1 00:00:08,860 --> 00:00:12,230 This is one of multiple SPF videos. 2 00:00:12,400 --> 00:00:19,380 I was asked to explain Oh SPF multiple areas and this is one of multiple videos helping explain how 3 00:00:19,450 --> 00:00:28,940 SPF works when you have multiple areas configured router 5 is another area border router it exists between 4 00:00:29,090 --> 00:00:32,480 area zero and Area 2. 5 00:00:33,110 --> 00:00:35,630 So bypass the initial configuration dialog 6 00:00:38,230 --> 00:00:42,070 and configure this of four out of five interface gigabit. 7 00:00:42,080 --> 00:00:50,100 Zero zero and no shut IP address 10 1 4 2 slash 24 mosque 8 00:00:53,760 --> 00:01:04,450 so that was the IP address configured on gigabit 0 0 on interface gigabit 0 1 IP address 10 1 5 1 24 9 00:01:04,460 --> 00:01:08,960 mosque and I'll create a loop back of Triple Five 10 00:01:12,200 --> 00:01:22,630 so do show IP interface brief IP addresses are configured on the various interfaces I forgot to no shut 11 00:01:23,160 --> 00:01:23,590 gigabit. 12 00:01:23,600 --> 00:01:28,220 There 1 so there we go on this Friday we are going to configure always P.F.. 13 00:01:28,270 --> 00:01:34,480 But what we're going to do now is make sure that we configure and I'll do it slightly differently now. 14 00:01:34,660 --> 00:01:45,520 We'll configure gigabit 00 in area zero so we're saying this interface gigabit 00 which has an IP address 15 00:01:45,520 --> 00:01:53,950 of 10 1 4 2 is going to be put into area zero because of the mosque used here. 16 00:01:53,950 --> 00:01:56,110 It's an inverse mosque. 17 00:01:56,110 --> 00:02:03,760 I'll also put the loop back of the router into areas zero and then I'll configure 18 00:02:06,870 --> 00:02:07,380 gigabit. 19 00:02:07,380 --> 00:02:16,170 Is there a 1 in Area 2 so show run section who is P.F.. 20 00:02:16,260 --> 00:02:18,950 That's the configuration of SPF on the. 21 00:02:19,080 --> 00:02:22,860 Show IPO SPF interface brief at the moment. 22 00:02:22,860 --> 00:02:27,370 We only have SPF enabled on one interface. 23 00:02:27,370 --> 00:02:34,940 And that's because I made some mistakes so let's read do that no network for 444 24 00:02:38,270 --> 00:02:39,570 should be network. 25 00:02:39,800 --> 00:02:41,180 5 5 5 5 26 00:02:44,860 --> 00:02:46,720 show IP 0 SPF 27 00:02:49,370 --> 00:03:00,500 interface brief we've got 0 SPF running on the loop back and gigabit 00 so show IP interface brief 10 28 00:03:00,500 --> 00:03:04,650 1 5 1 is configured on gigabit 0 1. 29 00:03:05,060 --> 00:03:10,430 Let's see what I did wrong in 0 SPF I put this as a zero. 30 00:03:11,240 --> 00:03:19,940 Rather than using the right mosque so no network 10 1 5 0. 31 00:03:20,410 --> 00:03:21,830 This should have been done 32 00:03:26,750 --> 00:03:37,140 like this so show IPO SPF interface brief that looks better or SPF is configured on three interfaces. 33 00:03:37,400 --> 00:03:40,180 Show IP round. 34 00:03:40,310 --> 00:03:52,050 We are learning intra area runs into area roots and external rots and root of 5 should be able to ping 35 00:03:52,050 --> 00:03:58,090 router 1 which it can and we can see the output on wrote a 1 OK. 36 00:03:58,100 --> 00:04:01,130 So the lower strata to configure is right 6. 37 00:04:01,160 --> 00:04:09,980 This is an internal router all interfaces on this proto belong to area to sell bypass the initial configuration 38 00:04:09,980 --> 00:04:21,260 dialog and all configured the router should be right a 6 interface gigabit 00 no shut IP address 10 39 00:04:21,260 --> 00:04:22,700 1 5 2 40 00:04:25,820 --> 00:04:34,420 so that's the IP address on gigabit 00 interface loop back 0 IP address quadruple 6 41 00:04:37,550 --> 00:04:48,560 as follows router over SPF 1 network and I'll just do it this way to keep it simple all interfaces. 42 00:04:48,620 --> 00:05:01,240 In this example belong to Area 2 so show IP SPF interface brief show IP SPF interface brief shows us 43 00:05:01,270 --> 00:05:09,580 that 0 SPF is running on both gigabit 00 and the loop back show IPO SPF neighbor shows us our neighbor 44 00:05:09,580 --> 00:05:15,340 relationship to write of 5 show ip route shows us our writing table. 45 00:05:15,430 --> 00:05:22,900 Now here we don't see any intra area runs because this Ethan it interface and the loop back of the local 46 00:05:22,900 --> 00:05:30,880 router are seen as directly connected rather than being advertised by a writing protocol. 47 00:05:30,880 --> 00:05:39,640 So we see in our area ruts and quite a few of them as well as external rods wrote a six should be able 48 00:05:39,640 --> 00:05:49,260 to ping wrote a one which it can and we can see the debugger and write a 1 to show IP or SPF database. 49 00:05:49,270 --> 00:05:57,820 Notice that on Route 6 this command shows us only Area 2 because the rod is only configured in Area 50 00:05:57,820 --> 00:06:06,910 2 it sees that rod a 6 and write a 5 are configured in area to seize that rod of 5 is the designated 51 00:06:06,910 --> 00:06:19,060 Rado on the Ethernet segment in Area 2 it sees a range of LSD these are into area Roth's LSA types 3 52 00:06:19,870 --> 00:06:28,910 it sees a type for LSA which is a summary ISP are LSA and it sees external ruts. 53 00:06:29,020 --> 00:06:39,910 So there you have an example of many LSA types that you get in 0 SPF LSA type 1 Rod LSD LSA type 2 network 54 00:06:40,150 --> 00:06:41,160 link LSD 55 00:06:43,930 --> 00:06:52,180 top 3 summary LSD type 4 EPR LSD and top 5 external LSD. 56 00:06:52,240 --> 00:07:00,640 Let's have a look at Rider 5 which has interfaces in multiple areas so show IPO SPF database you'll 57 00:07:00,640 --> 00:07:11,680 notice it displays information for area 0 as well as for Area 2 so on area 0 we have 3 routers in areas 58 00:07:11,750 --> 00:07:12,520 0. 59 00:07:12,810 --> 00:07:23,790 We have 2 designated routers in area 0 So to net the link states these are summary LSD or rots coming 60 00:07:23,790 --> 00:07:26,190 from other SPF areas. 61 00:07:27,500 --> 00:07:35,930 There is one autonomous system border Radha LSA then we see similar information for Area 2 and right 62 00:07:35,930 --> 00:07:45,170 at the end we see the external LSD or LSA top 5 there was an example of how to configure multi area 63 00:07:45,220 --> 00:07:47,080 o SPF. 64 00:07:47,080 --> 00:07:52,400 Hope you found this video useful if it's been of benefit to you please like it and please subscribe 65 00:07:52,400 --> 00:07:56,000 to my YouTube channel I wish you all the very best.