1 00:00:00,820 --> 00:00:04,270 So he has rather three show IP protocols. 2 00:00:04,420 --> 00:00:12,370 Shows me that no protocols are enabled, so no routing has been enabled on this router rather IP. 3 00:00:13,730 --> 00:00:16,309 100 network. 4 00:00:16,309 --> 00:00:26,990 So I'm going to enable IGP on this interface 10.1 102.3 and I'll do this specifically down to IP address 5 00:00:26,990 --> 00:00:28,520 using an inverse mosque. 6 00:00:28,730 --> 00:00:32,540 So I'm only going to enable IGP on this interface. 7 00:00:32,900 --> 00:00:35,690 Notice to neighbor relationships have been established. 8 00:00:35,900 --> 00:00:42,740 Router three has a neighbor relationship established to switch one over here as well as to switch to 9 00:00:42,740 --> 00:00:44,090 shown over here. 10 00:00:45,220 --> 00:00:50,530 The reason why it forms a neighbor relationship with both switches is because router three is connected 11 00:00:50,530 --> 00:00:51,940 to VLAN one. 12 00:00:51,940 --> 00:00:56,050 So there's a layer two connection all the way through to switch one. 13 00:00:56,050 --> 00:00:58,900 This router once again doesn't exist in the topology. 14 00:00:59,260 --> 00:01:07,780 It simply represents a virtual HSP router, so that router doesn't actually exist in the topology at 15 00:01:07,780 --> 00:01:08,200 all. 16 00:01:09,940 --> 00:01:16,390 Wrote a three once again has a layer two connection to switch one as well as switch to so hence it forms 17 00:01:16,390 --> 00:01:17,910 a neighbor relationship with both. 18 00:01:17,920 --> 00:01:22,900 So do show IP err GOP neighbor. 19 00:01:23,230 --> 00:01:31,600 We can see our two neighbor relationships both formed on fast ethernet zero zero do show IP protocols. 20 00:01:32,140 --> 00:01:38,230 We can see as an example that it's routing for this network and it's got two gateways. 21 00:01:38,560 --> 00:01:43,240 Automatic summarization, however, on this router is enabled by default. 22 00:01:43,600 --> 00:01:48,730 So I'm going to type no order summary to disable automatic summarization. 23 00:01:48,850 --> 00:01:55,570 The neighbor relationship reconfigures and we can see that automatic summarization is now disabled. 24 00:01:55,870 --> 00:01:58,420 Do show IP route. 25 00:02:00,280 --> 00:02:07,420 We can see that the Rada has learnt about two routes through air GOP. 26 00:02:09,120 --> 00:02:18,150 It's learnt about network 10.1 or 10.0 via both switches and it's learnt about Network 10.1 or 20.0 27 00:02:18,180 --> 00:02:20,000 from both switches. 28 00:02:20,010 --> 00:02:26,640 So in other words, this router has two ways to get to VLAN ten and VLAN 20. 29 00:02:26,880 --> 00:02:32,280 Now let's test some connectivity on router one, which is this device over here. 30 00:02:34,580 --> 00:02:36,170 Show IP rot. 31 00:02:37,100 --> 00:02:41,240 It has a default gateway pointing to the ISP router. 32 00:02:41,240 --> 00:02:42,620 And in this case. 33 00:02:45,260 --> 00:02:50,780 So which one should be the active router for HSP on that VLAN? 34 00:02:50,810 --> 00:02:55,280 So on VLAN ten, the local router is the active router. 35 00:02:55,520 --> 00:02:59,330 So switch one is acting as the active router for HSP. 36 00:03:00,210 --> 00:03:10,590 So let's check if rata one acting as PC one can ping other VLAN addresses attended 1.101 is it able 37 00:03:10,590 --> 00:03:15,870 to ping this VLAN vlan one on switch one and it can in this example. 38 00:03:15,900 --> 00:03:18,980 What about 253 router three? 39 00:03:18,990 --> 00:03:24,060 So this router can now ping this IP address on router three. 40 00:03:24,730 --> 00:03:27,200 Let's add a network to the topology. 41 00:03:27,220 --> 00:03:31,720 So I'll create a loopback on router three of quadruple three. 42 00:03:34,200 --> 00:03:37,020 Can this PC ping that address? 43 00:03:37,890 --> 00:03:39,440 And at the moment, it can't. 44 00:03:39,450 --> 00:03:41,610 It's getting unreachable messages. 45 00:03:42,780 --> 00:03:44,130 Let's see from who. 46 00:03:44,160 --> 00:03:48,990 So debug ip icmp do that ping again. 47 00:03:50,220 --> 00:03:55,660 Rather three is getting an unreachable message from 10.1 to 10.1. 48 00:03:55,680 --> 00:04:00,750 In other words, switch one, switch one doesn't know about quadruple three. 49 00:04:00,870 --> 00:04:09,840 So this router acting as a PC is forwarding the traffic to the HP virtual router. 50 00:04:10,290 --> 00:04:15,930 That traffic is being forwarded by switch one, but switch one doesn't know about this loopback that 51 00:04:15,930 --> 00:04:18,000 we configured on router three. 52 00:04:18,180 --> 00:04:22,230 And that's because that route is not being advertised in air copy. 53 00:04:22,230 --> 00:04:26,220 And we can see that by using the command do show IP protocols. 54 00:04:26,490 --> 00:04:29,640 Only Network ten is being advertised. 55 00:04:30,240 --> 00:04:31,950 We can also look at the running config. 56 00:04:31,950 --> 00:04:36,210 So do show run pipe section IGP. 57 00:04:36,780 --> 00:04:41,580 We have only enabled IGP on this interface. 58 00:04:43,210 --> 00:04:50,320 We didn't enable IRP on the loopback of router three. 59 00:04:51,850 --> 00:05:02,110 So I'd rather three rather ERP 100 network quadruple three and I will match it exactly. 60 00:05:04,090 --> 00:05:05,410 So Showrun. 61 00:05:06,260 --> 00:05:08,830 Section II GOP. 62 00:05:08,840 --> 00:05:15,890 We have now advertised that network in GOP does switch one now know about that network. 63 00:05:16,250 --> 00:05:18,470 So show IP route on switch one. 64 00:05:18,500 --> 00:05:19,670 Yes, it does. 65 00:05:19,760 --> 00:05:27,290 It's learning about that network from ten .1. 100 253, which is router three. 66 00:05:27,500 --> 00:05:33,110 So can router one acting as our PC now ping quadruple three. 67 00:05:33,650 --> 00:05:37,400 Previously this didn't work, but notice now it does work. 68 00:05:37,670 --> 00:05:39,050 So the ping. 69 00:05:40,500 --> 00:05:41,490 Succeeds. 70 00:05:42,570 --> 00:05:45,570 Debug is just showing that output do the ping again. 71 00:05:45,720 --> 00:05:54,540 Rather one is now able to ping rather three of via and this is the important piece of via its HSP default 72 00:05:54,540 --> 00:05:55,230 gateway. 73 00:05:56,730 --> 00:06:00,780 Ken brought it to acting as PC to ping that loopback as well. 74 00:06:01,320 --> 00:06:02,850 So let's test that. 75 00:06:03,570 --> 00:06:06,570 Here's router to show IP route. 76 00:06:06,630 --> 00:06:13,140 Notice no routes are shown because on this router I disabled. 77 00:06:15,270 --> 00:06:16,200 IP routing. 78 00:06:16,200 --> 00:06:19,170 So show run pipe include IP route. 79 00:06:19,560 --> 00:06:26,040 Notice the IP routing command is disabled, so just do a show run without piping so that you can see 80 00:06:26,040 --> 00:06:27,960 where it is in the config. 81 00:06:28,440 --> 00:06:33,720 Notice no IP routing is disabled on this router. 82 00:06:35,740 --> 00:06:41,440 So what we did in a previous video is specify a default gateway. 83 00:06:42,100 --> 00:06:49,900 So this command was added to the configuration show run pipe include default allows me to see that so 84 00:06:49,900 --> 00:06:56,140 this root is now acting as a PC and it can also ping this loopback. 85 00:06:56,440 --> 00:07:02,110 The IP default gateway command is only used when IP routing is disabled on a router. 86 00:07:02,350 --> 00:07:06,280 If you have IP routing enabled, then you need to use. 87 00:07:08,190 --> 00:07:15,570 The IP route command to create a default gateway like we did here on router one. 88 00:07:16,470 --> 00:07:24,450 So basically we now have full connectivity between these devices in the topology, these routers, camping 89 00:07:24,840 --> 00:07:25,770 router three. 90 00:07:26,040 --> 00:07:32,400 The next step is to advertise a default route in router three so that these two switches have router 91 00:07:32,400 --> 00:07:34,050 three is their default gateway. 92 00:07:34,290 --> 00:07:40,950 And we need that because we want to configure NAT on router three to allow these devices to connect 93 00:07:40,950 --> 00:07:42,420 to devices on the internet.