1 00:00:05,270 --> 00:00:05,480 Okay. 2 00:00:05,480 --> 00:00:07,070 So this is just for us as humans. 3 00:00:07,070 --> 00:00:09,530 Show IP interface brief doesn't really help us. 4 00:00:09,560 --> 00:00:15,920 What I'm going to do now, however, is use the command json pretty. 5 00:00:16,190 --> 00:00:20,360 So this line in yellow is actually the only change in the script. 6 00:00:20,450 --> 00:00:25,010 But I've put the full script in this PowerPoint presentation so that you can download it. 7 00:00:25,280 --> 00:00:26,510 So let's use Nano. 8 00:00:26,510 --> 00:00:27,620 Nano once again. 9 00:00:28,580 --> 00:00:30,260 Nano is a simple text editor. 10 00:00:30,920 --> 00:00:33,290 Similar to Notepad on Windows, if you like. 11 00:00:33,690 --> 00:00:38,930 I want to say Nano Python two and what I'll do is paste my script in here. 12 00:00:39,350 --> 00:00:41,060 He had pasted it correctly. 13 00:00:41,660 --> 00:00:43,640 So I'll save that script. 14 00:00:43,670 --> 00:00:46,160 Only difference once again is this. 15 00:00:47,240 --> 00:00:51,410 So Python three, run the second script. 16 00:00:52,460 --> 00:00:59,630 This should give us our JSON information, so we should be able to get the JSON information back from 17 00:00:59,630 --> 00:01:00,800 the Nexus device. 18 00:01:01,220 --> 00:01:02,210 And there you go. 19 00:01:02,600 --> 00:01:03,200 So. 20 00:01:04,360 --> 00:01:05,290 Scrolling up. 21 00:01:06,070 --> 00:01:13,510 By using that single command, I've now been able to S-H to the device, retrieve the data. 22 00:01:14,110 --> 00:01:15,910 It's in JSON format. 23 00:01:15,940 --> 00:01:18,260 Notice double inverted commas. 24 00:01:18,280 --> 00:01:19,600 We've got a colon. 25 00:01:19,720 --> 00:01:21,340 We've got a comma at the end. 26 00:01:21,370 --> 00:01:24,400 Make sure you recognize this formatting. 27 00:01:24,400 --> 00:01:26,640 I've said it once again many times. 28 00:01:26,650 --> 00:01:29,800 If you don't have a colon there, there would be an incorrect answer. 29 00:01:29,830 --> 00:01:32,890 If this is a semicolon, that would be an incorrect answer. 30 00:01:32,920 --> 00:01:34,810 It has to look like this. 31 00:01:35,080 --> 00:01:37,150 No comma at the end here. 32 00:01:37,990 --> 00:01:38,260 Okay. 33 00:01:38,260 --> 00:01:40,420 But once again, that's just given us some data. 34 00:01:40,540 --> 00:01:50,260 Perhaps not that useful, but let's do something useful with the data now and let's get the prefix from 35 00:01:50,260 --> 00:01:52,950 the data and the interface. 36 00:01:52,960 --> 00:01:59,320 So basically I'm using a script now to pull back the first interface and the first IP address. 37 00:01:59,680 --> 00:02:02,950 The worry in the next script, I'm going to show you how to do that from multiple interfaces. 38 00:02:03,580 --> 00:02:07,450 So now, Liz, we've got two Python scripts. 39 00:02:07,450 --> 00:02:09,449 Let's create a third Python script. 40 00:02:09,460 --> 00:02:13,750 So Nano Python three dot p y. 41 00:02:13,960 --> 00:02:18,010 I'll paste the script in the stuff that we've added. 42 00:02:18,310 --> 00:02:26,230 Is this so we pulling back specific interface information now I have made done something. 43 00:02:26,230 --> 00:02:29,700 Badshah I'm using double inverted commas and single inverted commas in Python. 44 00:02:29,710 --> 00:02:31,840 You should standardize on one. 45 00:02:32,350 --> 00:02:37,000 I'll fix that in the script that I give you, but that's fine. 46 00:02:37,900 --> 00:02:40,930 Python will accept that even though it's not great practice. 47 00:02:41,260 --> 00:02:47,950 But hopefully what will happen now is this will connect to that Nexus device once again searching across 48 00:02:47,950 --> 00:02:50,410 the Internet and it's going to pull back. 49 00:02:50,950 --> 00:02:55,570 First interface, first IP address and then display that and there we go. 50 00:02:56,400 --> 00:02:56,530 Okay. 51 00:02:56,620 --> 00:03:04,060 So just to prove it, here's my Nexus device once again, first interface, first IP address. 52 00:03:05,950 --> 00:03:07,680 There's that information. 53 00:03:07,690 --> 00:03:10,960 Now, you might say, okay, but I want the state information. 54 00:03:10,960 --> 00:03:12,340 So something like this. 55 00:03:12,760 --> 00:03:15,190 And remember, we can simply edit that. 56 00:03:17,320 --> 00:03:18,430 Using our script. 57 00:03:18,850 --> 00:03:20,290 So let's edit the script. 58 00:03:20,830 --> 00:03:24,010 So rather than just seeing this data. 59 00:03:25,030 --> 00:03:30,730 What we said is we want to get protocol, state information, so we'll copy that line. 60 00:03:32,440 --> 00:03:32,830 Paste. 61 00:03:33,940 --> 00:03:44,410 And what we want is proto state is the name that they use and I'll save the script, so run it again. 62 00:03:44,740 --> 00:03:46,750 So we should get the protocol status. 63 00:03:46,750 --> 00:03:51,040 We should get the interface name, we should get the IP address. 64 00:03:52,180 --> 00:03:54,900 This, however, will only be for one interface. 65 00:03:54,910 --> 00:03:55,540 Next script. 66 00:03:55,540 --> 00:03:59,260 I'll change that and make it better. 67 00:03:59,560 --> 00:04:01,330 Now the formatting here is not great. 68 00:04:01,330 --> 00:04:02,860 I mean, that's just saying up. 69 00:04:03,130 --> 00:04:05,680 You could print out information. 70 00:04:05,690 --> 00:04:07,780 This is the whole idea with iteration. 71 00:04:07,780 --> 00:04:12,130 So rather than just saying that, you could say print interface. 72 00:04:14,220 --> 00:04:15,790 And while I'm here, let's fix this. 73 00:04:16,829 --> 00:04:22,410 I'd have to fix that for all the data to be consistent. 74 00:04:23,910 --> 00:04:25,560 I could do a fine and replace. 75 00:04:25,560 --> 00:04:27,840 I suppose they would actually make a lot more sense. 76 00:04:28,970 --> 00:04:30,200 Then doing it manually. 77 00:04:34,000 --> 00:04:38,470 But the idea in Python is something called Pep eight. 78 00:04:38,620 --> 00:04:42,770 Pep eight is talking about best practices. 79 00:04:42,790 --> 00:04:46,720 The moral of the story is be consistent so we could say print. 80 00:04:48,860 --> 00:04:49,970 IP address. 81 00:04:55,040 --> 00:04:56,120 Print. 82 00:04:56,980 --> 00:04:58,300 Protocol status. 83 00:05:00,250 --> 00:05:01,560 These are just examples. 84 00:05:01,570 --> 00:05:05,910 You could do what you wanted here, and this is the power of programming. 85 00:05:05,920 --> 00:05:09,050 You just change it the way that you want it to change. 86 00:05:09,730 --> 00:05:11,440 So it's got a problem. 87 00:05:11,440 --> 00:05:19,000 And this is my python to history getting to me in Python three. 88 00:05:19,480 --> 00:05:23,920 We need to use a function for print print as a function. 89 00:05:24,220 --> 00:05:26,230 So this needs to be in brackets. 90 00:05:26,920 --> 00:05:27,880 Save that. 91 00:05:27,880 --> 00:05:28,840 Run it again. 92 00:05:29,840 --> 00:05:37,730 Hopefully this once again will connect to that Nexus device and will tell us IP address, interface 93 00:05:37,730 --> 00:05:41,380 and protocol status and also showed in a little bit nicer format. 94 00:05:41,390 --> 00:05:42,410 So here we go. 95 00:05:42,410 --> 00:05:43,970 There's the output of that script. 96 00:05:44,420 --> 00:05:48,080 Now you might say, okay, but I want the information for all interfaces. 97 00:05:48,080 --> 00:05:53,330 So I've got the script across two PowerPoint slides here. 98 00:05:53,990 --> 00:05:58,010 What I'm doing here is creating a loop. 99 00:05:58,520 --> 00:06:01,910 So we are all using a for loop here. 100 00:06:02,910 --> 00:06:07,080 What we're doing is getting the length of the rows. 101 00:06:07,080 --> 00:06:09,060 So how many rows are there? 102 00:06:09,390 --> 00:06:17,940 So if we jump back onto the device, so this is going directly to the device show IP interface brief 103 00:06:17,940 --> 00:06:19,170 JSON pretty. 104 00:06:20,110 --> 00:06:28,270 Row interface tells us how many interfaces they are one, two, three, four, etc.. 105 00:06:28,750 --> 00:06:30,820 Show IP interface brief would just show us that. 106 00:06:30,820 --> 00:06:32,350 So here are all the interfaces. 107 00:06:32,830 --> 00:06:42,430 This length command allows me to work out how many interfaces they are, and then it just loops those 108 00:06:42,430 --> 00:06:44,710 commands for the number of interfaces that we've got. 109 00:06:45,490 --> 00:06:45,730 Okay. 110 00:06:45,730 --> 00:06:47,020 So first thing is. 111 00:06:48,690 --> 00:06:51,650 Knit Mico configuration. 112 00:06:51,660 --> 00:06:57,660 So Liz, we are now working on a Python script for a Python forward API. 113 00:06:58,290 --> 00:07:03,450 I'll paste that in that basically once again just allows me to connect to the device. 114 00:07:03,730 --> 00:07:06,750 Didn't have enough space in PowerPoint. 115 00:07:09,060 --> 00:07:12,510 I'll copy this into the VM now. 116 00:07:12,960 --> 00:07:19,830 So the big difference now is it's using the command and then finding out how many interfaces there are 117 00:07:19,830 --> 00:07:25,830 and then using a loop to basically run these commands multiple times for the number of interfaces that 118 00:07:25,830 --> 00:07:26,490 we have. 119 00:07:27,240 --> 00:07:31,860 So clear the screen Python three, Python four dot p y. 120 00:07:31,890 --> 00:07:37,950 This should hopefully now give us IP address an interface name for all the interfaces on that device. 121 00:07:38,820 --> 00:07:42,780 And to prove it, I'll create some extra interfaces and run the script again and we should see that. 122 00:07:44,230 --> 00:07:45,150 So there you go. 123 00:07:45,160 --> 00:07:49,210 All the interfaces on the device and the IP addresses. 124 00:07:49,450 --> 00:07:55,810 So if I show that side by side, there are all the interfaces on the device and the IP addresses. 125 00:07:56,050 --> 00:07:57,460 But let's create another loopback. 126 00:07:57,460 --> 00:08:01,960 So let's create a loopback to IP address. 127 00:08:01,960 --> 00:08:04,510 Two, two, two, two, slash. 128 00:08:06,170 --> 00:08:18,260 Three Mosque interface loop three IP address slash 32 mosque show IP interface brief. 129 00:08:18,290 --> 00:08:22,460 I've just created two additional loopback interfaces. 130 00:08:23,390 --> 00:08:24,860 So run that script again. 131 00:08:25,370 --> 00:08:30,440 This is once again connecting to that device in dev net and pulling back the information. 132 00:08:30,440 --> 00:08:31,430 And there you go. 133 00:08:31,460 --> 00:08:37,010 Additional loopback interfaces are shown just to prove it once more. 134 00:08:37,490 --> 00:08:40,610 Last interface loopback for IP address. 135 00:08:42,230 --> 00:08:50,630 Quadruple for show IP interface brief new interfaces created run the script again. 136 00:08:50,630 --> 00:08:55,610 We didn't previously have loopback for in the output here, but hopefully we will now. 137 00:08:56,270 --> 00:08:57,170 And there we go. 138 00:08:58,680 --> 00:09:00,870 So why are we using JSON? 139 00:09:00,900 --> 00:09:05,190 Much easier to work with this kind of data when you've got a Python script. 140 00:09:05,220 --> 00:09:12,420 It's very difficult to find information if it's a string, if it's just data that's in an formatted 141 00:09:12,420 --> 00:09:13,140 format. 142 00:09:13,140 --> 00:09:21,420 So if it's just some kind of data that's like this capture, not easy for a machine to read that we 143 00:09:21,420 --> 00:09:26,370 want to put it in a format that's easy for a machine to query and interpret. 144 00:09:26,400 --> 00:09:30,990 Your Python scripts are going to be so much easier if the data is in JSON. 145 00:09:31,020 --> 00:09:31,920 Trust me. 146 00:09:32,010 --> 00:09:37,470 Try and do that kind of stuff with just strings and parsing the string, trying to find where the data 147 00:09:37,470 --> 00:09:39,060 is and extracting a piece of data. 148 00:09:39,090 --> 00:09:45,570 It's very hard to do that with traditional mechanisms, so much easier if the data is correctly formatted 149 00:09:45,570 --> 00:09:48,750 using JSON or even XML or YAML. 150 00:09:49,200 --> 00:09:53,400 Big idea for doing this is to make it easy for machines to read. 151 00:09:54,150 --> 00:09:54,390 Okay. 152 00:09:54,390 --> 00:09:55,350 So hopefully you've learned something. 153 00:09:55,380 --> 00:09:58,740 I went to quite a bit of detail there with regards to the Python scripts. 154 00:09:58,830 --> 00:10:03,870 You don't have to learn Python for the exam, but for the real world, I'd highly recommend it.