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global
BIG-IP® Reference Guide 7-11
fastest_max_idle_time
Sets the number of seconds a node can be left idle by the fastest load
balancing mode. This forces the BIG-IP to send fewer connections to a node
that is responding slowly, and also allows the BIG-IP to periodically
recalculate the response time of the slow node.
fastflow_active
You can use this variable to control additional enhancements that speed
packet flow for TCP connections when the packets are not fragmented. In
most configurations these software enhancements are automatically turned
on and do not require any additional configuration.
However, you may want to turn off these enhancements for individual
virtual servers that use IPFW rate filters. With the speed enhancements on,
IPFW only examines the first SYN packet in any given connection. If you
want to filter all packets, you should turn the speed enhancements off. To do
this, you first set the global state of the system on, and then you turn the
feature off for individual virtual servers that use IPFW rate filtering. You
can also change the settings for these enhancements from the command line
or in the Configuration utility.
There are three global states you can set with fastflow_active. The default
state is auto. The global states are:
•off
•auto
•on
The additional speed enhancements are globally disabled if the sysctl
variable fastflow_active is off or if fastflow_active is set to auto and an
IPFW rate filter exists in the configuration.
To provide the benefits of software acceleration for virtual servers that do
not use rate filtering and turn off software acceleration for virtual servers
that use IPFW rate filtering, you can set the global variable fastflow_active
to on with the following command:
b global fastflow_active on
After you set the sysctl variable, use the following bigpipe command to
disable software acceleration for virtual servers that use IPFW rate filtering:
b virtual <ip>:<port> accelerate disable
gateway failsafe
Turns the gateway fail-safe feature on and off. This command is supported
only for redundant systems.
The typical use of gateway fail-safe is a setup where active and standby
BIG-IP units use different routers as gateways to the Internet. Fail-over is
triggered if the gateway for the active unit is unreachable.
To arm fail-safe on the gateway, enter the following command:
b global gateway failsafe arm
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