ltm rule command TCP congestion¶

iRule(1) BIG-IP TMSH Manual iRule(1)

TCP::congestion
Sets the TCP congestion control algorithm.

DESCRIPTION
Changes the TCP congestion control algorithm and initializes any state
variables unique to the new algorithm.

Syntax

TCP::congestion []

TCP::congestion

* Specifies that the system does not use a network-congestion-control
mechanism, even when congestion occurs.

TCP::congestion

* Specifies that the system uses an implementation of the TCP Fast
Recovery algorithm, which is based on the implementation in the BSD
Reno release.

TCP::congestion

* Specifies that the system uses a modification to the Reno algorithm
that responds to partial acknowledgements when SACKs are
unavailable.

TCP::congestion

* Specifies that the system uses a more aggressive, loss-based
algorithm.

TCP::congestion

* Specifies that the system uses a TCP algorithm modification that
adds a scalable, delay-based and loss-based component into the Reno
algorithm.

TCP::congestion

* Specifies that the system uses a TCP algorithm modification that
adds a delay-based and loss-based component into the Reno
algorithm.

TCP::congestion

* Specifies that the system uses a delay based TCP that senses onset
of congestion by variations in round trip time (RTT).

TCP::congestion

* Specifies that the system uses a TCP algorithm that aims to keep
network queuing delays below a particular threshold
(queue_threshold) and decides to reduce the congestion window
(cwnd) probabilistically based on its estimate of the network
queuing delay.

TCP::congestion

* Specifies that the system uses a TCP algorithm that is especially
targeted at high-speed, long-distance networks.

TCP::congestion

* Specifies that the system uses a TCP algorithm that is especially
targeted at high-speed, long-distance networks with enhanced
congestion recovery.

TCP::congestion

* Specifies that the system uses a TCP algorithm that is optimized
for high bandwidth, high delay networks.

TCP::congestion

* Specifies that the system uses a TCP algorithm based on a bandwidth
estimation metric.

RETURN VALUE
TCP::congestion returns the current congestion control algorithm.

VALID DURING
ANY_EVENT

EXAMPLES
when SERVER_CONNECTED {
log local0. "Client: [client_addr]:[client_port] - Server: [server_addr]:[server_port]."
# Set client-side congestion control to Woodside.
clientside {
log local0. "Client: congestion [TCP::congestion] to woodside"
TCP::congestion woodside
}
# Set server-side congestion control to High-Speed.
serverside {
log local0. "Server: congestion [TCP::congestion] to highspeed"
TCP::congestion highspeed
}
}

HINTS
SEE ALSO
CHANGE LOG
@BIGIP-11.6.0 --First introduced the command. @BIGIP-13.0.0 --Calling
with no arguments gets the current value.

BIG-IP 2017-01-31 iRule(1)