Avaya P333R-LB Application Manual page 8

A p p l i c a t i o n 3 — A p p l i c a t i o n
R e d i r e c t i o n
Application redirection is the diversion of traffic
from certain applications to a different direction
than the original one without the user/source
being aware or requiring any reconfiguring.
Cache Redirection: One of the most common uses
of application redirection is "cache redirection."
Today, many organizations use proxy servers
for Internet access. This approach, however, has
problems which makes it less than ideal:
• It is only possible to deploy a single proxy
server which is both a bottleneck and a single
point of failure.
• The network manager needs to configure each
user to access the Internet via the proxy server IP.
• Users can bypass the proxy without supervision.
Gigabit Ethernet
with LAG
LAN
Solution to the Problem: With cache redirection, the
user does not need to configure anything: they are
convinced they are accessing the Internet directly.
Load balancing identifies Internet traffic, "snatches"
the packets and diverts them to the cache.
The cache server checks whether the information is
in its memory. If it is not, the cache server retrieves
the information from the Internet. The cache server
then forwards the information to the user who is
unaware of the entire process.
It is possible to deploy more than one server and
to implement Server load balancing among them
(see also Application 1—Server Load Balancing).
Avaya P333R-LB
VRRP
Cache Cache
Server Farm Server Farm
a.com
b.com
c.com
...
Avaya P333R-LB
WAN Router
Internet
a.com
Communication without boundaries
c.com
b.com
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