Cisco ASR 5000 Administration Manual page 417

StarOS Tasks
Task
l2tpdemux
l2tpmgr
linkmgr
Description Function
L2TP Demultiplexor Created by the Session Controller when an LNS service is
Task created. Only one L2TPDemux task is invoked for the entire
system.
De-multiplexes and forwards new incoming tunnel create
requests to L2TPMgrs.
Maintains information about current active tunnels in all
L2TPMgrs.
Load balances requests among L2TPMgrs.
With session recovery (SR) enabled, this demux manager is
usually established on one of the CPUs on the first active
packet processing card.
Layer 2 Tunneling Created by the Session Controller for each context in which
Protocol Manager a LAC or LNS service is configured. Additional managers
are created as needed depending on loading.
Responsible for all aspects of L2TP processing.
Maintains protocol state machines for all L2TP sessions and
tunnels.
Triggers IPSec encryption for new L2TP tunnels as needed.
Works with Session Managers to gracefully bring down
tunnels.
With session recovery (SR) enabled, this demux manager is
usually established on one of the CPUs on the first active
packet processing card.
SS7 Link Manager Created by the Session Controller when the first SS7RD
(routing domain) is activated.
Multi-instanced for redundancy and scaling purposes.
Provides SS7 and Gb connectivity to the platform.
Routes per subscriber signalling across the SS7 (including
Iu) and Gb interfaces to the SessMgr.
ASR 5000 System Administration Guide, StarOS Release 21.1
Session Subsystem
389