Recovery (ICSR) provides a framework for sessmgr
instance-level checkpointing within an ICSR framework. A
checkpoint is a snapshot of the status of an application. Checkpointing
can be used by sessmgr to push instance level information to the
checkpointing sends messages to specific sessmgr instances. Each application, such
as GGSN, PDSN, P-GW, S-GW
or SGSN, is responsibility for encoding and decoding the
checkpoint message. The ICSR framework provides the APIs
for transport of the instance-level checkpoint information
and associated statistics.
contain full session information and micro-checkpoints
contain only a few variables. Macro-checkpoints
are sent initially from the active chassis to the standby chassis on
power up and reload, and periodically thereafter. When
a standby chassis receives macro-checkpoints, it
clears any existing CRR (Call Recovery Record) or
CLP (Call Line Pointer) related to that session, and
creates a new CRR or CLP. Macro-checkpoints are
also known as full checkpoints (FCs).
To conserve processing
cycles and memory, dynamic and periodic updates from an
active chassis to a standby chassis are done using micro-checkpoints.
output of the Exec mode show srp info command displays a
complete list of SRP checkpoints.