Cisco Explorer 4700 Installation Guide download pdf (Page 233)

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Device Manager Guide, Cisco ACE 4700 Series Application Control Engine Appliance

OL-26645-02

Chapter 6 Configuring Real Servers and Server Farms

Configuring Server Farms

Hash Content The ACE selects the server by using a hash value based on the specified content string of the HTTP

packet body.

1. In the Begin Pattern field, enter the beginning pattern of the content string and the pattern

string to match before hashing. If you do not specify a beginning pattern, the ACE starts

parsing the HTTP body immediate following the offset byte. You cannot configure different

beginning and ending patterns for different server farms that are part of the same traffic

classification.

Valid entries are unquoted text strings with no spaces and a maximum of 255 alphanumeric

characters. The ACE supports regular expressions for matching string expressions.

Table 12-33 lists the supported characters that you can use for matching string expressions.

2. In the End Pattern field, enter the pattern that marks the end of hashing. If you do not specify

either a length or an end pattern, the ACE continues to parse the data until it reaches the end

of the field or the end of the packet, or until it reaches the maximum body parse length. You

cannot configure different beginning and ending patterns for different server farms that are

part of the same traffic classification.

Valid entries are unquoted text strings with no spaces and a maximum of 255 alphanumeric

characters. The ACE supports regular expressions for matching string expressions.

Table 12-33 lists the supported characters that you can use for matching string expressions.

3. In the Length field, enter the length in bytes of the portion of the content (starting with the

byte after the offset value) that the ACE uses for sticking the client to the server. Valid entries

are integers from 1 to 1000 bytes.

The offset and length can vary from 0 to 1000 bytes. If the payload is longer than the offset

but shorter than the offset plus the length of the payload, the ACE sticks the connection based

on that portion of the payload starting with the byte after the offset value and ending with the

byte specified by the offset plus the length. The total of the offset and the length cannot exceed

1000.

You cannot specify both the length and the end-pattern options for a Hash Content predictor.

4. In the HTTP Content Offset field, enter the portion of the content that the ACE uses to stick

the client on a particular server by indicating the bytes to ignore starting with the first byte of

the payload. Valid entries are integers from 0 to 999 bytes. The default is 0, which indicates

that the ACE does not exclude any portion of the content.

Hash Cookie The ACE selects the server by using a hash value based on the cookie name.

In the Cookie Name field, enter a cookie name in the form of an unquoted text string with no

spaces and a maximum of 64 characters.

Hash Secondary

The ACE selects the server by using the hash value based on the specified cookie name in the URL

query string, not the cookie header.

In the Cookie Name field, enter a cookie name in the form of an unquoted text string with no

spaces and a maximum of 64 characters.

Table 6-7 Predictor Method Attributes (continued)

Predictor Method Description / Action

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