Configuring cookie stickiness – Extreme Networks Px Series User Manual
Page 70
6-12
Px Series Application Switch Installation and Configuration Guide
•
A three-way TCP handshake is established between the Px series application switch
and server 3.
•
The application switch makes the following entry in its database:
•
The application switch forwards the first data request from the client to server 3 (E).
•
Server 3 sends a cookie to the client (via the application switch) (F). The cookie
contains randomly generated information that is unique for this client, such as a
session identifier:
sessionID=37654
•
The client sends another data request to
www.buystuff.com
(via the application
switch).
•
The application switch examines the source IP address of the client and looks for a
match in the database table.
•
The application switch completes the database record by entering the cookie
information:
•
Each subsequent request sent from the client to the website contains the cookie.
•
The application switch examines the cookie, looks up the forwarding information in
the database, and sends each request from this client to server 3.
Learned cookie persistence mode is based on the assumption that the client IP address
will not change between the first and second data requests sent to the website. After the
cookie is established and entered in the table, the source IP address of the client is no
longer examined, and can change as frequently as required by the ISP.
Configuring Cookie Stickiness
To configure cookie persistence you must add information to the end of the pattern-rule
definition for the default domain. This means that even if no domain or URL switching
Cookie
Source
IP Address
Destination
VIP Address
Real Server
IP Address
65.11.11.11
64.1.1.7
10.1.1.3
Cookie
Source
IP Address
Destination
VIP Address
Real Server
IP Address
sessionID=37654
65.11.11.11
64.1.1.7
10.1.1.3