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Px Series Application Switch Installation and Configuration Guide 6-9
Persistence Modes
Figure 6-3: Hashed cookie persistence mode
Figure 6-3 shows a typical financial website named www.mybank.com. This website has
three real servers, each connected to a single backend database system. To minimize
time-consuming database “hits,” when a client makes a request of a web server, the web
server queries the backend database and caches the client data. In this example, it is
critical that the client always access the same web server that contains its cached
information. In addition, before accessing the web server, the client must login to the
site and obtain a unique cookie.
The following transactions occur in Figure 6-3:
• The website administrator of www.mybank.com sets up each web server (server 1,
server 2, and server 3) to create a cookie that contains unique identifying
information about each client.
• The website administrator configures the Px series application switch to use hashed
cookie persistence mode.
WS_003
Client
Server 1
Data session
Delivers
cookie
Sam Smith
Server 2
Database
Server 3
64.1.1.7
www.mybank.com
user=samsmith96754
A
B
C
D
F
E
G
G
E