1 00:00:12,110 --> 00:00:18,560 This is one of multiple videos that help you troubleshoot CCMA scenarios in preparation for the CCMA 2 00:00:18,560 --> 00:00:19,950 exam. 3 00:00:19,970 --> 00:00:28,160 We've been told that P.S. 1 on the left in this topology is unable to ping P.S. 2 in this topology I'm 4 00:00:28,160 --> 00:00:35,550 using genus 3 and Cisco Iowa's v routers as rather one and Robert T. 5 00:00:35,610 --> 00:00:37,950 And to mimic the pieces in the topology 6 00:00:40,830 --> 00:00:49,080 and don't trust a user when they tell you something as Ronald Reagan said Trust but verify we've been 7 00:00:49,080 --> 00:00:55,340 told that P.S. One is not able to ping P.S. 2 and we verified that that's true. 8 00:00:55,350 --> 00:01:01,830 Notice we're getting a U in the output which means that the traffic is being forwarded to a router and 9 00:01:01,830 --> 00:01:11,850 that Rondo doesn't know what to do with a traffic now to ensure that trace route runs quickly. 10 00:01:11,940 --> 00:01:19,710 All disable IP domain lookup and then we'll run a trace right to PCI to notice that traffic is getting 11 00:01:19,710 --> 00:01:23,390 to write a one but is not going any further. 12 00:01:23,640 --> 00:01:31,830 So it looks like there's a problem on road or one en route to one show IP road show ip route shows us 13 00:01:31,860 --> 00:01:38,160 that the only routes in the routing table are directly connected networks and the local IP addresses 14 00:01:38,640 --> 00:01:43,170 on the router because this is a remote network. 15 00:01:43,170 --> 00:01:48,320 We need to run routing protocols on Route 1 and wrote a 2 to exchange runs. 16 00:01:49,020 --> 00:01:56,060 So rather one needs to learn about network 10 1 2 3 0 from router 2. 17 00:01:56,100 --> 00:02:03,280 So on Route 1 show IP protocols are we running a routing protocol. 18 00:02:03,280 --> 00:02:13,090 And the answer is yes we are we're running 0 SPF 0 SPF is enabled in area 0 on gigabit 00 and in aerial 19 00:02:13,090 --> 00:02:15,130 one on gigabit. 20 00:02:15,130 --> 00:02:20,890 0 1 so show IP 0 SPF neighbor. 21 00:02:21,210 --> 00:02:30,890 We don't have any neighbor relationships though show IP or SPF interface brief 0 SPF is enabled on gigabit 22 00:02:30,970 --> 00:02:38,250 0 0 in area 0 and it's enabled on gigabit 0 1 in Area 1. 23 00:02:38,420 --> 00:02:39,930 So rather one looks good. 24 00:02:39,950 --> 00:02:40,620 What about right. 25 00:02:40,640 --> 00:02:51,000 To show IP protocols we are running 0 SPF on wrote a 2 but can you spot the problem. 26 00:02:51,000 --> 00:02:59,790 You should be able to see it in the output of this command to help you show IP SPF interface brief notice 27 00:02:59,810 --> 00:03:07,820 or SPF is not running on any interfaces on Robert 2 Why is that. 28 00:03:07,920 --> 00:03:09,330 Look at this output. 29 00:03:09,450 --> 00:03:20,400 Its routing for networks 10 dot 1 0 0 0 0 0 255. 30 00:03:20,440 --> 00:03:24,940 This means there's an exact match on the first 3 octet. 31 00:03:25,090 --> 00:03:31,510 In other words 0 SPF is only running on Network 10 1 0 0. 32 00:03:31,750 --> 00:03:37,660 Do we have any interfaces in that network show IP interface brief. 33 00:03:37,660 --> 00:03:38,860 No we don't. 34 00:03:38,860 --> 00:03:44,190 We have an IP address configured as follows and one configured as follows. 35 00:03:44,340 --> 00:03:55,540 0 SPF is not running on any interfaces on this rather show run pipe section or SPF that allows us to 36 00:03:55,540 --> 00:04:00,130 view the SPF configuration so SPF has been configured. 37 00:04:00,130 --> 00:04:08,820 But notice the network command has been configured incorrectly so rudder or SPF 1. 38 00:04:09,060 --> 00:04:09,650 No 39 00:04:13,650 --> 00:04:17,740 network 10 1 0 0. 40 00:04:17,760 --> 00:04:25,200 The command should be 10 1 0 0 0 0 255 255. 41 00:04:25,200 --> 00:04:31,540 Now you don't have to do it that way but that's one of the options noticed Suddenly. 42 00:04:31,550 --> 00:04:33,140 A neighbour relationship is established. 43 00:04:33,860 --> 00:04:37,610 Let's have a look at the output against the show IPO SPF interface. 44 00:04:37,820 --> 00:04:40,970 Let's rather do a brief because that's too much output. 45 00:04:40,970 --> 00:04:48,730 Notice Oh SPF has now enabled on both interfaces of Robert to show IP protocols. 46 00:04:48,750 --> 00:04:50,800 This looks a lot better. 47 00:04:50,880 --> 00:04:52,610 Show IP who SPF. 48 00:04:52,620 --> 00:04:53,510 NEIGHBOUR. 49 00:04:53,520 --> 00:04:58,720 NEIGHBOUR relationship is established to write a one show IP round. 50 00:04:59,070 --> 00:05:10,100 We have an entire area right on road a two to Network 10 1 1 0 and on Route 1 show IP 0 SPF neighbor. 51 00:05:10,170 --> 00:05:15,230 We have a neighbour relationship to 10 1 3 1 show IP rot. 52 00:05:15,270 --> 00:05:18,640 We have learnt a rod through a whisper. 53 00:05:18,760 --> 00:05:21,500 Now notice it's not an entire area rot. 54 00:05:21,630 --> 00:05:26,420 The rot is in the writing table but it's showing as an intra area rot. 55 00:05:26,700 --> 00:05:27,830 Whereas this rot. 56 00:05:28,050 --> 00:05:30,860 Is an entire area rot. 57 00:05:30,990 --> 00:05:36,210 Ken P.S. 1 pain P.S. to answer is yes. 58 00:05:36,330 --> 00:05:40,700 So this is a decision that you would need to make based on your design. 59 00:05:41,070 --> 00:05:51,500 Show IP protocols on Route 1 shows us that 0 SPF has 1 interface gigabit 0 0 in areas 0. 60 00:05:51,510 --> 00:05:53,220 That's fine. 61 00:05:53,220 --> 00:06:05,870 This interface is an area one where as on route to we have both interfaces in area zero so the network 62 00:06:05,870 --> 00:06:06,720 works. 63 00:06:06,800 --> 00:06:08,780 But perhaps you want to do it this way. 64 00:06:08,780 --> 00:06:11,770 So Radha who SPF 1. 65 00:06:12,290 --> 00:06:15,050 Network 10 1 2 0. 66 00:06:15,560 --> 00:06:19,610 And do it more explicitly and then network 10 1. 67 00:06:21,200 --> 00:06:23,390 3 0. 68 00:06:23,630 --> 00:06:27,820 I'll show you the output in a moment if you weren't sure about what I was typing. 69 00:06:28,010 --> 00:06:40,580 So show run section of SPF we have to network commands configured this network is an area zero based 70 00:06:40,580 --> 00:06:46,120 on this command and this network is in Area 2. 71 00:06:46,190 --> 00:06:51,680 Based on this command show IP SPF neighbour. 72 00:06:52,100 --> 00:06:53,590 Neighbour relationship is established. 73 00:06:53,630 --> 00:06:59,160 We have an entire area right on Road at 2 and on Route 1. 74 00:06:59,180 --> 00:07:05,260 We now see an entire area Route 10 1 3 0 slash 24. 75 00:07:05,270 --> 00:07:09,300 In other words this network 76 00:07:12,600 --> 00:07:21,630 is in area 0. 77 00:07:21,750 --> 00:07:22,950 This is area 2 78 00:07:26,630 --> 00:07:28,700 and this is area 1 79 00:07:34,440 --> 00:07:39,120 it's important that you update your documentation and make sure that you configure your network correctly 80 00:07:39,120 --> 00:07:45,540 per the documentation so to confirm that show IP protocols. 81 00:07:45,640 --> 00:07:46,720 This is correct. 82 00:07:46,720 --> 00:07:48,530 Its area 0. 83 00:07:48,820 --> 00:07:50,200 This is also correct. 84 00:07:50,290 --> 00:08:01,730 That's area 1 show IP protocols en route to output looks as follows this network 10 1 2 0 is an area 85 00:08:01,730 --> 00:08:05,560 0 and this one is an area 2. 86 00:08:05,570 --> 00:08:12,820 Now the reason why we have a difference in the output is notice the interfaces on Rider 2 don't have 87 00:08:13,150 --> 00:08:15,170 a SPF commands on them. 88 00:08:15,250 --> 00:08:23,410 We enabled 0 SPF in the writing process using the network command where as en route a 1 89 00:08:26,550 --> 00:08:35,380 0 SPF was enabled on the interfaces individually and not under the 0 SPF process. 90 00:08:35,380 --> 00:08:41,310 Both methods work in IP version 4 in IP version 6. 91 00:08:41,340 --> 00:08:48,780 You need to use this method to enable 0 SPF on individual interfaces so that's an example of how to 92 00:08:49,080 --> 00:08:51,500 troubleshoot 0 SPF. 93 00:08:51,540 --> 00:08:53,430 Please comment on the video. 94 00:08:53,430 --> 00:08:55,650 Let me know if it was useful to you. 95 00:08:55,650 --> 00:08:57,180 Please also subscribe. 96 00:08:57,180 --> 00:08:59,320 Thanks for watching and all the very best.