1 00:00:01,380 --> 00:00:09,380 On to show Id always be a neighbor noticed the neighbor relationship it's changed to use the loopback 2 00:00:09,380 --> 00:00:18,030 address of quadrupole one so unable or is given route three to ensure full connectivity between all 3 00:00:18,030 --> 00:00:18,720 subnets 4 00:00:21,640 --> 00:00:26,920 show IP interface brief will allow me to see the interfaces configured on those Rodda and you can see 5 00:00:26,920 --> 00:00:28,310 Foster Ethan at zero. 6 00:00:28,420 --> 00:00:33,910 And the two serial interfaces serial once in Sarah and Syria once that one have IP addresses enabled 7 00:00:33,940 --> 00:00:40,230 on them and the interfaces are up lets configure the loop for the Shradha interface Luebeck zero. 8 00:00:41,310 --> 00:00:52,870 IP address may just make it of three topping the come on show IP protocols will allow me to see that 9 00:00:52,870 --> 00:00:55,100 there are no protocols enabled in Misrata. 10 00:00:55,330 --> 00:01:02,560 Once again show IP protocols displays no output as no routing protocols I enabled going into global 11 00:01:02,560 --> 00:01:13,100 config mode Rodda OSPF and I could use Prozess ID three in this case I'm using different process IDs 12 00:01:13,550 --> 00:01:19,850 just to prove the point that the process IDs a local to the router and do not have to be the same across 13 00:01:19,850 --> 00:01:26,400 all routers in the real world it would make more sense to use the same process number on all of UROD 14 00:01:26,410 --> 00:01:28,080 is if possible. 15 00:01:28,400 --> 00:01:39,600 In other words standardize on a process id in this case I could tap a common network of 1.0 3.0 and 16 00:01:39,600 --> 00:01:44,530 put in the wildcard MOS as follows. 17 00:01:44,540 --> 00:01:50,330 In other words use the exact inverse of the network mosque. 18 00:01:50,450 --> 00:01:55,910 And as you can see here a neighbor relationship was established between Route 3 and rockety. 19 00:01:56,210 --> 00:02:04,400 I could use the command to show the OSPF neighbors to see that that neighbor relationship has established 20 00:02:05,330 --> 00:02:16,560 I could then enable OSPF on serial 1 slash 1 so Network 10 on Wonder 5.0 with the wildcard mossed putting 21 00:02:16,560 --> 00:02:22,540 it into areas Zira and now neighbor relationship has been established with Route 1. 22 00:02:22,710 --> 00:02:30,330 So do show IP OSPF Naylor's shows me that on Route 3 I have 2 neighbor relationships with router 1 and 23 00:02:30,330 --> 00:02:39,910 with router t topping that come on network 10 1 4 0 will enable OSPF on the fust. 24 00:02:39,910 --> 00:02:42,090 Ethan 00 interface. 25 00:02:42,280 --> 00:02:50,340 So now typing the command do show the OSPF interface allows me to see that OSPF is enabled on the first 26 00:02:50,360 --> 00:03:00,100 Ethernet 00 interface the serial one slash wanting to base 0 1 selection Zira interface but not on the 27 00:03:00,100 --> 00:03:01,850 loopback interface. 28 00:03:02,080 --> 00:03:10,520 Even though OSPF is not enabled in the loopback interface the Rodda ID is set to the loopback IP address. 29 00:03:10,570 --> 00:03:20,850 The last thing I should do this network are three exact match areas Zerah not topping that come on do 30 00:03:20,860 --> 00:03:22,730 show B if interface 31 00:03:25,900 --> 00:03:30,970 allows me to see that OSPF is enabled in the loopback interface. 32 00:03:31,130 --> 00:03:39,860 Going back to privilege mode I can topic them on show IP OSPF neighbor to see my neighbors and once 33 00:03:39,860 --> 00:03:45,840 again you can see Rotto one and rodded it but I could also do this C'mon show off the OSPF neighbor 34 00:03:46,250 --> 00:03:48,550 and specify an individual neighbor. 35 00:03:48,920 --> 00:03:52,370 And this allows me to see more detailed information about the neighbor. 36 00:03:52,790 --> 00:03:59,840 You can see that the neighbor with Rodda ID quadruple one and interface address 10 1 5 1 is connected 37 00:03:59,850 --> 00:04:04,010 by a serial one slash one and the neighbor relationship is full. 38 00:04:04,010 --> 00:04:07,490 In other words we are exchanging updates with one another. 39 00:04:08,820 --> 00:04:16,410 Bakra not one you can see that the relationship with router three came up right got that and ON-TOPIC 40 00:04:16,520 --> 00:04:25,550 them on show ID ruffs and I can see that I've learned about network quadruple to network with triple 41 00:04:25,560 --> 00:04:36,440 three as well as a Network 10 1 3 0 and Network 10 1 4 0 noticed this gap means that we doing load balancing 42 00:04:37,650 --> 00:04:40,410 because the costs are the same. 43 00:04:40,410 --> 00:04:46,920 In other words from Route 1 point of v to get to Network 10 1 3 0 we could either use this link which 44 00:04:46,920 --> 00:04:52,850 is 128 kilobits per second or we could use this link which is also under twenty eight kilobits per second. 45 00:04:52,980 --> 00:04:56,850 So there are two possible paths to use to get to this network. 46 00:04:57,090 --> 00:05:07,130 OSPF supports equal cost load balancing hopping that come on show IP OSPF database allows me to view 47 00:05:07,130 --> 00:05:09,610 the OSPF quality database. 48 00:05:09,860 --> 00:05:18,140 And as you can see here for always be a router with ID quadruple one process id one area zero. 49 00:05:18,530 --> 00:05:22,320 We have learnt about three routers ourselves. 50 00:05:22,610 --> 00:05:25,440 Router 2 and router 3. 51 00:05:25,460 --> 00:05:29,870 The number of links on Rotto one is 66. 52 00:05:29,870 --> 00:05:38,780 The reason for that is a serial link as a link count of two Router one has two serial links 0 1 0 0 53 00:05:39,260 --> 00:05:41,240 and serial 1 7 1. 54 00:05:41,240 --> 00:05:43,880 In other words two plus two equals four. 55 00:05:43,910 --> 00:05:51,350 Route 1 also has a loop like interface plus one equals five and it has a fast Ethan and zero zero interface 56 00:05:51,610 --> 00:05:54,250 so plus one equals six. 57 00:05:54,320 --> 00:05:56,060 I can see that in more detail by tapping. 58 00:05:56,060 --> 00:05:58,680 C'mon show Id always be a database. 59 00:05:58,880 --> 00:06:05,270 I noticed this option Rodda and then specifying the Rodda ID in this case ourselves. 60 00:06:05,660 --> 00:06:14,080 And you can see once again that in area zero Rato with Russia ID quadruple one has a stub network which 61 00:06:14,080 --> 00:06:17,900 is a loop back interface with an IP address of quadruple one. 62 00:06:17,920 --> 00:06:25,420 And Moscow says that he as well as a point to point link connected to neighboring Rodek quadruple three 63 00:06:26,210 --> 00:06:29,220 with a local IP address 10 1 5 1. 64 00:06:29,230 --> 00:06:32,050 In other words this serial point to point link 65 00:06:35,700 --> 00:06:41,030 as well as Network 10 1 5 0 slashed 24. 66 00:06:41,040 --> 00:06:50,470 In other words the network on the serial link its also connected to Rodda quadrupled to with local IP 67 00:06:50,470 --> 00:06:52,720 address 10 1 to 1. 68 00:06:52,720 --> 00:06:59,530 In other words this interface and on that interface we have Network 10 1 2 0. 69 00:07:00,100 --> 00:07:18,420 We are also connected to Network 10 1 1 0 if you count those networks we have 1 2 3 4 5 6 networks connected 70 00:07:18,420 --> 00:07:26,140 to Rotto 1 notice on serial links there are two entries the entry connected to the neighboring router. 71 00:07:26,480 --> 00:07:32,920 On the point to point link as well as the actual subnet on that point to point link. 72 00:07:32,940 --> 00:07:41,280 So once again show Id always the database shows me that for a local router we have 6 as the link count 73 00:07:41,760 --> 00:07:45,510 because they are two entries for the serial links. 74 00:07:45,510 --> 00:07:54,950 This is the top alogical database which is shared by all rodders so unrounded te So IP OSPF database 75 00:07:56,250 --> 00:08:01,330 will allow me to see that that router has the same information as router 1. 76 00:08:01,480 --> 00:08:12,460 Its the same database on router 3 so IP OSPF database will Lami to see the exact same database link 77 00:08:12,460 --> 00:08:17,610 state routing protocols shared the same database within the network or area. 78 00:08:17,850 --> 00:08:20,370 These three routers on the same area. 79 00:08:20,580 --> 00:08:26,560 So all three of them share the exact same database back and Rotto one I could talk to. 80 00:08:26,560 --> 00:08:28,420 Come on debug. 81 00:08:30,340 --> 00:08:37,010 IP Osugi if events do you see event information on Route 1.