8-41
User
Guide

for

the

Cisco

Application

Networking

Manager

5.2
OL-26572-01
Chapter
8






Configuring

Real

Servers

and

Server

Farms
Configuring
Server

Farms
Hash
Content
Server
selection

method

that

uses

a

hash

value

based

on

the

specified

content

string

of

the

HTTP

packet
body.
Do

the

following:
a.
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

spa

ces

and

a

maximum

of

255


alphanumeric
characters.
The

ACE

supports

regular

expressions

for

matching

string

expressions.

Ta

b

l

e


14-33

lists
the
supported

characters

that

you

c

an

use

for


matching

string

expressions.
b.
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

ar

e

part

of

t

he

same

traffic
classification.
Valid
entries

are

unquoted

text

strings

with

no

spa

ces

and

a

maximum

of

255


alphanumeric
characters.
The

ACE

supports

regular

expressions

for

matching

string

expressions.

Ta

b

l

e


14-33

lists
the
supported

characters

that

you

c

an

use

for


matching

string

expressions.
c.
In
the

Length

(Bytes)
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
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
t

han

the

offset

pl

us

the

l

ength

of

t

he

payload,

the

ACE

sticks

the

connection

based

on

t

hat
portion
of

the

payload

starting

with

the

byte

after

the

offset

value

and

ending

with

the

byte

specified
by
the

offset

pl

us

the

l

ength.

The

total

of

the

offset

and

the

length

cannot

exceed

1000.
Note
You
cannot

specify

both

the

length

and

the

end-pattern

options

for

a

Hash

Content
predictor.
d.
In
the

HTTP

Content

Offset

(Bytes)

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
Server
selection

method

that

uses

a

ha

sh

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

c

haracters.
Hash
Header
Server
selection

method

that

uses

a

ha

sh

value

based

on

the

header

name.
In
the

Header

Name

field,

choose

the

HTTP

header

to

be

used

for

server

selection

as

follows:

•
To
specify
an

HTTP

header

that

is

not

one

of

the

standard

HTTP

headers,

click

the

first

radio

button
and
enter

the

HTTP

header

name

in

the

Header

Name

field.

Valid

entries

are

unquoted

text

strings
with
no

spa

ces

and

a

maximum

of

64

c

haracters.

•
To
specify

one

of

the

standard

HTTP

headers,

click

the

second

radio

button,

and

then
choose
one
of
the

HTTP

headers

from

the

list.
Table
8-9
Predictor
Method

Attributes

(continued)
Predictor
Method
Description
/

Action