Riverbed LAB 1.doc

8/10/2019 Riverbed LAB 1.doc

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Lab 1: Switch vs Hub

Objective

This lab teaches the differences between using a Hub or a switch in a LAN using Riverbed Modeler 17.5.

In this lab the student will create a LAN with a hub and then re!lace the hub with the switch. The student will thene"a#ine the change in through!ut and dela$ in the LAN when u!grading fro# a hub to a switch.

Overview

%thernet hubs wor& at the !h$sical la$er si#!l$ re!eating an$ fra#es the$ receive on one !ort onto all other !orts. 'orthis reason the$ are also called #ulti!ort re!eaters. Hubs are la$er 1 devices. All the nodes connected to a hub areconsidered to be !art of the sa#e broadcast do#ain. In other words an$ fra#e trans#itted b$ one of the nodes will bereceived b$ all the rest. This configuration can li#it through!ut as all nodes #ust share the ca!acit$ of the LAN.

(n the other hand switches are la$er ) devices and hence forward fra#es onl$ to the !ort that is connected to theethernet fra#e*s destination. +ince switches forward fra#es onl$ on a single line the$ create #ulti!le broadcast do#ainsleading to great gains in through!ut. The through!ut of a switch is restricted however b$ its !rocessing s!eed the s!eedat which it can forward fra#es onto the correct outgoing lin&.

NOTE 1: Remember to save your models in you P Drive. You do not have access to save in the C drive. To load yoursaved models, you need to add your P drive in the models directory.

NOTE : Do not !o and chan!e anythin! in the "rocess model. Your models #ill sto" com"ilin!

Lab Instructions

Step 1: LAN using Hubs

,reate $our LAN using the hub and the ethernet wor&stations.

1. ,lic& +tart - Riverbed #odeler acade#ic edition 17.5 - Riverbed #odeler 17.5

a. NOTE: it will take some time to load. DO NOT PRESS IT AGAIN

). ou will see the license agree#ent / Accept it

0. ou will now see the #odeller.

. To create a new !ro2ect clic& on File New. ou will see the following dialog bo".

5. +elect 3ro2ect and 3ress ok.

4. ou !ro2ect editor wor&s!ace will o!en now. %nter !ro2ect na#e as LA1and change scenario na#e to onl!hubs6

7. 'ro# the ne"t dialog bo" select "reate e#pt! scenario6 and !ress Ne$t

. 'ro# the ne"t dialog bo" select "a#pus6 and !ress Ne$t

8. 9on*t change the si:e 2ust !ress Ne$t.

1;. 9on*t select an$ technolog$ 2ust !ress Ne$t.

11. The setu! is co#!lete. 3ress Finish

1). ou will now be able to see the ob2ect !alette and the 3ro2ect wor&s!ace

Now $ou will learn a


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15. +et the ,enter Node Model to ethernet)*+hub.

14. +et the 3eri!her$ Node Model to ethernet+wkstn.

17. +et the Lin& Model to 1,ase% and set the Nu#ber to 1*.

1. ,lic& O-to create the LAN.

18. ou shold now see the following LAN created.

);. Now add an .thernet serverfro# the ob2ect !alette and connect it to the hub using a 1,ase%lin&.

)1. Now add an application con(igurationand a pro(ile con(igurationob2ects fro# the ob2ect !alette.

a. ,onfigure the web a!!lication to heav$ browsing. ,hange the ob2ect si:e to 1,,,,b!tesand change thei#age to large i#age

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b. ,reate a !rofile for this a!!lication and a!!l$ it to each wor&station. Right=clic& on an$ of the station andchoose +elect +i#ilar Nodes. Ne"t right clic& on one of the stations and choose %dit Attributes. 3ut achec& in the chec&bo" ne"t to A!!l$ ,hanges to +elected (b2ects. And now add the !rofile.

)). ou networ& should loo& li&e this.

)0. Now select the statistics $ou want to collect.

a. +elect the +i#ulation tab,hoose Individual +tatistics>

b. %"!and the Node +tatistics ite# and select? ,lient htt! +erver htt! and %thernet

c. %"!and the @lobal +tatistics ite# and the %thernet ite# and select the 9ela$

d. ,lic& on ( to close the window.

). Now run the si#ulation for 1; #inutes.

)5. ,hec& $our results.

Step *: LAN using a Switch

1. 9u!licate the +cenario

a. ,hoose Scenarios/uplicate Scenario and na#e the new scenario Onl! Switch.

b. ,lic& on O-to create the scenario.

). &ight0click on the hub and choose .'it Attributes. Left clic& on the #odel attribute and chooseenthernet1+switch+a'vfro# the !ull=down #enu.

0. Also change the na#e to be Switch.

. ,lic& on O-to #a&e the change.

5. Now $ou should get the scenario li&e the following?

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4. Run +i#ulation and ,o#!are Results

a. +elect the Scenariostab2anage Scenarios

b. %dit the Results field in both rows and set the values to BcollectC or BrecollectC

c. ,lic& on O-to run both scenarios. Dhen the si#ulation is co#!leted clic& on "loseto close the window.

7. To co#!are the result select the &esulttab"o#pare &esults

. %"!and the %ra((ic Sinkand select the %ra((ic &eceive'statistics. Eiew the statistics in As Is #ode. ,lic& on+how for a #ore detailed gra!h. This statistics shows the total of traffic received b$ all stations in the LAN. 'ro#the result we can see that the switch can al#ost handle twice traffic as #uch as the hub.

Lab 3uestions:

3uestion Lab141: ,o#!are the average HTT3 (b2ect Res!onse Ti#e and HTT3 3age Res!onse Ti#e for an$wor&station for the two scenarios. %"!lain $our results.

3uestion Lab14*:,o#!are the average ,ollision ,ount and the average Trans#ission Atte#!ts for an$ wor&station forthe two scenarios. %"!lain $our results.

3uestion Lab14):,o#!are the average traffic !rocessing ti#e and the average load on the web server for the twoscenarios. %"!lain $our results.

3uestion Lab145:,o#!are the @lobal %thernet dela$ for the two scenarios. %"!lain $our results.

The results graphs and eplanations !or these "uestions need to #e su#mitted in the la# report.

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Step ): switch an' hubs in the LAN

Now create a new scenario for the following networ&

Run the si#ulation and co#!are the results with the !revious scenarios.

Lab 3uestions:

3uestion Lab146:,o#!are the average HTT3 (b2ect res!onse ti#e and the average HTT3 !age res!onse for nodeF1for the three scenarios. %"!lain $our results.

3uestion Lab14:,o#!are the average ,ollision count and the average trans#ission atte#!ts for nodeF7 for the threescenarios. %"!lain $our results.

3uestion Lab147:,o#!are the average %thernet dela$ and for nodeF4 for the three scenarios. %"!lain $our results.

3uestion Lab148:,o#!are the average load and the average traffic !rocessing ti#e for the web server for the threescenarios. %"!lain $our results.




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Step 5: Heav! application

1. 'or the three scearnios defined before u!date the a!!lication

a. ,onfigure the web a!!lication to heav$ browsing. ,hange the ob2ect si:e to 16,,,, b!tesand change

the i#age to large i#age 9with #ini#u# outco#e set to *,,,, an' #a$i#u# outco#e to 1,,,,,

). Run the si#ulation and co#!are the results with the !revious scenarios.

Lab 3uestions:

3uestion Lab14;:,o#!are the @lobal HTT3 (b2ect res!onse ti#e and the HTT3 !age res!onse for the three scenarios%"!lain $our results.

3uestion Lab141,:,o#!are the @lobal %thernet dela$ for the three scenarios. %"!lain $our results.



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Riverbed LAB 1.doc