1 00:00:00,360 --> 00:00:01,140 On three. 2 00:00:01,140 --> 00:00:08,910 We told to enable OSPF using the interface command so we're not going to use the network command on 3 00:00:08,910 --> 00:00:17,550 router three years writer three Show IP interface brief shows us the interfaces and IP addresses configured. 4 00:00:17,670 --> 00:00:22,260 We've got gigabit at zero zero and gigabit zero one. 5 00:00:23,200 --> 00:00:25,120 So confetti, rather. 6 00:00:25,660 --> 00:00:26,950 OSPF won. 7 00:00:27,250 --> 00:00:33,760 Now, the difference is we go on to the interfaces and here we use the command ip ospf. 8 00:00:34,150 --> 00:00:39,430 We need to specify the process ID that we previously configured. 9 00:00:39,430 --> 00:00:45,820 So one and then we specify the area to put that interface into. 10 00:00:46,330 --> 00:00:56,890 So gigabit is zero, zero is now in area zero gigabit is zero one up key twice put to that into OSPF 11 00:00:56,890 --> 00:00:58,360 area zero. 12 00:00:59,620 --> 00:01:02,700 I can do the same thing with a loopback interface. 13 00:01:02,710 --> 00:01:06,190 Put that into OSPF area zero. 14 00:01:08,020 --> 00:01:19,780 So show run shows us that we've got OSPF configured on the individual interfaces and globally we've 15 00:01:19,780 --> 00:01:22,150 got OSPF configured. 16 00:01:22,450 --> 00:01:31,960 So the difference now is we configuring OSPF on individual interfaces and globally configuring OSPF, 17 00:01:32,230 --> 00:01:38,020 but we're not using the network command show IP protocols. 18 00:01:39,180 --> 00:01:40,950 Notice the difference in output. 19 00:01:42,180 --> 00:01:44,790 When compared to rather to. 20 00:01:45,150 --> 00:01:47,460 So I'd rather to show IP protocols. 21 00:01:48,140 --> 00:01:51,170 That's a very different to what we see over here. 22 00:01:51,620 --> 00:01:55,490 Now, packet tracer doesn't show the output correctly. 23 00:01:55,730 --> 00:01:58,850 A real router will show it slightly differently to this. 24 00:01:59,450 --> 00:02:06,950 So if you don't see anything here in the exam, just confirm that the interfaces are configured in OSPF 25 00:02:06,950 --> 00:02:10,100 by using the show ip ospf interface command. 26 00:02:10,280 --> 00:02:16,670 So this interface gigabit is zero zero is configured in OSPF. 27 00:02:16,700 --> 00:02:19,190 So is this interface gigabit zero one. 28 00:02:20,620 --> 00:02:22,380 And so is the loopback. 29 00:02:22,390 --> 00:02:31,210 So we've got all three interfaces configured in OSPF and we should see OSPF neighbor relationships. 30 00:02:31,510 --> 00:02:37,810 So on router three, we see a neighbor relationship to router to make this bigger notice. 31 00:02:37,810 --> 00:02:46,480 The interface used is gigabit zero one on router to show IP OSPF neighbor we've got two neighbor relationships, 32 00:02:46,630 --> 00:02:50,110 one to route one and one to router three. 33 00:02:50,850 --> 00:02:55,800 Reporter one is the designated reporter on the segment. 34 00:02:56,190 --> 00:03:01,950 Reporter three Is the backup designated writer on the segment. 35 00:03:02,730 --> 00:03:10,050 So on router three, we can see that writer two is the designated writer on the segment. 36 00:03:10,470 --> 00:03:15,480 I'll talk about designated writers and backup designated writers in a separate video. 37 00:03:16,140 --> 00:03:20,820 Show IP route shows us that we've learnt a route through OSPF. 38 00:03:21,240 --> 00:03:23,130 There's the loopback of writer one. 39 00:03:23,340 --> 00:03:25,710 Here's the loopback of router two. 40 00:03:26,490 --> 00:03:29,280 Here's Network ten 110. 41 00:03:29,670 --> 00:03:30,660 Over here. 42 00:03:31,720 --> 00:03:32,720 So that looks good. 43 00:03:32,740 --> 00:03:34,690 Can we ping rather one? 44 00:03:34,720 --> 00:03:35,720 Yes, we can. 45 00:03:35,740 --> 00:03:38,080 Can we ping the loopback of router two? 46 00:03:38,110 --> 00:03:39,100 Yes, we can. 47 00:03:39,130 --> 00:03:41,110 Can we ping ten 111? 48 00:03:41,140 --> 00:03:42,160 Yes, we can. 49 00:03:42,880 --> 00:03:44,140 So that looks great. 50 00:03:44,170 --> 00:03:50,710 Again, the configuration here is different to what we did on previous routers. 51 00:03:51,220 --> 00:03:58,060 On previous routers, we didn't configure OSPF on the interface, but we did do that here. 52 00:03:58,090 --> 00:04:03,430 We used a network commands on other routers on this router. 53 00:04:03,760 --> 00:04:05,890 There are no network commands. 54 00:04:06,900 --> 00:04:07,170 Okay. 55 00:04:07,170 --> 00:04:08,430 So that looks great. 56 00:04:08,460 --> 00:04:10,650 Now we need to configure router for.