software supports the SCPS (Space Communications Protocol Standard) TCP
variant. SCPS is widely used for satellite communication.
for general SCPS information.
SCPS is a TCP
variant used in satellite communication and similar applications. The appliance
can accelerate SCPS connections if the
SCPS option is selected on the
Configuration: Tuning page.
The main practical
difference between SCPS and the default appliance behavior is that SCPS-style
"selective negative acknowledgements" (SNACKs) are used instead of standard
selective acknowledgements (SACKs). These two methods of enhancing data
retransmissions are mutually exclusive, so if the appliance on one end of the
connection has SCPS enabled and one does not, retransmission performance
suffers. This condition also causes an "SCPS Mode Mismatch" alert.
If you must mix
SCPS-enabled appliances with non-SCPS-enabled appliances, deploy them in such a
way that mismatches do not occur. You can either use IP-based service class
rules or arrange the deployment so that each path has matching appliances.