Nortel Networks WEB OS 212777 - Manual (Page 372)

Web OS 10.0 Application Guide
372 n Chapter 15: Content Intelligent Switching
212777-A, February 2002
Overview
Alteon Web switches performs content intelligent switching by processing numerous tasks for
each incoming session, including connection setup, traffic parsing, applying server selection
algorithms, splicing connections and translating session addresses, metering and controlling
server bandwidth usage, processing traffic filters, collecting statistics, and so on.
Figure 15-1
illustrates the process of content intelligent switching in the Web switch.
Figure 15-1 Content Intelligent Load Balancing Example
Client requests
a Web page 1. Requests for static
data go to caches
Requests for dynamic
data go to servers
Client sends an
HTTP request 3.
Switch completes 3-way
handshake with client 2.
Switch parses the HTTP request
and forwards based on header
and URL information 4.
Switch gets response,
adjusts the sequence
numbers in the TCP Header,
and forwards the packet
to the client 6.
Web server receives
the HTTP request and
responds 5.
File types:
"images"
".gif"
".jpg"
".html"
File types:
".cgi"
".bin"
".exe"
Internet