1 00:00:08,436 --> 00:00:11,304 - In the previous video, we started the download process 2 00:00:11,304 --> 00:00:14,411 of GNS3, we started the opening of the application 3 00:00:14,411 --> 00:00:16,903 for the very first time, and we went through the initial 4 00:00:16,903 --> 00:00:19,208 steps of the setup wizard, where all of the different 5 00:00:19,208 --> 00:00:23,301 applications, like GNS3, Dynamips, Wireshark, 6 00:00:23,301 --> 00:00:25,851 were all downloaded and installed into our laptop. 7 00:00:25,851 --> 00:00:27,639 So now we're gonna continue that process 8 00:00:27,639 --> 00:00:29,516 and see what the next steps are, 'cause we're not 9 00:00:29,516 --> 00:00:32,479 quite ready yet to create our virtual topologies. 10 00:00:32,479 --> 00:00:36,646 So, next thing is, we're gonna hit the Finish button, 11 00:00:37,582 --> 00:00:40,492 and what you're not seeing is that there's a screen 12 00:00:40,492 --> 00:00:43,403 on my laptop, basically just a web browser that will come up 13 00:00:43,403 --> 00:00:46,654 from GNS3 saying "Thank you for downloading our software!" 14 00:00:46,654 --> 00:00:49,315 And then, this box will come up. 15 00:00:49,315 --> 00:00:52,041 So now at this point, we have a choice to make. 16 00:00:52,041 --> 00:00:55,075 So we can either run GNS3 on the local server 17 00:00:55,075 --> 00:00:57,075 or within a virtual machine, so let me just talk 18 00:00:57,075 --> 00:00:58,958 about that real briefly here. 19 00:00:58,958 --> 00:01:03,538 First of all, if your primary reason for using GNS3 is that 20 00:01:03,538 --> 00:01:06,549 you just wanna create Cisco topologies, you wanna practice 21 00:01:06,549 --> 00:01:10,287 Cisco IOS command line, routers and you wanna 22 00:01:10,287 --> 00:01:12,972 connect them together, then really all you have to do 23 00:01:12,972 --> 00:01:15,274 is select the Local Server option, 24 00:01:15,274 --> 00:01:19,309 which is not selected by default, right there. 25 00:01:19,309 --> 00:01:23,333 And what Local Server simply means is that GNS3 26 00:01:23,333 --> 00:01:26,489 will be running on your laptop just like a normal program, 27 00:01:26,489 --> 00:01:29,500 just like Microsoft Outlook or Google Chrome, 28 00:01:29,500 --> 00:01:31,509 or anything else you've got running. 29 00:01:31,509 --> 00:01:33,095 It'll just run directly on there. 30 00:01:33,095 --> 00:01:34,611 And quite frankly, if you're just doing 31 00:01:34,611 --> 00:01:36,680 basic Cisco topologies, that's probably 32 00:01:36,680 --> 00:01:38,635 the preferred way to go. 33 00:01:38,635 --> 00:01:41,531 Now if you're a more advanced user, then you probably 34 00:01:41,531 --> 00:01:45,198 wanna select the local GNS3 virtual machine. 35 00:01:46,477 --> 00:01:49,322 Now, this will also require that you've already downloaded 36 00:01:49,322 --> 00:01:53,489 and installed either VirtualBox or some flavor of VMware, 37 00:01:55,155 --> 00:01:58,775 because the virtual machine will use VirtualBox or VMware 38 00:01:58,775 --> 00:02:02,651 as sort of like the engine that's running everything. 39 00:02:02,651 --> 00:02:04,291 Now, like I said, if you're just running 40 00:02:04,291 --> 00:02:07,322 simple Cisco topologies with routers and switches, 41 00:02:07,322 --> 00:02:09,130 you don't really need to go the extra distance 42 00:02:09,130 --> 00:02:10,726 of doing the virtual machine, there's a lot 43 00:02:10,726 --> 00:02:13,027 of extra steps involved with that. 44 00:02:13,027 --> 00:02:15,725 But, if you're more an intermediate or advanced user, 45 00:02:15,725 --> 00:02:17,446 and you wanna start doing things like, 46 00:02:17,446 --> 00:02:21,288 okay, I want to pair up my virtual topology 47 00:02:21,288 --> 00:02:24,946 with a Cisco ASA, some kind of a firewall, 48 00:02:24,946 --> 00:02:27,779 or maybe I wanna use IOU or L2IOU, 49 00:02:29,362 --> 00:02:32,292 and I wanna pair that up with my virtual topology. 50 00:02:32,292 --> 00:02:34,726 In those particular cases, now we have to start 51 00:02:34,726 --> 00:02:36,923 getting virtual machines involved. 52 00:02:36,923 --> 00:02:38,578 But that's more complex stuff, and we're not 53 00:02:38,578 --> 00:02:41,672 gonna cover that in this particular series of videos. 54 00:02:41,672 --> 00:02:44,386 So to keep things simple, I'm just gonna install it 55 00:02:44,386 --> 00:02:47,098 as a local server, directly on my laptop, 56 00:02:47,098 --> 00:02:50,285 no virtual machines necessary. 57 00:02:50,285 --> 00:02:53,544 And now we get to the point where we get to choose 58 00:02:53,544 --> 00:02:57,127 what IOS image we want to import into GNS3. 59 00:02:58,724 --> 00:03:02,504 So we select Finish, and now we have a box that comes up 60 00:03:02,504 --> 00:03:05,727 that says, it's probably gonna look like this for you, 61 00:03:05,727 --> 00:03:07,525 if you've done this the very first time. 62 00:03:07,525 --> 00:03:10,015 And here's where you get to browse for wherever you've 63 00:03:10,015 --> 00:03:12,247 downloaded your Cisco IOS software to. 64 00:03:12,247 --> 00:03:16,152 So I'm gonna browse, and my particular case, 65 00:03:16,152 --> 00:03:19,658 I've got my IOS images located in an external hard drive 66 00:03:19,658 --> 00:03:23,467 called Cisco IOS, and there they are. 67 00:03:23,467 --> 00:03:25,071 Now let me show you something that's kind of interesting. 68 00:03:25,071 --> 00:03:29,900 In previous videos, I talked about that GNS3 only supports 69 00:03:29,900 --> 00:03:33,552 certain software images, it doesn't support every single 70 00:03:33,552 --> 00:03:35,711 router out there that Cisco does. 71 00:03:35,711 --> 00:03:39,359 Now, what if you had ignored that, and you downloaded 72 00:03:39,359 --> 00:03:42,528 a Cisco IOS software image that GNS3 didn't support? 73 00:03:42,528 --> 00:03:43,676 What would happen? 74 00:03:43,676 --> 00:03:45,789 Well, let's take a look at that. 75 00:03:45,789 --> 00:03:50,254 I already know in advance that the 3845, at present, 76 00:03:50,254 --> 00:03:53,441 is not supported by GNS3, so I'm gonna go ahead 77 00:03:53,441 --> 00:03:55,126 and select that intentionally. 78 00:03:55,126 --> 00:03:57,443 I'm gonna click Open. 79 00:03:57,443 --> 00:03:59,908 Okay, and then it says, all right, so basically it wants to 80 00:03:59,908 --> 00:04:02,444 move that IOS into a working directory 81 00:04:02,444 --> 00:04:06,488 that GNS3 can access more quickly, so I'll say yes. 82 00:04:06,488 --> 00:04:09,087 No error messages yet. 83 00:04:09,087 --> 00:04:12,462 Click Next, and then I get the error message, 84 00:04:12,462 --> 00:04:14,998 where it says the IOS image for that particular platform 85 00:04:14,998 --> 00:04:17,174 is not supported by this application. 86 00:04:17,174 --> 00:04:20,769 So, even if you didn't do your research ahead of time, 87 00:04:20,769 --> 00:04:22,016 you'll get that error message. 88 00:04:22,016 --> 00:04:24,629 Now hopefully, you didn't spend a lot of time and money 89 00:04:24,629 --> 00:04:26,258 downloading an IOS software image 90 00:04:26,258 --> 00:04:29,425 that ultimately you can't use in GNS3. 91 00:04:30,292 --> 00:04:34,459 Now in my particular case, I'm gonna use a 3745 image, 92 00:04:35,712 --> 00:04:38,608 which I've already downloaded and got here. 93 00:04:38,608 --> 00:04:40,086 Now before I leave the screen notice there's 94 00:04:40,086 --> 00:04:44,807 a little box here that says "This is an EtherSwitch router." 95 00:04:44,807 --> 00:04:48,270 Once we get into the world of switching with GNS3, 96 00:04:48,270 --> 00:04:51,257 we'll see that we've got two sort of high-level choices. 97 00:04:51,257 --> 00:04:54,201 Actually, we have three choices, but for the basic world 98 00:04:54,201 --> 00:04:55,999 of switching, there's two choices. 99 00:04:55,999 --> 00:04:58,611 The two choices are, GNS3 comes with sort of like 100 00:04:58,611 --> 00:05:01,194 a built-in, very simple switch. 101 00:05:02,185 --> 00:05:04,258 Like I talked about in the previous video, I talked about 102 00:05:04,258 --> 00:05:07,328 the virtual PC simulator that comes built-in. 103 00:05:07,328 --> 00:05:10,156 Well, that's not a full-fledged PC, that's not running 104 00:05:10,156 --> 00:05:13,067 Windows or anything like that, it's basically a real 105 00:05:13,067 --> 00:05:15,019 stripped-down PC that just allows you to do like 106 00:05:15,019 --> 00:05:19,393 TCP and UDP streams, and some ICMP, and stuff like that. 107 00:05:19,393 --> 00:05:23,164 Well similarly, there's something called a built-in node, 108 00:05:23,164 --> 00:05:26,219 which is a switch node, and if you select that, 109 00:05:26,219 --> 00:05:28,476 you can select VLANs on there, you can select 110 00:05:28,476 --> 00:05:31,525 802.1Q trunking, and that's about it. 111 00:05:31,525 --> 00:05:34,923 So there's no command line, it's all GUI-driven 112 00:05:34,923 --> 00:05:37,190 with little dropdown boxes and stuff. 113 00:05:37,190 --> 00:05:39,096 So for simple switching, if you just wanna connect 114 00:05:39,096 --> 00:05:41,175 some routers with a switch, and you don't really care 115 00:05:41,175 --> 00:05:43,627 about actually configuring switches, 116 00:05:43,627 --> 00:05:45,525 that's your easiest option. 117 00:05:45,525 --> 00:05:47,924 Now, if you wanna get a little bit more experience, 118 00:05:47,924 --> 00:05:51,121 which you probably will, actually configuring 119 00:05:51,121 --> 00:05:54,097 the command line for switching commands, like configuring 120 00:05:54,097 --> 00:05:57,856 a VLAN in the command line, configuring VTP, 121 00:05:57,856 --> 00:06:01,167 modifying some of your spanning-tree parameters. 122 00:06:01,167 --> 00:06:03,457 Well, then your next choice is to use something 123 00:06:03,457 --> 00:06:05,464 called and EtherSwitch module. 124 00:06:05,464 --> 00:06:08,188 I'll talk more about that in detail, but of all 125 00:06:08,188 --> 00:06:12,198 the Cisco routers that GNS3 supports, some of them, 126 00:06:12,198 --> 00:06:14,954 like the 3745 that I'm gonna select here, 127 00:06:14,954 --> 00:06:19,044 support that particular module, and it's actually a module 128 00:06:19,044 --> 00:06:21,107 that in a real router you would slip in, it actually has 129 00:06:21,107 --> 00:06:24,787 16 ports on it, and it's like a little mini switch 130 00:06:24,787 --> 00:06:28,405 that you sort of slide into an empty slot in your router. 131 00:06:28,405 --> 00:06:31,621 So, in this particular case, if that's what I wanted, 132 00:06:31,621 --> 00:06:35,109 I would actually click that box. 133 00:06:35,109 --> 00:06:37,960 So, what I'm gonna do, I'm actually gonna do this twice. 134 00:06:37,960 --> 00:06:39,903 The first time, I'm just gonna import this 135 00:06:39,903 --> 00:06:43,758 as a normal router, without that module. 136 00:06:43,758 --> 00:06:45,175 So I'll hit Next. 137 00:06:46,234 --> 00:06:49,534 Actually, you know what, let's make it simple for ourselves, 138 00:06:49,534 --> 00:06:52,852 because even the EtherSwitch router, even though it's got 139 00:06:52,852 --> 00:06:56,114 that module in it that's the EtherSwitch, 140 00:06:56,114 --> 00:06:58,820 it also has other module slots available for like, 141 00:06:58,820 --> 00:07:01,495 FastEthernet cards, or routable interfaces, 142 00:07:01,495 --> 00:07:04,515 serial interfaces, so to make things simple, 143 00:07:04,515 --> 00:07:07,904 let's just have, well, just to show you I'll have a router 144 00:07:07,904 --> 00:07:09,859 and an EtherSwitch to show you the variety. 145 00:07:09,859 --> 00:07:12,855 But what I was going to say was, you could just have 146 00:07:12,855 --> 00:07:16,832 every router in your topology as an EtherSwitch, 147 00:07:16,832 --> 00:07:19,351 and you could use the switching module in some of them, 148 00:07:19,351 --> 00:07:20,942 and you could not use the switching module 149 00:07:20,942 --> 00:07:22,740 in others of them, but all of them could have 150 00:07:22,740 --> 00:07:25,272 serial interfaces and stuff like that, but to show you 151 00:07:25,272 --> 00:07:28,660 the difference, I'll just keep on going here. 152 00:07:28,660 --> 00:07:32,526 Now, what's kind of interesting here is, in the process 153 00:07:32,526 --> 00:07:35,441 of creating these videos, I've installed and uninstalled 154 00:07:35,441 --> 00:07:38,602 GNS3 multiple times, and even though I've done that, 155 00:07:38,602 --> 00:07:41,513 it's remembering some of the stuff I've done previously. 156 00:07:41,513 --> 00:07:44,353 If you're doing this for the very first time, chances are 157 00:07:44,353 --> 00:07:47,535 it's not gonna default to 256 megabytes of RAM. 158 00:07:47,535 --> 00:07:51,702 I think it actually defaults to 128 megabytes of RAM. 159 00:07:52,567 --> 00:07:55,422 So you're gonna wanna verify, like I said in some of the 160 00:07:55,422 --> 00:07:58,724 previous videos, what the RAM requirements are 161 00:07:58,724 --> 00:08:01,303 for your software image. 162 00:08:01,303 --> 00:08:03,680 Now in my particular case, with this 30-- 163 00:08:03,680 --> 00:08:08,670 Actually, 3845. Nope, that's wrong, I don't want a 3845. 164 00:08:08,670 --> 00:08:10,670 That is the wrong image. 165 00:08:12,233 --> 00:08:14,444 So let's go ahead and use the existing image. 166 00:08:14,444 --> 00:08:16,654 It remembered this, even though I've installed 167 00:08:16,654 --> 00:08:19,347 and uninstalled everything. 168 00:08:19,347 --> 00:08:22,831 3725, there we go. There we go, 128 megs of RAM. 169 00:08:22,831 --> 00:08:25,528 That is wrong, I need to double that 170 00:08:25,528 --> 00:08:27,528 to 256 megabytes of RAM. 171 00:08:29,651 --> 00:08:31,341 Then click Next. 172 00:08:31,341 --> 00:08:34,483 And now here's where I get to select what modules 173 00:08:34,483 --> 00:08:38,408 or port adapters I want in my chassis. 174 00:08:38,408 --> 00:08:40,482 And so, the nice thing about this is, y'know, 175 00:08:40,482 --> 00:08:43,681 a question I had when I was first learning about GNS3 was, 176 00:08:43,681 --> 00:08:47,291 I wondered "Well, if I fully load this thing, if I populate 177 00:08:47,291 --> 00:08:51,062 "every slot with something, is that gonna hurt things? 178 00:08:51,062 --> 00:08:53,301 "Is that gonna slow it down in some way?" 179 00:08:53,301 --> 00:08:54,881 And actually, it doesn't. 180 00:08:54,881 --> 00:08:57,246 I was actually told by the GNS3 developers itself 181 00:08:57,246 --> 00:09:00,141 that you can do that, there's no harm in doing that. 182 00:09:00,141 --> 00:09:02,956 So, go right ahead. So, I'm gonna go ahead and do that, 183 00:09:02,956 --> 00:09:05,739 and it comes with a FastEthernet slot already on it. 184 00:09:05,739 --> 00:09:06,829 Now this is just because of this 185 00:09:06,829 --> 00:09:09,454 particular router that I've selected. 186 00:09:09,454 --> 00:09:12,111 And another slot, I'm gonna put another FastEthernet card, 187 00:09:12,111 --> 00:09:14,411 and then I'll put another FastEthernet card. 188 00:09:14,411 --> 00:09:18,085 As I go forward, I've got some WIC slots available. 189 00:09:18,085 --> 00:09:21,404 Once again, there are slots available on the 3725. 190 00:09:21,404 --> 00:09:24,217 Depending on the software that you are using, 191 00:09:24,217 --> 00:09:26,746 you might not have all of these available to you. 192 00:09:26,746 --> 00:09:29,582 Or you might have more, just depending on what software. 193 00:09:29,582 --> 00:09:32,481 So I'm gonna put some serial interfaces 194 00:09:32,481 --> 00:09:34,706 in these slots right here, so I'm gonna have tons 195 00:09:34,706 --> 00:09:37,456 of interfaces in every single one of my router, 196 00:09:37,456 --> 00:09:39,527 to give me lots of flexibility in the types 197 00:09:39,527 --> 00:09:42,677 of topologies that I design. 198 00:09:42,677 --> 00:09:43,594 Click Next. 199 00:09:45,657 --> 00:09:47,993 All right, so it's thinkin' about it a little bit. 200 00:09:47,993 --> 00:09:51,910 Oops, I wanted to go back there, so let's edit. 201 00:09:57,853 --> 00:10:02,020 Okay, well, the thing that it skipped past was the idle PC. 202 00:10:03,333 --> 00:10:06,189 So, I want to show that to you. 203 00:10:06,189 --> 00:10:08,386 So I'm gonna go ahead and remove this, 204 00:10:08,386 --> 00:10:09,938 and here's a good way of doing it, so once it's in there 205 00:10:09,938 --> 00:10:12,539 you just click Delete to get rid of it. 206 00:10:12,539 --> 00:10:15,933 And to add a new router, or an additional router, 207 00:10:15,933 --> 00:10:17,454 you just click New. 208 00:10:17,454 --> 00:10:19,419 So let's just go through the process here, 209 00:10:19,419 --> 00:10:21,412 everything's gonna be the same. 210 00:10:21,412 --> 00:10:22,912 Upgrade my memory. 211 00:10:26,745 --> 00:10:30,912 And this is, hold on a second, let's put my cards in here. 212 00:10:40,051 --> 00:10:41,968 All right. The idle PC. 213 00:10:43,003 --> 00:10:46,218 This definitely bears a little bit of discussion. 214 00:10:46,218 --> 00:10:48,658 I'm not gonna go into the gory details of how this works 215 00:10:48,658 --> 00:10:50,881 at the low-level mechanics of everything, 216 00:10:50,881 --> 00:10:53,174 but here's what I'll say about this. 217 00:10:53,174 --> 00:10:55,755 Cisco IOS is massively large. 218 00:10:55,755 --> 00:10:58,408 If you were actually to take a look at all the lines of code 219 00:10:58,408 --> 00:11:00,712 in a particular IOS software image, 220 00:11:00,712 --> 00:11:03,117 there would be thousands of lines of code. 221 00:11:03,117 --> 00:11:06,405 And what some of those lines of code do is they instruct 222 00:11:06,405 --> 00:11:10,313 the CPU to go into an idle state, because it's waiting 223 00:11:10,313 --> 00:11:12,991 for some sort of event or trigger to happen, 224 00:11:12,991 --> 00:11:16,750 like an incoming data packet, or an incoming BGP update, 225 00:11:16,750 --> 00:11:19,720 or a TCP keepalive or something like that. 226 00:11:19,720 --> 00:11:21,470 Well, that's all well and good if that IOS 227 00:11:21,470 --> 00:11:24,753 is working on a real, physical Cisco chassis. 228 00:11:24,753 --> 00:11:27,771 The problem is, it's not. In this particular case, 229 00:11:27,771 --> 00:11:30,936 it's working on an emulated router provided by Dynamips 230 00:11:30,936 --> 00:11:33,481 and the whole virtualization behind this. 231 00:11:33,481 --> 00:11:35,610 And so when it goes into that idle state, 232 00:11:35,610 --> 00:11:38,123 it ends up staying in that idle state and sort of 233 00:11:38,123 --> 00:11:41,386 going into this like infinite loop, which can actually cause 234 00:11:41,386 --> 00:11:46,079 your CPU on your laptop to skyrocket, and go to like 100%. 235 00:11:46,079 --> 00:11:47,854 We don't want that. 236 00:11:47,854 --> 00:11:50,431 So what this does is, by clicking this button, 237 00:11:50,431 --> 00:11:53,173 it's gonna sort of go through the code in the background 238 00:11:53,173 --> 00:11:55,766 and look for those particular points in the code 239 00:11:55,766 --> 00:11:57,626 where that would normally happen, where it would 240 00:11:57,626 --> 00:12:00,514 go into this idle state, and instead of telling the CPU 241 00:12:00,514 --> 00:12:03,684 to go into this idle, infinite loop, instead it's simply 242 00:12:03,684 --> 00:12:07,245 going to instruct that virtual router to go to sleep. 243 00:12:07,245 --> 00:12:09,534 It tells it to go to sleep for a few microseconds 244 00:12:09,534 --> 00:12:12,645 or a few milliseconds, and then it wakes up again 245 00:12:12,645 --> 00:12:15,499 and continues on to the next task it was going to do. 246 00:12:15,499 --> 00:12:17,244 So it prevents your CPU from going 247 00:12:17,244 --> 00:12:19,601 to that skyrocketing 100%. 248 00:12:19,601 --> 00:12:22,833 So we're gonna click on the Idle PC Finder. 249 00:12:22,833 --> 00:12:26,583 And so you'll get a box that looks like this. 250 00:12:27,870 --> 00:12:29,944 Computing idle PC values, and we just 251 00:12:29,944 --> 00:12:32,418 have to wait patiently, it doesn't take very long. 252 00:12:32,418 --> 00:12:35,640 It's typically less than a minute, and then it will 253 00:12:35,640 --> 00:12:38,344 come up with some value by itself. 254 00:12:38,344 --> 00:12:42,792 Now, there are ways to manually determine an idle PC value 255 00:12:42,792 --> 00:12:45,997 for the particular software that you are using, 256 00:12:45,997 --> 00:12:47,773 but you shouldn't have to do that. 257 00:12:47,773 --> 00:12:49,737 This tool should work for you 258 00:12:49,737 --> 00:12:53,487 because the manual process is rather complex. 259 00:12:54,562 --> 00:12:57,261 There we go, and it found an idle PC value for us. 260 00:12:57,261 --> 00:13:00,131 And remember, this number is unique to 261 00:13:00,131 --> 00:13:03,002 this particular software image. 262 00:13:03,002 --> 00:13:04,976 Even if I had another software image 263 00:13:04,976 --> 00:13:07,507 for this exact same router, but it was 264 00:13:07,507 --> 00:13:10,534 a different version, or a different feature set, 265 00:13:10,534 --> 00:13:13,545 it would compute a different idle PC value. 266 00:13:13,545 --> 00:13:15,176 So that's why you really don't want 267 00:13:15,176 --> 00:13:17,260 to do it manually if you can avoid it. 268 00:13:17,260 --> 00:13:19,836 So now we can hit Finish, 269 00:13:19,836 --> 00:13:22,178 and now that router is available to us. 270 00:13:22,178 --> 00:13:24,277 So now we can use that in our virtual topology. 271 00:13:24,277 --> 00:13:25,959 Now what I'm gonna do is add one more, 272 00:13:25,959 --> 00:13:27,809 because I also want to basically 273 00:13:27,809 --> 00:13:31,388 turn this router into a switch... 274 00:13:31,388 --> 00:13:34,138 By selecting the EtherSwitch box. 275 00:13:35,313 --> 00:13:39,480 And now when I do that, let's go ahead and change the RAM. 276 00:13:41,212 --> 00:13:43,286 Now you can see it automatically populates 277 00:13:43,286 --> 00:13:47,896 one of those slots with this 16-port EtherSwitch module. 278 00:13:47,896 --> 00:13:50,096 And if you want to you can just leave it that way. 279 00:13:50,096 --> 00:13:52,399 If the only thing you plan on using this router for 280 00:13:52,399 --> 00:13:55,982 is a 16-port Ethernet switch, you can leave it that way. 281 00:13:55,982 --> 00:13:58,590 Or, if you want to give yourself more flexibility, 282 00:13:58,590 --> 00:14:00,613 which is what I like to do, let's just go ahead 283 00:14:00,613 --> 00:14:03,546 and populate those other slots with some other stuff, 284 00:14:03,546 --> 00:14:06,432 so we've got full flexibility, a lot of choices here 285 00:14:06,432 --> 00:14:08,515 in how we use this thing. 286 00:14:11,181 --> 00:14:14,467 Once again, we're gonna select an idle PC. 287 00:14:14,467 --> 00:14:16,726 Now what's happening here, I can't show it to you 288 00:14:16,726 --> 00:14:19,117 because it's actually happening on a different monitor, 289 00:14:19,117 --> 00:14:22,802 but that same box that said "Please wait, computing a value" 290 00:14:22,802 --> 00:14:25,405 it's actually flashing right now, flashing on and off 291 00:14:25,405 --> 00:14:27,629 and on and off, and the first time I saw that it kinda 292 00:14:27,629 --> 00:14:29,984 freaked me out, thinking "Oh my gosh, it's gonna crash 293 00:14:29,984 --> 00:14:33,391 "or something," but actually, if you just sit back and wait, 294 00:14:33,391 --> 00:14:36,542 let it keep flashing at you, eventually it will compute 295 00:14:36,542 --> 00:14:39,022 an idle PC value that's suitable. 296 00:14:39,022 --> 00:14:43,638 So within a few seconds here, I should get one. 297 00:14:43,638 --> 00:14:46,055 There we go, it did find one. 298 00:14:47,233 --> 00:14:51,947 Finish, and now I have some routers available to me. 299 00:14:51,947 --> 00:14:53,975 So at this point, my setup process is done, 300 00:14:53,975 --> 00:14:57,687 so now I'm just gonna click Ok, and now it's gonna say 301 00:14:57,687 --> 00:14:59,160 "Okay, what do you want the name 302 00:14:59,160 --> 00:15:00,726 "of your first project to be?" 303 00:15:00,726 --> 00:15:03,354 You probably don't wanna leave it as Untitled, 304 00:15:03,354 --> 00:15:05,946 so give it some name, you can name it whatever you want. 305 00:15:05,946 --> 00:15:09,758 It could be Test, or you could say OSPF Project. 306 00:15:09,758 --> 00:15:12,258 I'm just gonna say CCNAEHRP-1, 307 00:15:14,971 --> 00:15:19,608 that's just what I'm gonna call mine, and hit Ok. 308 00:15:19,608 --> 00:15:22,775 And now this is your main GNS3 window. 309 00:15:23,621 --> 00:15:26,483 So, in the next set of videos I'm gonna start talking about 310 00:15:26,483 --> 00:15:29,366 how do we use this window and what are the various icons, 311 00:15:29,366 --> 00:15:32,305 and what are the various menus that are on here. 312 00:15:32,305 --> 00:15:34,673 But for now, we're done with the setup process, 313 00:15:34,673 --> 00:15:37,114 we're done with importing our software images. 314 00:15:37,114 --> 00:15:39,730 Also, one thing I'll show you is that you can go back 315 00:15:39,730 --> 00:15:41,839 to those routers at any point in time. 316 00:15:41,839 --> 00:15:45,933 You can just hit Edit > Preferences, and you're right back 317 00:15:45,933 --> 00:15:48,391 here to this screen, so just go ahead under Dynamips, 318 00:15:48,391 --> 00:15:52,165 click on IOS routers, there's your routers again, 319 00:15:52,165 --> 00:15:55,651 and you can go into Edit, and you can change 320 00:15:55,651 --> 00:15:58,042 a lot of the things about these routers. 321 00:15:58,042 --> 00:15:59,770 For example, the slots, I could go back now 322 00:15:59,770 --> 00:16:02,030 and change them to use different modules. 323 00:16:02,030 --> 00:16:05,350 Now, you don't wanna do this while the router is active. 324 00:16:05,350 --> 00:16:07,485 What we're gonna see here in the subsequent videos, 325 00:16:07,485 --> 00:16:09,891 it's gonna be a process of dragging a router 326 00:16:09,891 --> 00:16:12,220 into the main screen, but once you do that, 327 00:16:12,220 --> 00:16:15,283 it's like the router has shut down, it's not active. 328 00:16:15,283 --> 00:16:18,176 And then we're gonna click a button to start up the router, 329 00:16:18,176 --> 00:16:20,177 which is sorta like powering it on. 330 00:16:20,177 --> 00:16:23,235 Once a router is powered on, you don't wanna go in here 331 00:16:23,235 --> 00:16:26,211 and try to change the modules, I haven't tried doing that, 332 00:16:26,211 --> 00:16:28,053 but it would probably be a bad thing, 333 00:16:28,053 --> 00:16:30,183 your laptop would probably blow up in your face. 334 00:16:30,183 --> 00:16:32,691 Well, maybe not that, but it certainly might 335 00:16:32,691 --> 00:16:36,195 crash the system or have other unintended effects. 336 00:16:36,195 --> 00:16:39,464 So if you're gonna change what's in your module slots, 337 00:16:39,464 --> 00:16:41,873 or change the amount of memory to allocate to your router 338 00:16:41,873 --> 00:16:43,730 or something like that, you wanna make sure 339 00:16:43,730 --> 00:16:45,451 that all your routers are shut down 340 00:16:45,451 --> 00:16:48,278 and they're not working to do that. 341 00:16:48,278 --> 00:16:49,519 So that completes this section 342 00:16:49,519 --> 00:16:51,457 of the video on the setup process. 343 00:16:51,457 --> 00:16:53,984 In the next set of videos we're gonna go into how to 344 00:16:53,984 --> 00:16:58,151 actually use this to build our virtual topologies.