1 00:00:01,770 --> 00:00:09,090 Now what is in a V in a V or network functions virtualization is the idea that you virtualize and network 2 00:00:09,150 --> 00:00:12,410 devices and network functions. 3 00:00:12,420 --> 00:00:14,730 Here's a document explaining in a V. 4 00:00:14,730 --> 00:00:18,620 And it's very good if you're interested in getting into the details. 5 00:00:18,640 --> 00:00:25,500 This is from the SD and an open floor World Congress in 2012. 6 00:00:25,500 --> 00:00:29,190 But you don't need to spend a lot of time going through this document. 7 00:00:29,220 --> 00:00:31,290 That's only of interest. 8 00:00:31,500 --> 00:00:40,150 I'll explain briefly what NFC is for the CCMA exam servers have been virtualize for years so as an example 9 00:00:40,220 --> 00:00:42,720 here I'm running a Cisco call manager 10 00:00:45,440 --> 00:00:53,780 as a virtual machine in yes exciting and I can connect to that server as an example using a web browser 11 00:00:54,350 --> 00:01:01,280 and then configure the server servers are now virtualizing in the cloud and I can spin up instances 12 00:01:01,280 --> 00:01:12,140 of servers very very quickly using Amazon easy to or Microsoft Azure or the Google cloud networking 13 00:01:12,140 --> 00:01:18,670 however has generally in the past sold physical boxes for functions. 14 00:01:18,670 --> 00:01:24,440 So in other words if you wanted a firewall you would buy a physical piece of hardware that provides 15 00:01:24,680 --> 00:01:27,650 a function or a set of functions to you. 16 00:01:27,730 --> 00:01:35,120 In this case firewall ing if you wanted a VPN device in the past you would buy a VPN concentrator or 17 00:01:35,120 --> 00:01:40,760 a device dedicated to creating VPN connections in the past. 18 00:01:40,770 --> 00:01:47,570 If you wanted a load balancer you would buy a physical load balancer or a session border controller 19 00:01:47,730 --> 00:01:55,170 you would buy a physical device for that function rudders such as a p rather of physical devices. 20 00:01:55,170 --> 00:01:58,150 If you want a router you would buy a physical rudder. 21 00:01:58,320 --> 00:02:06,480 Now the idea with network virtualization is we virtualize network devices in the same way that we virtualize 22 00:02:06,540 --> 00:02:07,870 servers. 23 00:02:08,100 --> 00:02:15,840 So we take these physical devices and we run them as virtual appliances on physical servers. 24 00:02:15,840 --> 00:02:18,750 And here's an example once again of doing that. 25 00:02:18,750 --> 00:02:28,290 I've got a single physical server running iOS 6 I bet here I've got multiple Cisco CSR routers running 26 00:02:29,770 --> 00:02:40,240 as virtual machines in iOS 6 I use the Come on show IPO SPF neighbor notice I see multiple neighbor 27 00:02:40,240 --> 00:02:41,010 relationships. 28 00:02:42,210 --> 00:02:46,920 So this device 1 9 2 1 6 8 1 2 or 3 is a physical router. 29 00:02:46,950 --> 00:02:53,150 So what I'll do is Telnet to that physical Rada and I'll log in. 30 00:02:53,160 --> 00:03:01,560 Notice this is in 1841 so show version shows me that this is in 1841 physical Rada showed dialogue as 31 00:03:01,560 --> 00:03:11,000 an example shows me the physical components in that Rada but back on the E6 I rather show version shows 32 00:03:11,000 --> 00:03:15,080 me that this is a all Rada showed Di eg 33 00:03:18,550 --> 00:03:20,530 doesn't show the same information 34 00:03:28,410 --> 00:03:35,170 because this is a virtual router not a physical Rada you can see as an example that it's a CSR 1000 35 00:03:35,250 --> 00:03:42,510 V so show IPO SPF neighbour once again shows me different neighbour relationships and I could Telnet 36 00:03:43,080 --> 00:03:44,430 to a another Roorda 37 00:03:48,280 --> 00:03:52,460 this Rada is a 1941. 38 00:03:52,720 --> 00:03:55,930 So this is another physical rather. 39 00:03:56,080 --> 00:04:02,880 So what's the point rather than running physical Rodders. 40 00:04:03,060 --> 00:04:12,630 Why not run multiple virtual routers in the same way that you run the virtual service the concept of 41 00:04:12,930 --> 00:04:20,540 having a physical device for every function doesn't make sense in today's world as I demonstrated. 42 00:04:20,540 --> 00:04:27,920 It only takes a few minutes to spin up a virtual machine on Amazon it's been easy in the past to spin 43 00:04:27,920 --> 00:04:34,130 up virtual servers and allocate a virtual disk space or storage but one of the big problems in the past 44 00:04:34,160 --> 00:04:42,720 has been that networking required physical devices so just like years ago server administrators no longer 45 00:04:43,080 --> 00:04:49,770 have a physical server per application such as e-mail or Web services. 46 00:04:49,920 --> 00:04:59,730 We know in networking don't have a physical device for a physical function we can run virtual routers 47 00:04:59,760 --> 00:05:08,980 and virtual firewalls as virtual machines alongside our virtual servers one of the advantages of doing 48 00:05:08,980 --> 00:05:16,150 that as an example is you could run a virtual firewall in front of every virtual server if you needed 49 00:05:16,150 --> 00:05:16,930 to. 50 00:05:16,990 --> 00:05:23,980 You can implement what's called micro segmentation where you segmented your network down into tiny subnets 51 00:05:23,980 --> 00:05:31,420 or tiny segments to reduce broadcasts to implement better security and other benefits. 52 00:05:31,420 --> 00:05:37,730 It doesn't make sense today to have a physical network device for every function. 53 00:05:37,840 --> 00:05:44,110 If you have the requirement for a firewall it doesn't make sense to buy a physical firewall for your 54 00:05:44,110 --> 00:05:45,270 virtual servers. 55 00:05:45,310 --> 00:05:52,570 In some cases it makes sense to buy a virtual firewall that you run on the same hypervisor as your virtual 56 00:05:52,570 --> 00:05:54,120 service. 57 00:05:54,160 --> 00:05:57,110 So this is the idea of network function virtualization. 58 00:05:57,210 --> 00:06:04,450 We firstly virtualize an appliance such as a rider or a firewall or a load balancer but then taking 59 00:06:04,450 --> 00:06:05,840 it a step further. 60 00:06:06,040 --> 00:06:08,810 We can also load balance functions. 61 00:06:09,070 --> 00:06:14,950 So if all you need is to implement something such as VR or LP or H.S. or P It doesn't make sense to 62 00:06:14,950 --> 00:06:18,850 run a full operating system in the server world. 63 00:06:18,850 --> 00:06:26,290 We have the concept of Docker and the same kind of ideas now starting to happen in networking where 64 00:06:26,290 --> 00:06:30,550 we just run functions rather than entire operating systems. 65 00:06:30,550 --> 00:06:33,250 I've added some videos about Docker to the course. 66 00:06:33,250 --> 00:06:38,060 They are only of interest and are not part of the CCMA exam. 67 00:06:38,200 --> 00:06:42,820 So if you're interested in learning some real world stuff about Docker and newer technologies have a 68 00:06:42,820 --> 00:06:43,810 look at those videos.