Brocade Communications Systems ServerIron ADX 12.4.00 Service Manual download pdf (Page 85)

ServerIron ADX Advanced Server Load Balancing Guide 73

53-1002435-01

Content aware cache switching

Syntax: csw-rule r1 url prefix | suffix | pattern"<selection-criteria>"

Syntax: csw-policy <policy-name>

Syntax: match r1 forward <server-group-id>

Syntax: default forward<server-group-id>

The csw-rule r1 url suffix gif command consists of two parts. The first part specifies what kind of

matching the policy does on the selection criteria. Three kinds of matching methods are supported:

• The prefix keyword compares the selection criteria to the beginning of the URL string.

• The suffix keyword compares the selection criteria to the end of the URL string.

• The pattern keyword looks for the selection criteria anywhere within the URL string.

The second part of the specifies the selection criteria, which can be up to 80 characters in length;

In this example, the selection criteria is the text string "gif". Since the matching method is suffix, the

policy looks at the end of the URL string. If the URL string ends with the text "gif", then the URL

string meets the selection criteria.

NOTE

In addition to using text as selection criteria, you can use an asterisk (*) as a wildcard character to

specify one or more characters at the end of a URL string. For example, using "/ho*" as the selection

criteria matches /home, /hotels, and /home/main/index.html.

If you are using the suffix matching method, you cannot use an asterisk (*) as a wildcard character.

The asterisk wildcard character is valid for the prefix and pattern matching methods only.

The csw-policy p1 command sets the name of the policy.

If the URL string meets the selection criteria, the second part of the match command specifies

what to do with the HTTP request. In this example, the 1 in the command causes the HTTP request

to be sent to the cache server group whose ID = 1. Specifying 0 in the match command causes the

request to be directed to the Internet. A CSW policy can contain multiple match commands, each

with different selection criteria.

The default forward 2 command specifies what happens when the URL string does not meet any of

the selection criteria in a CSW policy’s match command. With a match command, you can specify a

server group ID number. In this example, if a URL string does not match the selection criteria in

policy p1, it is sent to group-id 2 for evaluation.

NOTE

As the diagram in Figure 19 illustrates, there is only one cache server in server group ID = 2. Even

so, the match command must refer to a server group, rather than an actual cache server. Server

groups can consist of one or more cache servers.

Configuring the cache servers

The cache servers return the content to the requesting clients. When configuring content aware

cache switching, you place the cache servers into logical server groups. CSW policies direct HTTP

requests to one of the cache servers in these logical groups.

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Brocade Communications Systems ServerIron ADX 12.4.00 Service Manual Page 85