Extreme Networks Px Series manual Cookie Persistence Modes, Configuring Client IP Stickiness

Persistence Modes

Configuring Client IP Stickiness

To enable and disable client IP persistence (stickiness), use the following commands:

[enable disable] sticky [L4 L7] client-ip

Client IP entries are aged out of the database in a configurable amount of time. By default, they are deleted after 30 seconds without use. To adjust these timers, use the following command:

config sticky client-ip timeout HH:MM:SS

The timer affects both layer 4 and layer 7. Valid values are in the range 00:00:05 (5 seconds) to 97:43:52. You can specify the value infinity to indicate that the stickiness should last forever.

Cookie Persistence Modes

Cookie persistence modes are layer 7 methods for establishing stickiness. When a client accesses a web server, the web server can send the client a cookie. The cookie can be programmed to contain many different pieces of information, including:

•The IP address of the web server

•A session identifier

•The expiration timer for the cookie

•Other information generated by the server

Each time the client sends a request to the server, the cookie is sent as part of the transmission. Using cookie persistence modes, the Px series application switch examines information in the cookie and uses that information to maintain the session with the appropriate web server.

The Px series application switch supports three cookie persistence modes:

•Self-identifying cookie persistence

•Hashed cookie persistence

•Learned cookie persistence

Self-Identifying Cookie Persistence Mode

Using self-identifying cookie persistence, the web server places its real IP address in the cookie. Figure 6-2 illustrates self-identifying cookie persistence mode.

Px Series Application Switch Installation and Configuration Guide 6-5