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Glossary

BIG-IP® Reference Guide Glossary - 11

Predictive mode

Predictive mode is a dynamic load balancing mode that bases connection

distribution on a combination of two factors: the server that currently hosts

the fewest connections, and also has the fastest response time. Predictive

mode also ranks server performance over time, and passes connections to

servers which exhibit an improvement in performance rather than a decline.

rate class

You create a rate filter from the Configuration utility or command line

utility. When you assign a rate class to a rate filter, a rate class determines

the volume of traffic allowed through a rate filter. See also rate filter.

rate filter

Rate filters consist of a basic filter with a rate class. Rate filters are a type of

extended IP filter. They use the same IP filter method, but they apply a rate

class, which determines the volume of network traffic allowed through the

filter. See also rate class.

ratio

A ratio is a parameter that assigns a weight to a virtual server for load

balancing purposes.

Ratio mode

The Ratio load balancing mode distributes connections across an array of

virtual servers in proportion to the ratio weights assigned to each individual

virtual server.

receive expression

A receive expression is the text string that the BIG-IP looks for in the web

page returned by a web server during an extended content verification

(ECV) health check.

redundant system

Redundant system refers to a pair of BIG-IP units that are configured for

fail-over. In a redundant system, there are two units, one running as the

active unit and one running as the standby unit. If the active unit fails, the

standby unit takes over and manages connection requests.

remote administrative IP address

A remote administrative IP address is an IP address from which a BIG-IP

allows shell connections, such as Telnet or SSH.

remote server acceleration

A remote server acceleration configuration is a configuration in which a

BIG-IP Cache Controller redundant system uses content-aware traffic

direction to enhance the efficiency of an array of cache servers that cache

content for a remote web server.

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