Cisco Explorer 4700 Installation Guide download pdf (Page 293)

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

OL-26645-02

Chapter 7 Configuring Stickiness

Configuring Sticky Groups

Layer 4 Payload Sticky Group Attributes

Table 7-6 Layer 4 Payload Sticky Group Attributes

Field Description

Offset (Bytes) Enter the number of bytes the virtual server is to ignore starting with the first

byte of the cookie. Valid entries are integers from 0 to 999. The default is 0

(zero), which indicates that the virtual server does not exclude any portion

of the cookie.

Length (Bytes) Enter the length of the portion of the cookie (starting with the byte after the

offset value) that the ACE is to use for sticking the client to the server. Valid

entries are integers from 1 to 1000.

Begin Pattern Enter the beginning pattern of the Layer 4 payload and the pattern string to

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

begins parsing immediately after 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. You can enter a text string with spaces provided

that you enclose the entire string in quotation marks ("). The ACE supports

regular expressions for matching string expressions. Table 12-33 lists the

supported characters that you can use for matching string expressions.

End Pattern Enter the pattern that marks the end of hashing. If you do not specify an end

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

end of the field or 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. You can enter a text string with spaces provided

that you enclose the entire string in quotation marks ("). The ACE supports

regular expressions for matching string expressions. Table 12-33 lists the

supported characters that you can use for matching string expressions.

Enable Sticky For

Response

Check the check box to enable the ACE to parse server responses and

perform sticky learning. The ACE uses a hash of the server response bytes

to populate the sticky database. The next time that the ACE receives a client

request with those same bytes, it sticks the client to the same server.

Clear the check box to reset the behavior of the ACE to the default of not

parsing server responses and performing sticky learning.

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