1 00:00:14,350 --> 00:00:18,650 This is one of multiple videos discussing static routing. 2 00:00:18,940 --> 00:00:27,330 I've received a number of questions along the lines of multiple default routes supported on Narada in 3 00:00:27,340 --> 00:00:33,520 this apology we have four routers and we are concentrating on Rodda one which has three paths to get 4 00:00:33,550 --> 00:00:39,130 to the loop back over to 5 to get to 2 5.5 to 5.5. 5 00:00:39,220 --> 00:00:45,210 One can go via Rodda 2 or via a rotisserie or via a full 6 00:00:48,040 --> 00:00:55,770 so have a look at this writing table and tell me which way will Rodda one send traffic to the Luebeck 7 00:00:55,970 --> 00:00:59,870 of route of 5. 8 00:00:59,960 --> 00:01:01,820 So let's do a trace. 9 00:01:01,820 --> 00:01:09,230 What you'll notice is that the pings fail and they fail because the gateway of last resort is not configured 10 00:01:09,950 --> 00:01:16,180 and there's no specific Raat to 5.5 at 5 5. 11 00:01:16,290 --> 00:01:24,000 If we use the command debug IP packet we'll be able to see what happens when one pings wrote a five 12 00:01:24,450 --> 00:01:26,910 I'll send a single ping in this example. 13 00:01:27,030 --> 00:01:31,450 And what you'll notice is we told that the packet is unreadable. 14 00:01:31,560 --> 00:01:34,200 The router doesn't know where to forward the packet. 15 00:01:34,320 --> 00:01:36,440 So it simply drops it. 16 00:01:37,020 --> 00:01:46,390 If we want to send traffic to of 5 we need to configure a static ROFFT or configure a routing protocol. 17 00:01:46,530 --> 00:01:56,030 This option is called a default route so we can configure a default route pointing to either a local 18 00:01:56,030 --> 00:02:00,170 interface or to the next hop IP address. 19 00:02:00,200 --> 00:02:08,600 So this option ABC forwarding routers IP address allows us to specify the next hop IP address and we 20 00:02:08,600 --> 00:02:13,720 can also specify a administer of distance for the route. 21 00:02:13,820 --> 00:02:15,110 I'm not going to do that here. 22 00:02:15,140 --> 00:02:18,090 I'm going to press a carriage return. 23 00:02:18,170 --> 00:02:22,490 What this has done is set a default route to route a. 24 00:02:22,730 --> 00:02:32,340 So show IP Raat now shows that we have a gateway of last resort configured of tamed wondered or too 25 00:02:33,020 --> 00:02:42,770 to the default network we can see a static ROFFT So notice the stall asterisk denoting candidate to 26 00:02:42,780 --> 00:02:50,730 default prompt the Rodda has a default route via tendered wonder wonder to notice the administer of 27 00:02:50,730 --> 00:02:58,440 distance of the rodders one the administer of distance or believability of a static route to a next 28 00:02:58,440 --> 00:03:00,350 hop IP address is one. 29 00:03:00,780 --> 00:03:07,980 So that's a lot lower than a writing protocol such as I was P.F. or up as an example has an admin distance 30 00:03:07,980 --> 00:03:14,550 of 120 if you can figure out a static route to the local outgoing interface it would have and it must 31 00:03:14,550 --> 00:03:16,850 of dozens of Zerah. 32 00:03:16,910 --> 00:03:24,660 So now when we paying quadruple five the ping works all turn off that debug and do that again. 33 00:03:24,710 --> 00:03:33,410 So Ping succeeds and if we trace to the loopback it's going via router to 10 1 1 2 and that's because 34 00:03:33,410 --> 00:03:38,180 once again the default route is pointing to router 2. 35 00:03:39,130 --> 00:03:42,120 So can we configure another default route. 36 00:03:42,520 --> 00:03:48,730 So as an example can we configure it to go via router 3 10 1 to 2. 37 00:03:49,400 --> 00:03:51,150 And the answer is yes we can. 38 00:03:51,440 --> 00:03:54,890 If we configure it to default the gateways. 39 00:03:55,100 --> 00:04:02,100 Notice how it shows in the running table we can paying wrote a 5. 40 00:04:02,230 --> 00:04:08,580 And when we trace to ratify if the route is going to load balance across those two paths. 41 00:04:08,870 --> 00:04:16,040 So it's going to load balance with one packet going to 10 1 to 2 and one packet going to 10 1 1 2 and 42 00:04:16,040 --> 00:04:19,250 we can see that in the output here. 43 00:04:19,400 --> 00:04:25,100 Notice the traces are load balanced across rodded 2 and router 3. 44 00:04:25,430 --> 00:04:31,170 And then we see Rodda 5 as the next top depending on which path that traffic took. 45 00:04:31,370 --> 00:04:36,740 So that either goes via the top link or the second link. 46 00:04:37,100 --> 00:04:48,420 So show I P-ROC shows us that again we could add a third route via Rodda for a show IP route notice 47 00:04:48,420 --> 00:04:56,070 we have three entries in the writing table and if we trace to 5.5 to 5.5 traffic is load balanced across 48 00:04:56,190 --> 00:04:59,640 those three static rounds. 49 00:04:59,670 --> 00:05:03,930 So in answer to the question can you have a multiple default routes. 50 00:05:03,930 --> 00:05:05,820 The answer is yes you can. 51 00:05:05,820 --> 00:05:09,890 The ratable load balance across those parts equally. 52 00:05:09,990 --> 00:05:12,730 Now you can change the ministry of distance. 53 00:05:12,950 --> 00:05:20,640 So at the moment if I top do show run piping clewed route will see the three static routes in the running 54 00:05:20,640 --> 00:05:29,840 config of the router and what we could do as an example is remove the Roths from the writing table 55 00:05:33,350 --> 00:05:37,880 and add them back with different admen distances. 56 00:05:37,910 --> 00:05:44,170 So previously the administer of distance was one but we cannot change that before we change it. 57 00:05:44,180 --> 00:05:51,120 Notice to show IP Raat shows us that we no longer have any routes to route a 5. 58 00:05:51,170 --> 00:05:57,980 And if we are paying that back to look back the pings are failing because theres no rot in the rotting 59 00:05:57,980 --> 00:06:00,070 table. 60 00:06:00,650 --> 00:06:07,360 Enjoy this video if it was of benefit to you please like it and please subscribe to my YouTube channel. 61 00:06:07,490 --> 00:06:09,650 I wish you all the very best.