•
Per-interface packet filtering
•
Traffic management and traffic engineering
•
Passing user data frames to/from packet processing CPUs
•
Modifying, adding, or stripping datalink/network layer headers
•
Recalculating checksums
•
Maintaining statistics
•
Managing external Ethernet interfaces
•
Card/Slot/Port (CSP): Coordinates the events that occur when any card is inserted, locked, unlocked,
removed, shutdown, or migrated. CSP also performs auto-discovery and configures ports on a
newly-inserted interface card. It determines how interface cards map to packet processing cards.
The CSP subsystem runs only on the active management card and synchronizes the information it
contains with the SCT subsystem on the standby management card. It is started by the SIT subsystem
and monitored by the HAT subsystem.
•
Session Manager (SM): Performs high-touch processing of mobile subscribers' packet-oriented data
session flows. High-touch user data processing consists of the following:
•
Payload transformation
•
Filtering and scheduling
•
Statistics collection
•
Policing
Controllers and Managers
Many of the primary subsystems are composed of controller tasks called Controllers, and subordinated tasks
called Managers.
Controllers serve several purposes:
•
Monitor the state of their Managers and allow communication between Managers within the same
subsystem.
•
Enable inter-subsystem communication since they can communicate with the controllers of other
subsystems.
•
Mask the distributed nature of the software from the user allowing for ease of management.
Managers manage resources and mappings between resources. In addition, some managers are directly
responsible for call processing.
For information about the primary subsystems that are composed of critical, controller, and /or manager tasks,
see Subsystem Tasks, on page 388.
ASR 5500 System Administration Guide, StarOS Release 21.4
387
StarOS Tasks
Controllers and Managers
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