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Chapter 4: Configuring the High-Level Network

4-50

Rule-based pool selection

Table 4.9 lists the various criteria you can use when creating a rule to select

a pool.

The following sections describe specific rule statements that you can use to

select pools for load balancing.

Note

You must define a pool before you can define a rule that references the pool.

Pool selection based on HTTP request data

A rule specifies what action the BIG-IP takes depending on whether a

question is answered true or false. A rule may either select a pool or ask

another question. For example, you may want a rule that logically states: "If

the packet data contains an HTTP request with a URI ending in cgi, then

load balance using the pool cgi_pool. Otherwise, load balance using the

pool default_pool".

Figure 4.19 shows a rule with an HTTP request variable that illustrates this

example.

Pool-selection criteria Description

Pool selection based on HTTP

request data

You can send connections to a pool or pools based on HTTP header information you

specify.

Pool selection based on IP

packet header data

You can send connections to a pool or pools based on IP addresses, port numbers,

IP protocol numbers, Quality of Service (Qos), and Type of Service (ToS) levels

defined within a packet.

Pool selection based on one

of operator

You can send connections to a pool or pools based on whether the destination

address is a member of a specific named class, such as one of AOL.

Pool selection based on HTTP

header data (Cache rule)

This type of rule is any rule that contains a cache statement. A cache rule selects a

pool based on HTTP header data. You cannot use it with FTP.

Table 4.9 The attributes you can configure for a rule

rule cgi_rule {

if (http_uri ends_with "cgi") {

use ( cgi_pool )

}

else {

use ( default_pool )

}

Figure 4.19 A rule based on an HTTP header variable

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