Nortel Networks WEB OS 212777 - Manual (Page 203)

212777-A, February 2002
203
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HAPTER
8
Application Redirection
Application Redirection improves network bandwidth and provides unique network solutions.
Filters can be created to redirect traffic to cache and application servers improving speed of
access to repeated client access to common Web or application content and freeing valuable
network bandwidth.
The following topics are discussed in this chapter:
n
“Overview” on page 204 . Application redirection helps reduce the traffic congestion dur-
ing peak loads by accessing locally cached information. This section also discusses how
performance is improved by balancing cached Web requests across multiple servers.
n
“Web Cache Configuration Example” on page 206 . This section provides a step-by-step
procedure on how to intercept all Internet bound HTTP requests (on default TCP port 80)
and redirect them to the Web cache servers.
n
“RTSP Web Cache Redirection” on page 211 . This section explains how to configure the
switch to redirect data (multimedia presentations) to the cache servers and how to balance
the load among the cache servers.
n
“IP Proxy Addresses for NAT” on page 213 . This section discusses the benefits of trans-
parent proxies when used with application redirection.
n
“Excluding Noncacheable Sites” on page 215 . This section describes how to filter out
applications that keep real-time session information from being redirected to cache serv-
ers.
N OTE – To access Application Redirection functionality, the optional Layer 4 software must
be enabled on the Web switch (see “Filtering and Layer 4” in Chapter 8 of the Web OS Com-
mand Reference).