarOS Release 18
370
Session Subsystem
Table 47. Session Subsystem Tasks
Task
Description
Function
sessctrl
Session Controller
Created at StarOS start-up. Only one Session Controller instantiated in the system at
any time.
any time.
Acts as the primary point of contact for the Session Subsystem. Since it is aware of
the other subsystems running within the system, the Session Controller acts as a
proxy for the other components, or tasks, that make up the subsystem.
the other subsystems running within the system, the Session Controller acts as a
proxy for the other components, or tasks, that make up the subsystem.
Starts, configures, and coordinates the efforts of the Session Processing Subsystem
sub-managers.
sub-managers.
Works with Resource Manager to start new Session Managers when all existing
Session Managers exceed their capacity.
Session Managers exceed their capacity.
Receives context information from VPN Managers.
Distributes IP interface address information to other Session Processing Subsystem
sub-managers.
sub-managers.
Manages Enhanced Charging Service (ECS), Content Filtering and URL
Blacklisting services.
Blacklisting services.
sessmgr
Session Manager
Created by the Session Controller.
Provides a subscriber processing system that supports multiple session types.
Multiple Session Managers can run on a single CPU and/or can be distributed
throughout any CPU present in the system.
throughout any CPU present in the system.
A single Session Manager can service sessions from multiple A11 Managers, and
from multiple contexts.
from multiple contexts.
Processes protocols for A10/A11, GRE, R3, R4, R6, GTPU/GTPC, PPP, and Mobile
IP.
IP.
Manages Enhanced Charging Service, Content Filtering and URL Blacklisting
services.
services.
Session Managers are paired with AAA Managers.
a11mgr
A11 Manager
Created by the Session Controller for each context in which a PDSN service is
configured.
configured.
Receives the R-P sessions from the PCF and distributes them to different Session
Manager tasks for load balancing.
Manager tasks for load balancing.
Maintains a list of current Session Manager tasks to aid in system recovery.
The A11 Manager task is also known as the Signaling De-multiplexing task (SDT).
With session recovery (SR) enabled, this demux manager is usually established on
one of the CPUs on the first active packet processing card.
one of the CPUs on the first active packet processing card.