•
Additional software or hardware failures occur during the session recovery operation. For example, an
AAA manager fails while the state information it contained was being used to populate the newly
activated session manager task.
•
A lack of hardware resources (packet processing card memory and control processors) to support session
recovery.
After a session recovery operation, some statistics, such as those collected and maintained on a per manager
basis (AAA Manager, Session Manager, etc.) are in general not recovered, only accounting and billing
related information is checkpointed and recovered.
Important
Session Recovery is available for the following functions:
•
Any session needing L2TP LAC support (excluding regenerated PPP on top of an HA or GGSN session)
•
ASR 5500 only
–
Closed RP PDSN services supporting simple IP, Mobile IP, and Proxy Mobile IP
•
ASR 5500 only
–
eHRPD service (evolved High Rate Packet Data)
•
ASR 5500 only
–
ePDG service (evolved Packet Data Gateway)
•
GGSN services for IPv4 and PPP PDP contexts
•
HA services supporting Mobile IP and/or Proxy Mobile IP session types with or without per-user Layer
3 tunnels
•
ASR 5500 only
–
HNB-GW: HNB Session over IuH
•
ASR 5500 only
–
HNB-GW: HNB-CN Session over IuPS and IuCS
•
ASR 5500 only
–
HNB-GW: SeGW Session IPSec Tunnel
•
ASR 5500 only
–
HSGW services for IPv4
•
IPCF (Intelligent Policy Control Function)
•
ASR 5500 only
–
IPSG-only systems (IP Services Gateway)
•
LNS session types (L2TP Network Server)
•
MME (Mobility Management Entity)
•
ASR 5500 only
–
NEMO (Network Mobility )
•
P-GW services for IPv4
•
ASR 5500 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 5500 only
–
SAE-GW (System Architecture Evolution Gateway)
•
ASR 5500 only
–
SGSN services (3G and 2.5G services) for IPv4 and PPP PDP contexts
Session recovery is
not supported
for the following functions:
ASR 5500 System Administration Guide, StarOS Release 21.5
258
Session Recovery
How Session Recovery Works