• System Initiation Task (SIT): This subsystem starts tasks and initializes the system. This includes starting a set of initial tasks at system startup time (static tasks), and starting individual tasks on demand at arbitrary times (dynamic tasks).
• High Availability Task (HAT): With the Recovery Control Task (RCT) subsystem, the HAT subsystem maintains the operational state of the system. HAT monitors the various software and hardware components of the system. If there are unusual activities, such as the unexpected termination of another task, the HAT subsystem takes a suitable course of action, such as triggering an event to the RCT subsystem to take corrective action or to report the status. The end result is that there is minimal or no impact to the service.
• Recovery Control Task (RCT): This subsystem executes a recovery action for any failure that occurs in the system. The RCT subsystem receives signals from the HAT subsystem (and in some cases from the NPU subsystem) and determines what recovery actions are needed.
• Shared Configuration Task (SCT): This subsystem provides a facility to set, retrieve, and receive notification of system configuration parameters. The SCT is mainly responsible for storing configuration data for the applications that run on the system.
• Resource Management (RM): This subsystem assigns resources, such as CPU loading and memory, for every system task upon start-up. The RM subsystem monitors resource use to verify that allocations are as specified. RM also monitors all sessions and communicates with the Session Controller to enforce capacity licensing limits.
• Virtual Private Network (VPN): This subsystem manages the administrative and operational aspects of all VPN-related entities in the system. The functions performed by the VPN subsystem include:
• Network Processing Unit (NPU): This subsystem is responsible for the following:
• Card/Slot/Port (CSP): Coordinates the events that occur when any card (application or line) is inserted, locked, unlocked, removed, shutdown, or migrated. SCP also performs auto-discovery and configures ports on a newly-inserted line card. It determines how line cards map to PSC/PSC2 cards (through a Redundancy Crossbar Card (RCC), if necessary).
• Session: Performs high-touch processing of mobile subscribers’ packet-oriented data session flows. High-touch user data processing consists of the following:
•Important: Variations regarding how the managers and tasks are distributed based on session recovery are included in the Card and CPU columns in some tables. Tables without these indicators are applicable to ASR 5000s with and without session recovery. The ASR 5000 dynamically distributes processes, tasks, and managers on startup. The following tables list the typical locations but variations can occur depending on available resources.
• Any (see NOTE) Active PSC (see NOTE) Any (see NOTE) Any (see NOTE) Any (see NOTE) Any (see NOTE) Any (see NOTE) PSC (see NOTE) Any (see NOTE) Active PSC (see NOTE) Any (see NOTE) Any (see NOTE) Active PSC (see NOTE) Any (see NOTE) Active PSC (see NOTE) Any (see NOTE) Any (see NOTE) Any (see NOTE)
•
•
• PSC (see NOTE) Any (see NOTE) Active PSC (see NOTE) Any (see NOTE) Active Demux PSC (see NOTE) Any (see NOTE) Active Demux PSC (see NOTE) Any (see NOTE)
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