Cisco Cisco Packet Data Interworking Function (PDIF) Guía Para Resolver Problemas
System Software Task and Subsystem Descriptions
▀ Primary Subsystem Composition
▄ Cisco ASR 5000 Series System Administration Guide
OL-22970-01
Primary Subsystem Composition
Many of the primary subsystems are composed of critical tasks—controller tasks called Controllers, and subordinated
tasks called Managers. Critical tasks are essential to the system‘s ability to process calls, such as those in the SIT
subsystem.
tasks called Managers. Critical tasks are essential to the system‘s ability to process calls, such as those in the SIT
subsystem.
Controllers serve several purposes:
They monitor the state of their Managers and allow communication between Managers within the same
subsystem.
They enable inter-subsystem communication since they can communicate with the controllers of other
subsystems.
They masks 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.
call processing.
The following sections provide information about the composition of the primary subsystems that are composed of
critical, controller, and /or manager tasks:
critical, controller, and /or manager tasks:
ASR 5000 Subsystems
The following tables describe managers and tasks performing within the specified subsystems on an ASR 5000.
I
MPORTANT
:
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.
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.
Table 42. ASR 5000 System Initiation Subsystem
Task
Description
Card
CPU
SITMAIN
Initiated at system start-up, the SITMAIN task performs the following functions:
Reads and provides startup configuration to other SIT components
Starts SITREAP sub-function
Maintains CPU state information
All
All