Specifications

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Cisco Wide Area Application Services Command Reference
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Chapter 3 CLI Commands
(config) tcp
Defaults tcp cwnd-base: 2
tcp increase-xmit-timer-value: 1
tcp init-ss-threshold: 2 segments
tcp keepalive-probe-cnt: 4
tcp keepalive-probe-interval: 75 seconds
tcp keepalive-timeout: 90 seconds
Command Modes global configuration
Device Modes application-accelerator
central-manager
Usage Guidelines You can adjust the TCP stack parameters to maximize cache performance and throughput of HTTP
streams over TCP end to end. The relevant TCP parameters to maximize cache performance and
throughput include the ability to tune timeout periods, client and server receive and send buffer sizes,
and TCP window scaling behavior.
Note Because of the complexities involved in TCP parameters, care is advised in tuning these parameters. In
nearly all environments, the default TCP settings are adequate. Fine tuning of TCP settings is for
network administrators with adequate experience and full understanding of TCP operation details. See
the Cisco Wide Area Application Services Configuration Guide for more information.
Use the tcp keepalive-probe-cnt global configuration command to specify how many times the WAAS
device should attempt to connect to the device before closing the connection. The count can be from 1
to 10. The default is 4 attempts.
Use the tcp keepalive-probe-interval global configuration command to specify how often the WAAS
device is to send out a TCP keepalive. The interval can be from 1 to 120 seconds. The default is 75
seconds.
low-water-mark Specifies the memory usage mark (in megabytes) below which TCP goes
out of the memory pressure mode and enters into the normal memory
allocation mode.
low Memory usage in megabytes (4–600).
high-water-mark-
pressure
Specifies the memory usage mark (in megabytes) above which TCP goes
out of the normal memory allocation mode and enters the memory
pressure mode.
high Memory usage in megabytes (5–610).
high-water-mark-
absolute
Specifies the absolute hard limit on TCP memory usage (in megabytes).
absolute Memory usage in megabytes (6–620).