Lab
10.3.7.1: Optimizing
ISDN Traffic Using Compression
Objective:
To optimize the ISDN traffic between
the WestCoast router and the EastCoast router, using compression
methods.
Scenario:
Our company has analyzed the
bandwidth usage on our EastCoast to WestCoast ISDN connection. It
has been found that we are using the ISDN line to the maximum. There
is not enough money in the budget to upgrade the line to a PRI link,
or to allow the ISDN line to be on all the time. It is our
responsibility to find a way to move more information across the
link in less time. Our solution: Compression.
Lab Tasks:
Cable the lab as shown in the
diagram.
The next task is to set up the
routers and ISDN connection as in previous labs:
Configure IGRP routing with the
AS# 777. Ensure that no routing updates will be sent out of
interface BRI 0.
Configure the enable password to
be cisco.
Configure the correct IP addresses
on each of the routers.
Configure the correct ISDN switch
type. (National ISDN-1)
Configure the correct usernames
and passwords of the router to be dialed.
Configure the dialer list to
permit IP traffic.
Set up the correct static routes.
Set up the correct SPIDs on each
of the routers.
From which router prompt are SPIDs
configured?
Make sure that the encapsulation
type is PPP.
For security reasons, configure
the authentication to be CHAP.
Configure the correct timeout
values, and dialer map addresses.
Don't forget the no shutdown command
on the interfaces.
Before configuring compression on
the routers, test your configurations by pinging the other router.
This way you are insuring that your basic configuration is correct
before changing it.
The next step before adding
compression is to baseline how much information can flow across the
link. To do this, you will need a FlukeŽ meter capable of
generating network traffic and throughput tests, or some type of
network testing software that is capable of measuring line
throughput. Execute several tests on your ISDN network, to give you
a baseline of current ISDN link performance.
In the space below enter your findings on the current network
performance.
The final step is to configure
compression on the WAN interface.