7-2
User
Guide

for

the

Cisco

Application

Networking

Manager

5.2
OL-26572-01
Chapter
7






Configuring

Virtual

Servers
Configuring
Virtual

Servers

•
Real
servers—See
Configuring
Real

Ser

vers,

page
8-5
.

•
Server
farms—See
Configuring
Ser

ver

Farms,

page
8-30
.

•
Predictor
methods—See
Configuring
the

Predictor

Method
for
Server

Farms,

page
8-39

•
Health
probes—See
Configuring
Health

Monitoring

for

Real

Servers,

page
8-51

•
Sticky
groups—See
Configuring
Sticky

Groups,

page
9-7
.

•
Parameter
maps—See
Configuring
Parameter

Maps,

page
10-1
.
Configuring
Virtual

Servers
In
a

load-balancing

environment,

a

virtual

server

is

a

construct

that

allows

multiple

physical

servers

to
appear
as

one

for

load-balancing

purposes.

A

virtual

server

is

bound

to

physical

services

running

on

real
servers
in

a

server

farm

and

uses

IP

address

and

port

information

to

distribute

incoming

client

requests
to
the

servers

in

the

server

farm

according

to

a

specified

load-balancing

algorithm.
You
use

class

maps

t

o

configure

a

vi

rtual

server

address

and

definition.

The

load-balancing

predictor
algorithms
(for

example,

round-robin,

least

connections,

and

so

on)

determine

the

servers

to

which

the
ACE
sends

connection

requests.
This
section

includes

the

following

topics:

•
Virtual
Server
Configuration

and

ANM,

page
7-2

•
Information
About

Using

ANM

to

Configure

Virtual

Servers,

page
7-4

•
Virtual
Server

Usage

Guidelines,

page
7-5

•
Virtual
Server

Testing

and

Troubleshooting,

page
7-6

•
Virtual
Server

Configuration

Procedure,
page
7-7
Virtual
Server

Configuration

and

ANM
This
section

identifies

the

constraints

and

framework

used

by

ANM

for

virtual

server

configuration.
In
ANM,

a

virtual

server

has

the

following

attributes:

•
A
single

Layer

3/

Layer

4

ma

tch

condition
You
can

specify

only

a

si

ngle

IP

address

(or

single

IP

address

range

if

an

IPv4

netmask

or

IPv6
prefix
length

is

used),

with

onl

y

a

si

ngle

port

(or


port

range).

A

si

ngle

match

condition

greatly
simplifies
and

aids

virtual

server

configuration.
Note
IPv6
requires

ACE

module

and

ACE

appliance

software

Version

A5(1.0)

or

later.

•
A
default

Layer

7

ac

tion

•
A
Layer

7

policy

map

•
A
Layer

3/Layer

4

class
map

•
A
single
multimatch
policy
map,
a

class-map
match,
and
an

action
Virtual
server

attributes

also

include

the

following:

•
The
virtual

server
multimatch
policy
map
is
associated

with
an
interface

or

is

global.