1 00:00:00,850 --> 00:00:10,430 In this example I'm connected to the console of a router when I type enable and then show version we 2 00:00:10,430 --> 00:00:15,360 can see the version of Cisco Ioway running on the router. 3 00:00:15,380 --> 00:00:16,630 So here's the short version. 4 00:00:16,630 --> 00:00:22,680 C'mon Cisco IOS software that we're running is an 1841 version of software. 5 00:00:22,910 --> 00:00:30,270 It's advanced enterprise software version 15 dot 1 4 and 8 release software. 6 00:00:30,340 --> 00:00:38,180 See 2 What you'll notice is that a version of software is different to the software in Rome or read 7 00:00:38,180 --> 00:00:39,410 only memory. 8 00:00:39,410 --> 00:00:46,750 The system bootstrap a version here is Tove dot for the Shradha has been up for 5 hours and 40 minutes. 9 00:00:46,820 --> 00:00:50,990 This is the version of operating system that the Rodda booted. 10 00:00:50,990 --> 00:00:57,280 So the system image file is this file which is stored in Flash. 11 00:00:57,350 --> 00:01:05,850 And that was loaded into memory Spaceballs shows me more information and I'll be able to see as an example 12 00:01:05,850 --> 00:01:13,230 the amount of RAM in the router as well as the amount of ENVI ram before I look at that let's use the 13 00:01:13,230 --> 00:01:14,640 C'mon show flash. 14 00:01:14,790 --> 00:01:20,850 Notice this is the operating system that was loaded into RAM on the router. 15 00:01:20,850 --> 00:01:23,680 So show flesh is similar to your hard drive. 16 00:01:23,790 --> 00:01:28,000 We have the operating system as well as another file stored in Flash. 17 00:01:28,020 --> 00:01:30,540 This is the size of flesh in bytes. 18 00:01:30,720 --> 00:01:32,910 And this is how much has been used. 19 00:01:33,180 --> 00:01:34,170 Here's another router 20 00:01:37,700 --> 00:01:39,270 show flash here. 21 00:01:40,500 --> 00:01:46,530 Shows us that a different version of operating system is found in the flash of this Rodda and other 22 00:01:46,530 --> 00:01:49,990 files are also stored in the flash of the Rodda. 23 00:01:50,010 --> 00:01:52,730 So this is very similar to a hard drive way. 24 00:01:52,800 --> 00:01:59,160 Multiple files can be stored in flash as an example I could use a command show run pipe 25 00:02:02,730 --> 00:02:14,140 and then redirect the output to flash and let's create a file called Show run test dot see if G. 26 00:02:16,430 --> 00:02:22,270 Now when I use the C'mon show flash notice that file is available in Flash. 27 00:02:22,330 --> 00:02:28,050 I've just copied the running config from RAM onto the flash drive. 28 00:02:28,050 --> 00:02:38,070 On this router you can use the more command to view that file and what you'll notice is it shows us 29 00:02:38,070 --> 00:02:41,900 that this is the current config at a specific time. 30 00:02:42,060 --> 00:02:47,140 And that's because this is a copy of the running config on the router. 31 00:02:47,280 --> 00:02:53,610 So the running config of the rod is stored in RAM so the show running config or show run command for 32 00:02:53,610 --> 00:02:58,490 short shows us the size of the current configuration. 33 00:02:58,500 --> 00:03:05,340 In other words the live config that's used by the router the shows start startup config shows start 34 00:03:05,400 --> 00:03:11,210 config shows us the saved configuration stored in nv ram. 35 00:03:11,220 --> 00:03:18,540 Notice the difference show startup shows us output using so many bytes out of so many bytes whereas 36 00:03:18,630 --> 00:03:27,530 the show running config shows current config being so many bytes so just know the output when you use 37 00:03:27,530 --> 00:03:33,920 show run you're going to see current config when you use the command show startup config will show start 38 00:03:34,880 --> 00:03:40,980 you going to see so many parts out of so many pints. 39 00:03:41,050 --> 00:03:47,800 Now we could use the Kamani re startup config and I was told that we are going to raise the nv ram file 40 00:03:47,800 --> 00:03:48,880 system. 41 00:03:48,880 --> 00:03:49,950 Do we want to continue. 42 00:03:49,960 --> 00:03:54,790 I'm going to press enter to confirm that we want a raise the startup config. 43 00:03:54,910 --> 00:04:01,950 So now when we use the command show startup config we are told that there is no startup config present 44 00:04:02,620 --> 00:04:09,060 no startup configuration is stored in the RAM but the running config is still available on the router. 45 00:04:09,610 --> 00:04:17,830 To save the configuration we would use the command copy running config startup config and that copies 46 00:04:17,830 --> 00:04:21,480 the configuration from RAM to NV RAM. 47 00:04:21,520 --> 00:04:30,510 So now when the top of the command shows startup config we see that a config is stored in NV ram that 48 00:04:30,510 --> 00:04:31,910 config is not live. 49 00:04:31,920 --> 00:04:39,810 So as an example if I created a loopback interface on this router and gave it a not-P address of something 50 00:04:39,810 --> 00:04:40,770 like the following 51 00:04:43,960 --> 00:04:46,450 show IP interface brief 52 00:04:49,150 --> 00:04:54,380 shows me that that IP address is available now on the loopback interface on the router. 53 00:04:54,670 --> 00:04:57,430 In other words the change was immediate. 54 00:04:57,430 --> 00:04:58,390 Show run 55 00:05:01,820 --> 00:05:04,580 shows us that a loopback interface. 56 00:05:04,610 --> 00:05:09,250 In other words it happened immediately and was added to the running config. 57 00:05:10,540 --> 00:05:18,340 Show startup config however doesn't show us the loopback interface changes are only written to the startup 58 00:05:18,340 --> 00:05:25,510 config when you use the copy run startup config command or W-r for short. 59 00:05:25,510 --> 00:05:28,110 So now when we look at the startup config 60 00:05:31,240 --> 00:05:36,790 you'll notice that the loopback interface is configured as part of the startup config so the running 61 00:05:36,790 --> 00:05:40,950 config is stored in RAM startup config is stored in NV RAM. 62 00:05:41,080 --> 00:05:50,790 You can copy the startup config to NV RAM by using the command copy running config start up config. 63 00:05:50,830 --> 00:05:53,110 That would be an exam on sir. 64 00:05:53,410 --> 00:05:57,550 But for the real world you could simply use the command W-r. 65 00:05:57,550 --> 00:06:00,640 You can also store files in Flash. 66 00:06:01,060 --> 00:06:09,160 So as I demonstrated you could copy the running config on startup config to flash flash can store multiple 67 00:06:09,160 --> 00:06:17,800 files as seen on this router but the primary file that flash is used for is the storing of the operating 68 00:06:17,800 --> 00:06:22,260 system which is loaded into RAM when the router boots up. 69 00:06:22,370 --> 00:06:24,310 Flash is nonvolatile. 70 00:06:24,340 --> 00:06:30,610 In other words when the Rodda reboot the file is not lost but it will be removed from RAM when the Rodda 71 00:06:30,610 --> 00:06:37,490 boots up the operating system is copied from flash to RAM so that it can be used in real time. 72 00:06:37,540 --> 00:06:38,660 So let's look at the short version. 73 00:06:38,660 --> 00:06:45,240 C'mon Again this shows this information once again about the uptime of the router the operating system 74 00:06:45,240 --> 00:06:47,310 used how it was reloaded. 75 00:06:47,310 --> 00:06:51,310 So this was normal reload and scrolling down. 76 00:06:51,420 --> 00:06:55,200 We can see the amount of RAM available on the router. 77 00:06:55,460 --> 00:07:02,410 Now that's in kilobytes to get the total RAM on the Rodda you need to add those two together. 78 00:07:03,100 --> 00:07:09,580 So 2 3 9 6 1 6 plus 2 2 5 to 8. 79 00:07:09,880 --> 00:07:17,260 That gives us the amount of RAM on the Radi So we need to divide by 1024. 80 00:07:17,600 --> 00:07:26,300 And that shows us the amount of RAM on the Shradha it's got 256 mega ram this router however is using 81 00:07:26,300 --> 00:07:35,680 a different version of operating system as we've seen and has a different amount of RAM so 2 3 3 4 7 82 00:07:35,680 --> 00:07:45,410 2 plus 2 8 6 7 2 gives us that divide by 1024 83 00:07:48,340 --> 00:07:57,000 well so gives us 256 mega RAM so you need to add these values together to work out the amount of RAM 84 00:07:57,000 --> 00:07:57,960 in the router. 85 00:07:58,260 --> 00:08:06,720 You'll notice that the nv ram value is a lot smaller than RAM only 191 kilobytes of envied RAM is available 86 00:08:07,140 --> 00:08:10,980 whereas we've got 256 megabytes of RAM available. 87 00:08:11,010 --> 00:08:12,960 This is the size of the compact flash. 88 00:08:12,960 --> 00:08:16,420 On this router which is the same on this router. 89 00:08:16,890 --> 00:08:24,090 Notice this router has two fast Ethan interfaces and two serial interfaces whereas this router has two 90 00:08:24,240 --> 00:08:31,500 first Ethan interfaces one serial interface and one VPN module. 91 00:08:31,500 --> 00:08:36,110 The interfaces on a router can very show IP interface brief 92 00:08:39,180 --> 00:08:46,720 on the Shradha shows us the physical interfaces and once again show IP interface brief on this Shradha 93 00:08:46,710 --> 00:08:51,920 shows us the interfaces on it which are different to Rodda one.