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Web OS 10.0 Application Guide
428
Chapter 16: Persistence
212777-A, February 2002
Passive Cookie Mode
In Passive Cookie mode, when the client first makes a request, the switch selects the server
based on the load-balancing metric. The real server embeds a cookie in its response to the cli-
ent. The switch records the cookie value and matches it in subsequent requests from the same
client.
NOTE – The passive cookie mode is recommended for temporary cookies. However, you can
use this mode for permanent cookies if the server is embedding an IP address.
The following figure shows passive cookie mode operation:
Figure 16-3 Passive Cookie Mode
Subsequent requests from Client 1 with the same cookie value will be sent to the same real
server (RIP 1 in this example).
Internet
1. Configure server to send cookies
2. Configure switch to record cookie values
Web Server
Farm
Client
Web Switch
Proxy Firewall
3. Client visits the web site
4. Switch selects
cookie server
5. Server returns
cookie value
6. Switch registers cookie value and forwards it
to the client for use in subsequent requests