Nortel Networks WEB OS 212777 - Manual (Page 438)

Web OS 10.0 Application Guide
438 n Chapter 16: Persistence
212777-A, February 2002
Figure 16-5 illustrates persistence based on SSL session ID as follows:
1. An SSL Hello handshake occurs between Client 1 and Server 1 via the Web switch.
2. An SSL session ID is assigned to Client 1 by Server 1.
3. The Web switch records the SSL session ID.
4. The Web switch selects a real server based on the existing SLB settings.
As a result, subsequent connections from Client 1 with the same SSL session ID are directed to
Server 1.
Figure 16-5 SSL Session ID-Based Persistence
5. Client 2 appears to the switch to have the same source IP address as Client 1 because they
share the same proxy firewall.
However, the Web switch does not automatically direct Client 2 traffic to Server 1 based on the
source IP address. Instead an SSL session ID for the new traffic is assigned. Based on SLB set-
tings, the connection from Client 2 is spliced to Server 3.
As a result, subsequent connections from Client 2 with the same SSL session ID are directed to
Server 3.
Internet
Web Server
Farm
Client 1
Client 2
Firewall