Brocade Communications Systems ServerIron ADX 12.4.00 Service Manual download pdf (Page 134)

122 ServerIron ADX Advanced Server Load Balancing Guide

53-1002435-01

Cache Persistence using URL Hashing

system will start the second step. The second step in the process is to adjust the starting place on

the URL string by moving it by the number of characters defined by a value specified in the

<offset-value>. If the pattern string is empty, the system will not search the pattern part, and use

the beginning of URL string as the start point of the third step.

The <offset-value> is used to define how many characters will be skipped after the start point that

is defined by the pattern string. Normally this value is 0 (zero) which places the start point at the

beginning of the host string. A negative value can be used to move the starting place to the left in

the host string. If the <offset-value> is greater than the length of the rest of the URL, the system will

abort the rest of the searching steps, and start the next search (if configured). If another search

isn’t configured, the default hashing method is used. If the value of the <offset-value> variable is

within the length of the rest of the URL string, the system will skip to the offset place, and start the

third step.

With this command, the third step is for the system to look to the end of the host string to define

the string used for hashing.

Parsing using the “pattern string” with a delimiter

The following example identifies a pattern string to perform hashing on with an offset of “0” and a

delimiter value of “.”.

NOTE

Since hash-persist action is a secondary action, you must add a forward action as shown in the

following example, before adding a hash-persist action.

ServerIronADX(config)# csw-policy p1

ServerIronADX(config-csw-p1)# match r1 forward 1

ServerIronADX(config-csw-p1)# match r1 hash-persist url search-host “www.” offset

0 delimiter “.”

Syntax: [no] hash-persist url search-url <pattern-string> offset <offset-value> delimiter

<delimiter-string>

The contents of the <pattern-string> variable is the same as described in “Parsing using the

“pattern string” only”.

The contents and operation of the <offset-value> is the same as described in “Parsing using the

“pattern string” only”.

With this command, the third step is for the system to parse the URL string up-to a character

defined by the value of the <delimiter-string>. The delimiter string is used to define the end pattern

after finding the substring. If the rest of URL string has multiple delimiter strings, only the first one

will be used. If the <delimiter-string> is not found, or the value of the <delimiter-string> variable is

empty, the system will look to the end of the host string to define the string used for hashing.

Parsing using the “pattern string” with a specified string length

The following example identifies a pattern string to perform hashing on with an offset of “0” and a

length of “8”.

NOTE

Since hash-persist action is a secondary action, you must add a forward action as shown in the

following example, before adding a hash-persist action.

ServerIronADX(config)# csw-policy p1

ServerIronADX(config-csw-p1)# match r1 forward 1

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Brocade Communications Systems ServerIron ADX 12.4.00 Service Manual Page 134

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