Cisco Explorer 4700 Installation Guide download pdf (Page 234)

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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 Header The ACE selects the server by using a hash value based on the header name.

In the Header Name field, select the HTTP header to be used for server selection:

• To specify an HTTP header that is not one of the standard HTTP headers, select the first radio

button and enter the HTTP header name in the Header Name field. Valid entries are unquoted

text strings with no spaces and a maximum of 64 characters.

• To specify one of the standard HTTP headers, select the second radio button, then select one

of the HTTP headers from the list.

Hash Layer4 The ACE selects the server by using a Layer 4 generic protocol load-balancing method. Use this

predictor to load balance packets from protocols that are not explicitly supported by the ACE.

1. In the Begin Pattern field, 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 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 payload (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 end-pattern options for a Hash Layer 4 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.

Table 6-7 Predictor Method Attributes (continued)

Predictor Method Description / Action

1 ... 233 234 235 ... 648

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