Cisco ASR 5500 Administration Manual page 289

Session Recovery
• ASR 5000 only – HNB-GW: HNB Session over IuH
• ASR 5000 only – HNB-GW: HNB-CN Session over IuPS and IuCS
• ASR 5000 only – HNB-GW: SeGW Session IPSec Tunnel
• ASR 5000 only – HSGW services for IPv4
• IPCF (Intelligent Policy Control Function)
• ASR 5000 only – IPSG-only systems (IP Services Gateway)
• LNS session types (L2TP Network Server)
• MME (Mobility Management Entity)
• ASR 5000 only – NEMO (Network Mobility )
• P-GW services for IPv4
• ASR 5000 only – PDIF (Packet Data Interworking Function)
• PDSN services supporting simple IP, Mobile IP, and Proxy Mobile IP
• S-GW (Serving Gateway)
• SaMOG (S2a Mobility over GTP) Gateway (CGW and MRME)
• ASR 5000 only – SAE-GW (System Architecture Evolution Gateway)
• ASR 5000 only – SGSN services (3G and 2.5G services) for IPv4 and PPP PDP contexts
Session recovery is not supported for the following functions:
• Destination-based accounting recovery
• GGSN network initiated connections
• GGSN session using more than 1 service instance
• MIP/L2TP with IPSec integration
• MIP session with multiple concurrent bindings
• Mobile IP sessions with L2TP
• Multiple MIP sessions
Important Always refer to the Administration Guides for individual products for other possible session recovery and
Interchassis Session Recovery (ICSR) support limitations.
When session recovery occurs, the system reconstructs the following subscriber information:
• Data and control state information required to maintain correct call behavior.
• A minimal set of subscriber data statistics; required to ensure that accounting information is maintained.
• A best-effort attempt to recover various timer values such as call duration, absolute time, and others.
• The idle time timer is reset to zero and the re-registration timer is reset to its maximum value for HA
sessions to provide a more conservative approach to session recovery.
ASR 5500 System Administration Guide, StarOS Release 19
How Session Recovery Works
261