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CHAPTER

7-1

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

OL-26645-02

Configuring Stickiness

This chapter provides an information about sticky behavior and procedures for configuring stickiness

with an ACE appliance.

Note When you use the ACE CLI to configure named objects (such as a real server, virtual server, parameter

map, class map, health probe, and so on), consider that the Device Manager (DM) supports object names

with an alphanumeric string of 1 to 64 characters, which can include the following special characters:

underscore (_), hyphen (-), dot (.), and asterisk (*). Spaces are not allowed.

If you use the ACE CLI to configure a named object with special characters that the DM does not

support, you may not be able to configure the ACE using DM.

This chapter contains the following sections:

• Stickiness Overview, page 7-1

• Configuring Sticky Groups, page 7-11

• Configuring Sticky Statics, page 7-21

Stickiness Overview

When customers visit an e-commerce site, they usually start out by browsing the site, the Internet

equivalent of window shopping. Depending on the application, the site may require that the client

become “stuck” to one server once the connection is established, or the application may not require this

until the client starts to build a shopping cart.

In either case, once the client adds items to the shopping cart, it is important that all of the client requests

get directed to the same server so that all the items are contained in one shopping cart on one server. An

instance of a customer's shopping cart is typically local to a particular Web server and is not duplicated

across multiple servers.

E-commerce applications are not the only types of applications that require stickiness. Any Web

application that maintains client information may require stickiness, such as banking applications or

online trading. Other uses include FTP and HTTP file transfers.

Stickiness allows the same client to maintain multiple simultaneous or subsequent TCP or IP

connections with the same real server for the duration of a session. A session, as used here, is defined

as a series of transactions between a client and a server over some finite period of time (from several

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