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Copyright 2011 Kenneth M. Chipps Ph.D.

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1 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Lab How to Use GNS3 Last Update 1.0.0 Copyright 2011 Kenneth M. Chipps Ph.D.

2 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Dynamips The main program used here is Dynamips This program allows a PC to run a native Cisco IOS just as if it were running inside of a Cisco router It does this by emulating the Cisco router’s hardware just as virtualization programs do Copyright 2011 Kenneth M. Chipps Ph.D.

3 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Dynamips Then the standard Cisco IOS image file runs just as if it were running on a real Cisco router According to Dynamips the following routers are emulated However, later we will see that GNS3 lists additional routers as being supported This is due to the lack of updates to the Dynamips web site I suspect Copyright 2011 Kenneth M. Chipps Ph.D.

4 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Dynamips 7200 3600 series 3700 series 2600 series to 2650XM 2691 Dynamips says these modules, as these are modular interfaces routers, are supported Copyright 2011 Kenneth M. Chipps Ph.D.

5 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Dynamips 7200 Port Adapters FastEthernet Cards C7200-IO-FE PA-FE-TX C7200-IO-2FE PA-2FE-TX GigabitEthernet Cards C7200-IO-GE-E PA-GE Copyright 2011 Kenneth M. Chipps Ph.D.

6 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Dynamips Ethernet Cards PA-4E PA-8E ATM Card PA-A1 Serial Cards PA-4T+ PA-8T Packet over Sonet Card PA-POS-OC3 in experimental mode, only works with recent IOS images Copyright 2011 Kenneth M. Chipps Ph.D.

7 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Dynamips 3600 Series Ethernet cards NM-1E NM-4E NM-1FE-TX Ethernet Switching Module NM-16ESW Serial Card NM-4T Copyright 2011 Kenneth M. Chipps Ph.D.

8 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Dynamips 2691/3725/3745 Routers FastEthernet Cards NM-1FE-TX Ethernet Switching Module NM-16ESW Serial Card NM-4T Copyright 2011 Kenneth M. Chipps Ph.D.

9 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Dynamips 2600 Series Ethernet cards NM-1E NM-4E NM-1FE-TX Ethernet Switching Module NM-16ESW Copyright 2011 Kenneth M. Chipps Ph.D.

10 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Dynamips Dynamips does not support Cisco switches as the ASIC based devices cannot yet be emulated in it It does support switching through switch modules in some routers Also later we will see a basic switch is included in the GNS3 implementation Copyright 2011 Kenneth M. Chipps Ph.D.

11 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Dynamips 12.4T is the latest IOS mentioned as being able to run on it The main web site for Dynamips is Copyright 2011 Kenneth M. Chipps Ph.D.

12 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Dynagen Dynagen is a front end for Dynamips that allows for the devices being emulated to be defined in text based ini files The main web site for Dynagen is Copyright 2011 Kenneth M. Chipps Ph.D.

13 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Support Site The main support site for these two is Copyright 2011 Kenneth M. Chipps Ph.D.

14 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
GNS3 GNS3 is a GUI front end to Dynagen that eases the creation of the ini files used by Dynagen to talk to Dynamips The main site for GNS3 is The only program that needs to be installed for this lab is the GNS3 all in one file from the GNS3 web site Copyright 2011 Kenneth M. Chipps Ph.D.

15 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Install GNS3 The tutorial available from the GNS3 web site does an excellent job of explaining how to use this program These instructions are copied here word for word for the most part As it says Copyright 2011 Kenneth M. Chipps Ph.D.

16 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Install GNS3 Step 1: Download GNS3 Use your Web browser to access Click on the green Download button The easiest way to install GNS3 in a Windows environment is to use the top file GNS3-0.5-win32-all-in-one.exe Copyright 2011 Kenneth M. Chipps Ph.D.

17 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Install GNS3 Copyright 2011 Kenneth M. Chipps Ph.D.

18 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Install GNS3 Copyright 2011 Kenneth M. Chipps Ph.D.

19 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Install GNS3 Copyright 2011 Kenneth M. Chipps Ph.D.

20 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Install GNS3 Copyright 2011 Kenneth M. Chipps Ph.D.

21 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Install GNS3 Copyright 2011 Kenneth M. Chipps Ph.D.

22 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Install GNS3 Copyright 2011 Kenneth M. Chipps Ph.D.

23 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Install GNS3 Copyright 2011 Kenneth M. Chipps Ph.D.

24 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Install GNS3 Step 2 Install GNS3 Find the file you downloaded and double-click on it to begin installing GNS3 The GNS3 Setup Wizard will begin Click the Next button GNS3 depends on several other programs to operate Those dependencies include WinPCap, Dynamips, and Pemuwrapper Copyright 2011 Kenneth M. Chipps Ph.D.

25 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Install GNS3 These components along with GNS3 are all chosen by default for installation, so just click the Next button to continue Click the I Agree button to continue Install all of these as they are encountered Copyright 2011 Kenneth M. Chipps Ph.D.

26 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Start GNS3 Run GNS3 from where ever you placed it Copyright 2011 Kenneth M. Chipps Ph.D.

27 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Setup GNS3 Step 3 Defining Cisco IOS files As mentioned earlier, you must provide your own Cisco IOS to use with GNS3 due to licensing issues GNS3 is meant to be used in a lab environment for testing and learning Once you have obtained your own copy of a Cisco IOS for one of the supported platforms, you are ready to continue Copyright 2011 Kenneth M. Chipps Ph.D.

28 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Setup GNS3 Current platforms supported include 1710 1720 1721 1750 1751 1760 Copyright 2011 Kenneth M. Chipps Ph.D.

29 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Setup GNS3 2610 2610XM 2611 2611XM 2620 2620XM 2621 2621XM 2650XM 2651XM 2691 Copyright 2011 Kenneth M. Chipps Ph.D.

30 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Setup GNS3 3620 3640 3660 3725 3745 7200 Copyright 2011 Kenneth M. Chipps Ph.D.

31 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Finding an IOS A small digression concerning acquiring a Cisco IOS for use by Dynamips is needed here Copyright 2011 Kenneth M. Chipps Ph.D.

32 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Finding an IOS Dynamips requires a real Cisco IOS to work There is no legal way to obtain such an IOS, since the IOS is sold with a physical router for use on that physical router only Cisco knows that these IOSs are being used in Dynamips To date they have expressed no view on this Copyright 2011 Kenneth M. Chipps Ph.D.

33 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Finding an IOS There has been considerable pressure from the user community on Cisco for them to create an educational IOS for this sort of use At present everyone seems to know what is going on and everyone, including Cisco, has chosen to just ignore it for now Copyright 2011 Kenneth M. Chipps Ph.D.

34 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Finding an IOS After all the more people who know how to use Cisco devices, the more of these will be sold To acquire a legal copy of a Cisco IOS a login to their web site is required With such a login here is one way to find and download an IOS that supports MPLS Copyright 2011 Kenneth M. Chipps Ph.D.

35 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Finding an IOS First, find the product bulletin for the router series you want to use in Dynamips that discusses the feature sets supported by the different subtypes of the current version of the IOS for this router In this example a Cisco 2621XM router will be used A search on Cisco’s web site for 2621XM feature set Copyright 2011 Kenneth M. Chipps Ph.D.

36 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Finding an IOS Produces this result with the second hit being what we want Copyright 2011 Kenneth M. Chipps Ph.D.

37 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Finding an IOS Copyright 2011 Kenneth M. Chipps Ph.D.

38 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Finding an IOS Click on this link Here is what appears Copyright 2011 Kenneth M. Chipps Ph.D.

39 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Finding an IOS Copyright 2011 Kenneth M. Chipps Ph.D.

40 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Finding an IOS Search the document for MPLS This table appears Copyright 2011 Kenneth M. Chipps Ph.D.

41 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Finding an IOS Copyright 2011 Kenneth M. Chipps Ph.D.

42 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Finding an IOS Scroll down a little Notice that only four of the feature sets for this IOS version support MPLS In this case we will use the Advanced IP Services feature set The next step is to go download this Return to the Cisco home page Copyright 2011 Kenneth M. Chipps Ph.D.

43 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Finding an IOS Copyright 2011 Kenneth M. Chipps Ph.D.

44 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Finding an IOS Click on Support in the menu bar Copyright 2011 Kenneth M. Chipps Ph.D.

45 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Finding an IOS Copyright 2011 Kenneth M. Chipps Ph.D.

46 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Finding an IOS Enter 2621XM in the Find box Click Find Copyright 2011 Kenneth M. Chipps Ph.D.

47 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Finding an IOS Copyright 2011 Kenneth M. Chipps Ph.D.

48 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Finding an IOS Here is the result Copyright 2011 Kenneth M. Chipps Ph.D.

49 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Finding an IOS Copyright 2011 Kenneth M. Chipps Ph.D.

50 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Finding an IOS Click on the Cisco 2621XM Multiservice Router line This page appears Copyright 2011 Kenneth M. Chipps Ph.D.

51 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Finding an IOS Copyright 2011 Kenneth M. Chipps Ph.D.

52 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Finding an IOS Click on Software on Chassis This page appears Copyright 2011 Kenneth M. Chipps Ph.D.

53 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Finding an IOS Copyright 2011 Kenneth M. Chipps Ph.D.

54 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Finding an IOS Click on IOS Software This page appears Copyright 2011 Kenneth M. Chipps Ph.D.

55 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Finding an IOS Copyright 2011 Kenneth M. Chipps Ph.D.

56 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Finding an IOS Scroll down until you see Advanced IP Services Then click on Download Now Copyright 2011 Kenneth M. Chipps Ph.D.

57 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Finding an IOS Copyright 2011 Kenneth M. Chipps Ph.D.

58 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Finding an IOS This page appears Click on Proceed with Download Then Agree And Download The download commences Copyright 2011 Kenneth M. Chipps Ph.D.

59 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Finding an IOS Copyright 2011 Kenneth M. Chipps Ph.D.

60 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Finding an IOS Copyright 2011 Kenneth M. Chipps Ph.D.

61 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Finding an IOS Copyright 2011 Kenneth M. Chipps Ph.D.

62 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Finding an IOS Copyright 2011 Kenneth M. Chipps Ph.D.

63 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Finding an IOS Copyright 2011 Kenneth M. Chipps Ph.D.

64 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Start GNS3 Start GNS3 This reminder appears the first time Click Ok Copyright 2011 Kenneth M. Chipps Ph.D.

65 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Start GNS3 Copyright 2011 Kenneth M. Chipps Ph.D.

66 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Start GNS3 Here is the main GNS3 screen Copyright 2011 Kenneth M. Chipps Ph.D.

67 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
GNS3 GUI Copyright 2011 Kenneth M. Chipps Ph.D.

68 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
GNS3 GUI Copyright 2011 Kenneth M. Chipps Ph.D.

69 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Load the Cisco IOS First load the IOS image On the Edit menu, choose IOS image and hypervisors Under the IOS Images tab, click the … box beside Image file and then find your Cisco IOS file and click Save The file will appear as your image file Next, click the drop-down arrow next to Platform to select the platform that corresponds to your IOS file Copyright 2011 Kenneth M. Chipps Ph.D.

70 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Load the Cisco IOS Now click the drop-down arrow next to Model and choose the model corresponding to your IOS file For now, we’ll accept the default values that remain However, there is a very important value called the IDLE PC value that we will want to include We’ll get to that later Copyright 2011 Kenneth M. Chipps Ph.D.

71 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Load the Cisco IOS Click the Save button and then the Close button This will return you to the default GNS3 window Copyright 2011 Kenneth M. Chipps Ph.D.

72 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Load the Cisco IOS Copyright 2011 Kenneth M. Chipps Ph.D.

73 Set the Path to Dynamips
Next tell GNS3 where Dynamips is located Select Edit Preferences Dynamips Copyright 2011 Kenneth M. Chipps Ph.D.

74 Select the Path to Dynamips
Copyright 2011 Kenneth M. Chipps Ph.D.

75 Select the Path to Dynamips
Copyright 2011 Kenneth M. Chipps Ph.D.

76 Select the Path to Dynamips
Click on the … box beside Executable path: Be sure it points to the Dynamips file In this example it is in the GNS3 directory on the C: drive Click Test Ok Copyright 2011 Kenneth M. Chipps Ph.D.

77 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Load a Client A client such as telnet, ssh, or any of the others out there you like needs to be setup In many cases this is quite a task in GNS3 Why I do not know In my case I tried with no result Telnet Putty Several versions of Teraterm Copyright 2011 Kenneth M. Chipps Ph.D.

78 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Load a Client The first one I got to work on the Windows 7 Ultimate 64 bit computer was Teraterm 2.3 ssh Specifically Ttermpro23ttssh.exe The setting in GNS3 used for it is Copyright 2011 Kenneth M. Chipps Ph.D.

79 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Load a Client Copyright 2011 Kenneth M. Chipps Ph.D.

80 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Load a Client I also found that the Windows 7 telnet client would work if it was run from the command line, not from GNS3 For example telnet or whatever the port number is Copyright 2011 Kenneth M. Chipps Ph.D.

81 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Load a Client Why this is so, I have no clue The obvious one to try is the telnet client included with the OS you are using Keep in mind that Microsoft Windows versions from Vista on do not load a telnet client by default To do this in these versions Copyright 2011 Kenneth M. Chipps Ph.D.

82 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Load a Client Click Start, and then click Control Panel On the Control Panel Home page, click Programs In the Programs and Features section, click Turn Windows features on or off If the User Account Control dialog box appears, confirm that the action it displays is what you want, and then click Continue In the Windows Features list, select Telnet Client, and then click Ok Copyright 2011 Kenneth M. Chipps Ph.D.

83 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Practice Lab 1 Back to how to use GNS3 As the GNS3 web site says the first thing to do is to create a simple topology with one router to see how GNS3 works So Copyright 2011 Kenneth M. Chipps Ph.D.

84 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Practice Lab 1 Step 4 Create a Basic Topology First to see how GNS3 works we will create a simple topology The GNS3 window is divided into four panes by default The left-most pane lists the types of nodes available You will see router icons for the various platforms, a PIX firewall, Ethernet switch, ATM bridge, ATM switch, Frame Relay switch, and Cloud Other node types may be added as explained later Copyright 2011 Kenneth M. Chipps Ph.D.

85 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Practice Lab 1 The right-most pane will provide a topology summary that will be better understood when we built more complex topologies For now, just know that the pane exists The middle section contains two panes The top pane is your work area where a topology may be graphically built The bottom pane, called the Console, shows Dynagen at work Click on a router icon under Nodes Types corresponding to the IOS platform you are using In our example, we are using a 7200 platform Copyright 2011 Kenneth M. Chipps Ph.D.

86 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Practice Lab 1 Drag an appropriate router node type over to the workplace pane in the middle and let go We now have a router ready to configure Right-click the router and choose Configure Click the Slots tab to see what is already there if anything If there are none, select some Click Ok Copyright 2011 Kenneth M. Chipps Ph.D.

87 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Practice Lab 1 Copyright 2011 Kenneth M. Chipps Ph.D.

88 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Practice Lab 1 Copyright 2011 Kenneth M. Chipps Ph.D.

89 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Practice Lab 1 Copyright 2011 Kenneth M. Chipps Ph.D.

90 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Practice Lab 1 Copyright 2011 Kenneth M. Chipps Ph.D.

91 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Practice Lab 1 Start the router by right clicking on the router and selecting Start Copyright 2011 Kenneth M. Chipps Ph.D.

92 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Practice Lab 1 Copyright 2011 Kenneth M. Chipps Ph.D.

93 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Practice Lab 1 Copyright 2011 Kenneth M. Chipps Ph.D.

94 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Practice Lab 1 Now access the command line of the IOS by right clicking on the router and selecting Console Copyright 2011 Kenneth M. Chipps Ph.D.

95 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Practice Lab 1 Copyright 2011 Kenneth M. Chipps Ph.D.

96 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Practice Lab 1 Look around as you would do on any Cisco router Copyright 2011 Kenneth M. Chipps Ph.D.

97 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Adjust the Balance Another digression When the first lab is done a setting needs to be adjusted so that Dynamips does not use up all of the resources of the computer it is running on This should be done with just one router in place Copyright 2011 Kenneth M. Chipps Ph.D.

98 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Adjust the Balance To do this Right-click the router and choose Idle PC GNS3 will spend a moment calculating an Idle PC value before presenting the screen to the right If you click the drop-down arrow, you see a list of possible idlepc values Potentially better idlepc values are marked with an asterisk Choose one of the values with an asterisk and click OK Copyright 2011 Kenneth M. Chipps Ph.D.

99 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Adjust the Balance You’ll receive a confirmation that the idlepc value has been applied Copyright 2011 Kenneth M. Chipps Ph.D.

100 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Adjust the Balance Copyright 2011 Kenneth M. Chipps Ph.D.

101 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Adjust the Balance Copyright 2011 Kenneth M. Chipps Ph.D.

102 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Adjust the Balance If you choose IOS images and hypervisors on the Edit menu, and doubleclick on the image under the IOS Images tab, you’ll see the new idlepc value displayed under Settings You may repeat this process to find the value that reduces CPU usage the most Copyright 2011 Kenneth M. Chipps Ph.D.

103 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Adjust the Balance To observe CPU usage in Windows, press Ctrl+ALT+DEL and choose Task Manager Click on the Performance tab to view CPU usage You will observe that without an idlepc value, CPU usage will be at or near 100%, but with an idlepc value, CPU usage will drop to a very low value Copyright 2011 Kenneth M. Chipps Ph.D.

104 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Practice Lab 1 You may now return to your client window to use your router You are actually running the Cisco IOS that you found All commands supported by the IOS are available Remember earlier we chose a FastEthernet adapter and a four-port serial adapter Copyright 2011 Kenneth M. Chipps Ph.D.

105 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Practice Lab 1 If you issue the show ip interface brief command, you’ll see the designations for these ports on the router Exit GNS3 Copyright 2011 Kenneth M. Chipps Ph.D.

106 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Practice Lab 2 Although a single router is useful to get familiar with commands, it would be nice to build more complex topologies With GNS3 very complex topologies may be built Let’s build a topology with three routers Copyright 2011 Kenneth M. Chipps Ph.D.

107 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Name the Project The next time GNS3 is started it will ask for a project name Start GNS3 You can name a project if you wish or click Cancel Copyright 2011 Kenneth M. Chipps Ph.D.

108 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Name the Project Copyright 2011 Kenneth M. Chipps Ph.D.

109 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Practice Lab 2 Drag three routers running an IOS you have configured into the workspace Right-click each router and choose Configure under the Slots tab, include a FastEthernet adapter and PA-4T serial adapter Now we’re ready to connect the routers together Copyright 2011 Kenneth M. Chipps Ph.D.

110 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Practice Lab 2 Click the Add a link button on the toolbar at the top Copyright 2011 Kenneth M. Chipps Ph.D.

111 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Practice Lab 2 Copyright 2011 Kenneth M. Chipps Ph.D.

112 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Practice Lab 2 Choose Manual from the drop-down menu Your cursor will change to a cross Click on R1 and select s1/0 – then click on R1 and select s1/0 Click on R2 again and select s1/1 – then click on R3 and select s1/1 Copyright 2011 Kenneth M. Chipps Ph.D.

113 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Practice Lab 2 Now click the Add a link button again, it looks like a red stop sign with an X After clicking on it, the icon will change back to a connector look Notice the right-pane call Topology Summary Your connections are now available for viewing by clicking beside each router Copyright 2011 Kenneth M. Chipps Ph.D.

114 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
Practice Lab 2 Configure the routers Then test the connectivity Copyright 2011 Kenneth M. Chipps Ph.D.

115 Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
GNS3 As we have seen GNS3 can be a little tricky to use, but it is worth the trouble Copyright 2011 Kenneth M. Chipps Ph.D.


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