1 00:00:04,240 --> 00:00:04,770 You know 2 00:00:15,330 --> 00:00:22,580 in this blog we are going to continue our discussion about administering distances. 3 00:00:22,600 --> 00:00:24,710 So let's start with some questions. 4 00:00:24,880 --> 00:00:28,590 When Radu one pings the loop back. 5 00:00:28,710 --> 00:00:34,810 So $4.4 4.4 which way will the traffic go. 6 00:00:35,200 --> 00:00:36,040 Show i.p. 7 00:00:36,090 --> 00:00:37,580 Shows us the writing table. 8 00:00:37,680 --> 00:00:43,960 So you answer the question Which way will traffic go when sent from a one to 4. 9 00:00:44,210 --> 00:00:45,810 Will it go viral too. 10 00:00:45,890 --> 00:00:48,390 Or will it go by a router 3. 11 00:00:48,390 --> 00:00:52,350 Which way will it go and why. 12 00:00:52,380 --> 00:00:55,710 So let's do a trace to triple four. 13 00:00:56,220 --> 00:00:59,700 So the traffic is going via router too. 14 00:00:59,880 --> 00:01:06,170 So the next top is tendered one to one to two and then it goes to tender one two or three day or two. 15 00:01:06,250 --> 00:01:07,830 Why. 16 00:01:08,060 --> 00:01:14,750 So he has the writing table we've got these entries for network $4.4 4.4. 17 00:01:15,040 --> 00:01:20,470 Both a GOP and OSPF ront are shown on the writing table. 18 00:01:20,470 --> 00:01:28,120 Notice the Edmon distance of your GOP and OSPF your GOP has a lower administrative distance than OSPF 19 00:01:28,120 --> 00:01:28,750 does. 20 00:01:28,960 --> 00:01:34,500 So typically your job is more believable than OSPF. 21 00:01:34,510 --> 00:01:38,460 See my other videos for examples demonstrating that. 22 00:01:38,680 --> 00:01:41,790 However and this is the important piece. 23 00:01:41,800 --> 00:01:49,750 Notice the mosque used on the GOP route compared to the mosque used on the OSPF route from Iran his 24 00:01:49,750 --> 00:01:50,320 point of view. 25 00:01:50,320 --> 00:01:52,950 These are two separate networks. 26 00:01:53,020 --> 00:02:00,970 We've got a $4.4 4.0 network and we've got a Ford Ford at 4.4 slash 32 network. 27 00:02:00,970 --> 00:02:04,040 So slushed 24 and slash 32 network. 28 00:02:04,330 --> 00:02:06,580 They are separate networks. 29 00:02:06,580 --> 00:02:10,110 The Rodda will choose the route with the best match. 30 00:02:10,120 --> 00:02:16,390 In other words the longest match 32 bits is a longer match or better match than 24 bits. 31 00:02:16,420 --> 00:02:25,740 So this route takes precedence over this route for traffic sent to the loop back of rota for the administer 32 00:02:25,740 --> 00:02:30,860 of distances are only used when we are talking about the same route. 33 00:02:30,870 --> 00:02:35,330 In other words the mosques are the same here because they are different mosques. 34 00:02:35,340 --> 00:02:44,760 Longest match is used as an example if I removed from the router and then use the command show IP route. 35 00:02:45,090 --> 00:02:51,750 Notice the GOP route is the route in the writing table and if we traced to quadruple for it would go 36 00:02:51,750 --> 00:02:54,390 via router three. 37 00:02:54,490 --> 00:03:06,660 So lets add back who is P.F. and I'll just enable OSPF on all interfaces and areas zero show IP ROFFT 38 00:03:08,080 --> 00:03:16,400 SPF loading school has to be done but once that's done I noticed the rapture is available in the writing 39 00:03:16,400 --> 00:03:19,890 table and we are going via. 40 00:03:20,020 --> 00:03:28,670 In this example Serrato one is learning about this network from ratatouille through SPF wrote of one 41 00:03:28,670 --> 00:03:32,190 is learning about this network through your job. 42 00:03:32,450 --> 00:03:33,660 From Rodda 3. 43 00:03:33,860 --> 00:03:43,550 But because of the longest match the traffic is sent via Rodda to. 44 00:03:43,760 --> 00:03:48,860 So let's see why the summary ROFFT was adage so show running to face gigabit. 45 00:03:48,860 --> 00:03:54,000 0 1 I added this summary route to route of 4. 46 00:03:54,260 --> 00:04:02,720 To summarize the network advertised through your GOP Let's go to that interface and remove it. 47 00:04:07,860 --> 00:04:16,390 Now show IP brought on Rato one what you'll notice is the OSPF rot has been removed. 48 00:04:16,620 --> 00:04:21,940 The new route has only been available in the writing table for 5 seconds. 49 00:04:21,950 --> 00:04:28,570 Previously we had this rumped in the writing table for about forty nine seconds. 50 00:04:28,760 --> 00:04:36,200 So a new route has been added to through the GOP because it's the same route as the ROFFT advertised 51 00:04:36,200 --> 00:04:37,590 by OSPF. 52 00:04:37,610 --> 00:04:43,850 In other words this is the same as this exact match. 53 00:04:43,850 --> 00:04:49,730 The GOP rot takes precedence because it has a lower administer of distance. 54 00:04:50,000 --> 00:04:55,110 So now when we trace to that loopback it's going via rodded three. 55 00:04:55,190 --> 00:05:02,420 So be careful with Edmon distances in the ministry of distance is only used as a tiebreaker when multiple 56 00:05:02,420 --> 00:05:06,400 routing protocols are trying to put the same route into the writing table. 57 00:05:06,500 --> 00:05:10,940 If they are different Roths in other words they different mosques both routes will end up in the running 58 00:05:10,940 --> 00:05:11,590 table. 59 00:05:11,960 --> 00:05:18,020 That completes this Flug if you enjoyed the video please like it and please subscribe to our YouTube 60 00:05:18,020 --> 00:05:19,070 channel. 61 00:05:19,070 --> 00:05:20,530 I wish you all the very best.