1 00:00:00,890 --> 00:00:04,980 There are two main types of encapsulation that we'll discuss in the course. 2 00:00:05,000 --> 00:00:09,850 The first one is H Dale deal see more high level data link control. 3 00:00:09,920 --> 00:00:17,360 This is THE LEAD TO encapsulation once again that can be used across a leased line providing layer one 4 00:00:17,480 --> 00:00:21,760 service or connectivity from one site to another. 5 00:00:21,760 --> 00:00:28,490 Now you need to be aware that Cisco have extended the industry stented a version of HDL C by adding 6 00:00:28,490 --> 00:00:31,910 an extra field called the type field. 7 00:00:31,910 --> 00:00:38,830 HDL C is a very simple encapsulation and I'll demonstrate a why shock capture of the frame in a moment. 8 00:00:39,020 --> 00:00:45,350 But as an example we have a flag field address field control field and a frame check sequence field. 9 00:00:45,360 --> 00:00:48,710 So I have added a type field to the frame. 10 00:00:48,710 --> 00:00:54,000 So this is different to the ISO industry standard HPLC protocol. 11 00:00:54,290 --> 00:01:00,440 So it's good devices to use the Cisco HDL C or C HDL C version by default. 12 00:01:00,440 --> 00:01:06,590 And you'll notice it's very easy to set up a serial link using this encapsulation essentially just have 13 00:01:06,590 --> 00:01:12,290 to put an IP address on your rhotic interfaces and no shut the interfaces to get them to communicate 14 00:01:12,290 --> 00:01:17,450 with each other if you want to connect Cisco routers to non Cisco routers. 15 00:01:17,570 --> 00:01:24,830 You're going to want to change it kept isolation to BPP which is an industry standard version of encapsulation. 16 00:01:24,830 --> 00:01:32,660 Now the reason why Cisco added the proprietary field is to allow multiple Hialeah protocols to traverse 17 00:01:32,660 --> 00:01:34,670 the link at the same time. 18 00:01:34,700 --> 00:01:42,680 So in other words if you want to run like provision for an IP version 6 across a serial link simultaneously 19 00:01:43,130 --> 00:01:50,150 the routers need a time field to differentiate the frames that belong to IP version 4 poses the frames 20 00:01:50,150 --> 00:01:52,350 that belong to IP version 6. 21 00:01:52,700 --> 00:01:57,260 When the rodder receives an IP version 4 packet across a serial link. 22 00:01:57,260 --> 00:02:03,890 So in this example Rodda two receives an IP version for packet from Rodda one rodded to needs to know 23 00:02:04,340 --> 00:02:10,000 that that packet should be processed by the IP version 4 protocol stack on the router. 24 00:02:10,430 --> 00:02:17,420 When it receives a IP version 6 packet it needs to know that the packet is destined to the IP version 25 00:02:17,420 --> 00:02:22,710 6 protocol stack and thats what the Topfield provides. 26 00:02:22,730 --> 00:02:29,540 It essentially allows the routers to differentiate between multiple higher layer protocols and hence 27 00:02:29,630 --> 00:02:33,690 Cisco extended the protocol to allow that functionality. 28 00:02:33,890 --> 00:02:40,830 The industry stented version of HGL C doesn't have that type field denoting Hialeah protocols. 29 00:02:40,920 --> 00:02:47,090 It's very simple to configure HDL C between two broad as you would type as an example in Rotto one enable 30 00:02:47,350 --> 00:02:50,130 confetti interface and the role of an interface. 31 00:02:50,150 --> 00:02:56,450 In this example Sariel 1 slash zero you would configure the IP address on the serial interface. 32 00:02:56,690 --> 00:03:05,060 So IP address tend to wander to that one with the mosque 2 4 5 2 5 2 4 5 2 5 2 as an example which would 33 00:03:05,060 --> 00:03:06,970 be better than slushed 24. 34 00:03:07,130 --> 00:03:08,600 And then you specify encapsulation. 35 00:03:08,600 --> 00:03:16,400 HDL C so it's as simple as that to configure HTL see what you type is encapsulation HPLC and that is 36 00:03:16,400 --> 00:03:18,420 done by default for you. 37 00:03:18,590 --> 00:03:20,820 So you don't actually need to configure that at all.