1 00:00:01,000 --> 00:00:05,130 In the apology we have two routers and two PCs. 2 00:00:05,230 --> 00:00:09,220 This is a newly configured typology. 3 00:00:09,340 --> 00:00:13,770 The rod is just booted up and have no configuration. 4 00:00:13,780 --> 00:00:23,350 So for example show IP interface brief on Rotto one shows that all interfaces are shut down and no IP 5 00:00:23,350 --> 00:00:25,110 addresses are configured. 6 00:00:25,690 --> 00:00:33,730 What I'll do is no shut interface serial to slash zero the wanting to face on a one and I'll do something 7 00:00:33,730 --> 00:00:42,800 similar on Radha to get it to also has no configuration so no shut 8 00:00:46,830 --> 00:00:55,810 show IP interface brief as you can see the interfaces are up on both sides. 9 00:01:02,440 --> 00:01:05,270 Show interface serial to slash a zero. 10 00:01:06,500 --> 00:01:13,640 What I'd like to point out is the kept isolation used which is Dayle see by default on Cisco routers 11 00:01:14,000 --> 00:01:20,010 serial interfaces use HTL see as the encapsulation. 12 00:01:20,010 --> 00:01:26,040 So what we could do is go into that interface and give the rod an IP address of say 10 to one or two 13 00:01:26,040 --> 00:01:36,630 to one and use a slash 30 mosque will do something similar on router to IP Address tendered one to two 14 00:01:36,640 --> 00:01:37,260 to two 15 00:01:40,710 --> 00:01:42,010 Ken Rodda one thing right. 16 00:01:42,050 --> 00:01:47,930 Two yes it can can route a two ping Route 1. 17 00:01:48,480 --> 00:01:53,630 Yes it can show run interface serial to slash is zero. 18 00:01:54,060 --> 00:01:57,180 All we had to do was know shut the interface. 19 00:01:57,180 --> 00:02:00,910 We didn't have to configure an encapsulation. 20 00:02:00,960 --> 00:02:05,140 We didn't have to configure clock rate you only have to configure a clock rate. 21 00:02:05,160 --> 00:02:13,530 If you using a back to back cable and your router is the DC side of the cable here both sides of the 22 00:02:13,530 --> 00:02:14,680 DTV. 23 00:02:14,820 --> 00:02:18,180 So we didn't have to configure a clock rate. 24 00:02:18,180 --> 00:02:21,490 Let's have a look at HPLC frames. 25 00:02:21,700 --> 00:02:23,340 So do we shock capture 26 00:02:26,320 --> 00:02:34,360 on ones serial interface. 27 00:02:34,560 --> 00:02:40,100 What we can see here is the protocol Schoeni slop 28 00:02:44,630 --> 00:02:50,560 but notice we've got H.M.S. and then the Siska slop protocol which is used for configuration. 29 00:02:50,720 --> 00:03:01,270 Here we have SCDP message so Cisco HDL seizing kept isolation used at least to noticed the protocol 30 00:03:01,750 --> 00:03:09,500 is referenced as 2000 which is Cecka discovery protocol and we can see information about the device. 31 00:03:09,500 --> 00:03:24,010 So Rotto one he's a 37 25 and is using interface serial to slash 0 his Rodek to also using serial interface 32 00:03:24,040 --> 00:03:28,020 to slash zero. 33 00:03:28,270 --> 00:03:29,290 If you do a ping 34 00:03:33,250 --> 00:03:38,930 we should see I see MP and there we go. 35 00:03:39,020 --> 00:03:41,240 So I see MP 36 00:03:43,960 --> 00:03:46,160 Atli to it's once again HD see. 37 00:03:46,170 --> 00:03:53,960 So if we look at the actual frame being kept isolation type is a deal see it's not ethernet so on those 38 00:03:54,050 --> 00:03:57,670 wanting to face we using an HDL C encapsulation. 39 00:03:58,010 --> 00:04:06,920 Notice the protocol reference is the famous x 0 x 800 which means IP version for at least three years 40 00:04:06,970 --> 00:04:12,080 IP version for you can see the source IP address and destination IP address in the packet 41 00:04:15,850 --> 00:04:19,950 the protocol Sainty So I see impy you can see it's an echo. 42 00:04:20,000 --> 00:04:23,610 He has the ECA reply scrolling back to the top. 43 00:04:23,630 --> 00:04:27,800 It's once again HTL see there's the protocol type. 44 00:04:28,240 --> 00:04:36,590 So the IP address is 10 1 1 2 going to 10 1 to 1 and it's an echo reply. 45 00:04:39,230 --> 00:04:49,990 So Cisco HTL C C D HDL C has this particle field denoting the Hialeah protocol that's IP version for 46 00:04:51,300 --> 00:04:53,490 let's configure IP version 6. 47 00:04:53,490 --> 00:05:06,660 So IPV 6 address 2001 colon colon one colon colon one slash 64 on roaded to interface serial to slashes 48 00:05:06,700 --> 00:05:19,110 zero IPV six address three thousand and one colon one colon colon two slash 64 so paying 2001 Colan 49 00:05:19,170 --> 00:05:26,130 one colon to Ping's succeeds in y shock capture. 50 00:05:26,350 --> 00:05:33,630 We see the ICMP messages. 51 00:05:33,670 --> 00:05:40,010 So this is the ping from Rodda one to rodded to notice the protocol type 86 Dee-Dee. 52 00:05:40,120 --> 00:05:48,160 It's a different protocol type IP version for Cisco HDL HDFC logic to run multiple Hialeah protocols 53 00:05:48,580 --> 00:05:52,900 across the same link because of this protocol field. 54 00:05:52,900 --> 00:06:04,840 So once again there is IP version 6 and scrolling up here is IP version for and here is CGP all using 55 00:06:04,990 --> 00:06:07,640 different protocol types. 56 00:06:07,690 --> 00:06:12,970 So the layer to encapsulation here is referencing a Hialeah protocol. 57 00:06:13,540 --> 00:06:16,970 We would see something similar on an Ethernet frame. 58 00:06:17,170 --> 00:06:28,770 So on Rotto one interface if the zero slushes zero no Schutt IP address 10 1 1 1 2 4 5 2 4 5 2 4 5 0 59 00:06:29,750 --> 00:06:36,750 on the PC will give it an IP address of 10 to 1 to 1 but 11 with the mosque 60 00:06:39,570 --> 00:06:52,360 and all set the gateway to 10 to 1 1 to 1 so paying $10 1 to 1 PC can ping Rato 1. 61 00:06:52,410 --> 00:07:01,150 And if we start to capture on that interface so we're going to capture traffic on the router. 62 00:07:01,210 --> 00:07:05,770 Notice the frame is Ethernet to let's send a ping again. 63 00:07:06,770 --> 00:07:08,900 So there is an ICMP packet. 64 00:07:08,900 --> 00:07:21,040 Notice the protocol type for IP version for is zero or 800 which is what we saw on the HTL see frame. 65 00:07:21,050 --> 00:07:22,250 So here's the deal see. 66 00:07:22,320 --> 00:07:23,990 Notice the particle field. 67 00:07:24,350 --> 00:07:32,340 So when you send packets across a router the shoji quite clearly that relate to encapsulation changes. 68 00:07:32,350 --> 00:07:40,280 But the high layer protocols are maintained or kept encapsulation used cheare is Ethernet to be kept 69 00:07:40,280 --> 00:07:47,660 solution used here is HTL see encapsulation here would be Ethernet to once again. 70 00:07:47,870 --> 00:07:56,990 In this example somebody to interface if zero slashes zero no Shutt IP address turned out one to 3 to 71 00:07:57,140 --> 00:08:01,170 one as an example. 72 00:08:01,250 --> 00:08:11,340 PC to IP Address tendered one to three or 12 put the mosque in default gateway 73 00:08:14,030 --> 00:08:17,940 paying $10 one to three to one that works. 74 00:08:19,710 --> 00:08:29,460 Only enable writing protocol here quickly to allow the writers to talk to each other and this will give 75 00:08:29,460 --> 00:08:33,000 us another protocol to capture in why shark 76 00:08:37,050 --> 00:08:39,810 so enable people from all interfaces. 77 00:08:41,780 --> 00:08:48,210 Sort of capture on the scene to face. 78 00:08:48,350 --> 00:08:54,530 So we have three Why shot captures going serial interface the safety net interface and the see the NET 79 00:08:54,530 --> 00:09:05,970 interface PC one should always be has converged be able to ping PC to which it can so the pings are 80 00:09:05,970 --> 00:09:08,370 succeeding. 81 00:09:08,410 --> 00:09:14,690 Let's have a look at the frame over here on the Ethan It segment. 82 00:09:14,820 --> 00:09:22,890 So there's the frame you can see the Ethan a type is Ethan a two source MAC address destination MAC 83 00:09:22,890 --> 00:09:29,630 address which is the Rodda protocol these are provision for just to prove that that serrata 84 00:09:32,260 --> 00:09:38,960 show interface 0 0. 85 00:09:39,130 --> 00:09:42,220 Notice the MAC address is C 2 0 1 86 00:09:45,290 --> 00:09:49,870 3 0 8 0 0 0 0 which is correct. 87 00:09:50,690 --> 00:09:57,130 So the PC is sending the traffic to the local router using Ethernet too. 88 00:09:57,140 --> 00:10:06,320 In other words Ethernet encapsulation at least three the source and destination are the two PCs on the 89 00:10:06,370 --> 00:10:08,450 HD all see capture 90 00:10:12,180 --> 00:10:20,420 there's the same IP addresses of the PCs at least three but notice at least two being kept isolation 91 00:10:20,420 --> 00:10:27,350 is HTL see and there are no MAC addresses MAC addresses only used on Ethernet. 92 00:10:27,440 --> 00:10:32,760 They're not used in HDL C HDL C links are point to point. 93 00:10:32,870 --> 00:10:38,780 There's no need to have MAC addresses anything that you send out of this interface is going to arrive 94 00:10:38,780 --> 00:10:45,870 at this interface and vice versa whereas Ethernet allows a multiple devices to connect to the same segment. 95 00:10:46,160 --> 00:10:56,200 So there's no need to have MAC addresses in HDL C. It simply references the Hialeah protocol and specifies 96 00:10:56,200 --> 00:10:58,920 that this is a unicast packet. 97 00:10:58,930 --> 00:11:03,820 What about on the side. 98 00:11:03,840 --> 00:11:09,890 So here's the pain source and destination IP addresses are the same. 99 00:11:09,900 --> 00:11:12,400 Notice however that it's Ethernet once again. 100 00:11:12,400 --> 00:11:25,130 So Ethan it too in this case the source MAC address is Rodda to show interface fast Ethernet is 0 0. 101 00:11:25,380 --> 00:11:33,140 Notice the MAC address see 2 0 2 3 8 4 zeros. 102 00:11:33,250 --> 00:11:41,830 That's the router talking to the PC in this case PC to the Ethan that type field specifies IP version 103 00:11:41,830 --> 00:11:49,420 for the highly protocol and he has an IP packet and he has the I see MP information 104 00:11:52,740 --> 00:12:01,460 being kept selection changes on every link MAC addresses are used on the Ethernet segments MAC addresses 105 00:12:01,460 --> 00:12:03,740 are not used in HDL C.