Cisco ASR 5500 Administration Manual page 362

Session Subsystem
Task
imsimgr
imsimgr
ipsgmgr
ASR 5500 System Administration Guide, StarOS Release 19
334
Description Function
International Mobile Starts when an MME service configuration is detected. There
Subscriber Identity is only one instance of this task:
Manager for MME
Selects which SessMgr to use for new subscriber sessions.
Maintains and reports MME-related demux statistics on
events like Attach by IMSI, Attach by GUTI, etc.
Can interact with the following tasks in the system:
- Session Controller
- MME Manager
- Session Manager
With session recovery (SR) enabled, this demux manager is
usually established on one of the CPUs on the first active
packet processing card.
International Mobile Started by the Session Controller.
Subscriber Identity
Selects SessMgr, when not done by linkmgr or sgtpcmgr
Manager for SGSN
tasks, for calls sessions based on IMSI/P-TMSI.
Load-balances across SessMgrs to select one to which a
subscriber will be assigned.
Maintains records for all subscribers on the system.
Maintains mapping between the IMSI/P-TMSI and SessMgrs.
With session recovery (SR) enabled, this demux manager is
usually established on one of the CPUs on the first active
demux packet processing card.
IP Services Gateway Created by the Session Controller.
Manager
In Server mode, acts as a RADIUS server, and supports Proxy
functionality.
In Snoop mode supports snooping RADIUS Accounting
messages.
Load balances requests among different SessMgrs.
Activates and deactivates sessions.
StarOS Tasks