Manual Chapter : Eviction policy strategy algorithms

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BIG-IP AFM

  • 15.0.0
Manual Chapter

Eviction policy strategy algorithms

This table lists the BIG-IP eviction policy algorithms and associated configuration information.
In an eviction policy, you specify one or more algorithms, or any combination of algorithms, to determine how traffic flows are dropped when the eviction policy threshold limits are reached. Selected algorithms are processed at the same time as a combined strategy, not in a specific order, so the combination of algorithms determines the final strategy used to remove flows. This strategy biases or weights the final algorithm toward the outcomes you have selected, though these choices are not absolute.
You must specify at least one algorithm to use to determine how traffic is dropped with an eviction policy, otherwise flows are removed at random when the eviction policy threshold is reached.
Algorithm
Description
Bias Idle
Biases flow removal toward the existing flows that have been idle, with no payload bytes, for the longest.
Bias Oldest
Biases flow removal toward the oldest existing flows.
Bias Bytes
Biases flow removal toward the flows with the fewest bytes. When this algorithm is selected, add a value to the field
Minimum Time Delay
in the Strategy Configuration area. This value determines the period of time for which a flow is allowed to exist, at a minimum, before it is subject to removal through the Bias Bytes algorithm.
Bias Fast
Biases flow removal toward the fastest existing flows.
Bias Slow
Biases flow removal toward the slowest existing flows.
Low Priority Route Domains
Biases flow removal toward flows on low priority route domains. When this algorithm is selected, use the
Low Priority Route Domains
setting in the
Strategy Configuration
area to move low priority route domains from the
Available
list to the
Selected
list.
Low Priority Virtual Servers
Biases flow removal toward flows on low priority virtual servers. When this algorithm is selected, use the
Low Priority Virtual Servers
setting in the
Strategy Configuration
area to move low priority virtual servers from the
Available
list to the
Selected
list.
Low Priority Countries
Biases flow removal toward flows from lower priority countries. When this algorithm is selected, in the
Low Priority Countries
setting in the
Strategy Configuration
area, select low priority countries from the list and click
Add
to add them to the low priority list.
Low Priority Ports and Protocols
Biases flow removal toward flows on low priority ports and protocols. When this algorithm is selected, use the
Low Priority Ports and Protocols
setting in the
Strategy Configuration
area to add ports, protocols, and combinations to the low priority ports and protocols list (you must also specify a name).