Implementing Cisco IP Routing (642-902 ROUTE) Tutorials
Advanced EIGRP / Lab 3 - EIGRP Bandwidth Control
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Subtitles of the Movie (Implementing Cisco IP Routing (642-902 ROUTE) / Advanced EIGRP / Lab 3 - EIGRP Bandwidth Control)
Alright, we're going to wrap up our EIGRP Lab in this video by going over the final exam objective or the final lab objective. Configure the Central Router to use 25 percent more bandwidth for EIGRP updates than the Default Settings. Now this type of question or this type of objective, really tests two pieces of knowledge. Number one, it tests that you know what the Default Bandwidth for EIGRP updates is and it also tests that you know how to change that EIGRP Bandwidth on a given interface. Unfortunately, the amount of bandwidth for EIGRP updates is just one of those things you have to memorize and it is 50 percent. EIGRP will, by default, use 50 percent of the available configured bandwidth on the interface. Of course the obvious reason for that is so that you'll still have room on your bandwidth pipe for user traffic to go through, even if EIGRP is really busy. And obviously that is a good objective to have. Obviously, if you don't have users using your network, then it's just a bunch of blinky boxes connected with wires but there are some situations where you would need tell EIGRP to use more bandwidth. Now let's take a look at our topology here as an example. Now let's say for the sake of argument that all of these routers are on the same Frame Relay Network. They're not divided in two like they are here in our actual lab and you have one 768k Frame Relay Connection into the Frame Relay Cloud for all four of these sites. Well EIGRP will use 50 percent of the 768k available bandwidth or 384k for all four sites or for updates to all four sites. And as you can see that can cause some route convergence problems especially if you have a big EIGRP event, say a router goes down or a link goes down and you've got all these EIGRP packets flying all across the network and they all have to come through central because it is the, the hub of spoke and hub configuration. So let's go in and change the amount of Bandwidth on the Central Router for both of these Frame Relay interfaces actually. Now we want to use 25 percent more bandwidth for EIGRP updates so if we have 50 percent by default then we want to tell EIGRP to use 75 percent of it's available bandwidth or up to 75 percent of it's available bandwidth for EIGRP updates on our network. So if we go here to Central, the first thing I'll always do, is do a Show IP Interface Brief and let's us know what interfaces are actually being used. In this case, we're using serial 0 slash 0 and serial zero slash 2.9. So now we go onto both of those interfaces and tell EIGRP to use 75 percent of the bandwidth, so go into Config Mode, do interface serial 0 / 0 and in this case we'll use the command IP we'll hit Question Mark, the command we're looking for is right there, bandwidth percent, so we'll do IP bandwidth percent EIGRP since that's the only routing protocol we've got running. The Autonomous System number which is AS 90 and the maximum bandwidth percentage the EIGRP may use. In this case, we're going to tell it 75 although you can go all the way up to you know a million percent if you want, although, although I've never ever seen a network, never ever really seen a need to use a million percent of the available bandwidth. I mean, why not just set it up to three or 400 percent, that would make sure you'd use as much as you need, but no, I guess if you're going to go big or home, then you can set it for a million. So in this case, we'll do that. IP bandwidth percent EIGRP 90 75. Now we used IP but you can also have different EIGRP percentages for IPX or Apple Talk or X25 or any of the protocols. If you hit Question Mark here you'll see some of the other commands in here if they're compiled into this particular version of the IOS and, and they're not, I, I thought they would be, but they're not here. But if you have IPX on a router, you can say IP, you'll only be able to use 25 percent, IPX can use 300 percent, because maybe you have a big IPX, a big Novel network. So now we've done it on that interface so we'll go into interface serial 0 slash 2.9 and we'll do IP bandwidth percent EIGRP 90 75. And that's it, we've accomplished the last objective here. So now let's crack and scramble our network. Now remember we talked about setting Manual Neighbor Statements and if you set one neighbor to manual then you have to set all the neighbors to manual. So let's go on our Central Router and let's say that we want to set up a Manual EIGRP Neighbor for this .2 even though it's discovered via broadcast. We say we have another router out here that can't be discovered via broadcast and we're going to set it up as manual. And we're just going to go in here in the middle of the day; okay well we're going to set up a Manual EIGRP Neighbor for 192.168.22.2. So we go here into the Central Router, Config T, Router EIGRP 90. We'll hit Question Mark just to make sure that the Neighbor Command is available to us and there's neighbor. So there's specify Neighbor Router so we'll do neighbor, neighbor address 192.168.22. We also have to specify the interface, in this case it's serial 0 slash 0 and we hit Enter. So now that we've gotten that Manual Neighbor Statement in there, you'll notice that our neighbors on that interface are down because we've configured a static peer. So now we have a peer with the North or we will here in a second but we will not have a peer with the East because EIGRP no longer sends Multicast packets on this serial 0 slash 0 interface and again if this is the middle of the day, you've just split your network in half and that's, that's kind of bad thing. So this shows you what happens when you enter a Manual Neighbor Statement. In this case we will just do No Neighbor 192.168.22.2, serial 00 and in a little bit, our adjacencies will come back up and that's it. We've completed all the objectives for our lab that concludes our discussion of our EIGRP Lab 3.
Tutorial Information
| Course: | Implementing Cisco IP Routing (642-902 ROUTE) |
| Author: | Greg Dickinson |
| SKU: | 34291 |
| ISBN: | 978-1-61866-028-2 |
| Release Date: | 2011-12-28 |
| Duration: | 10 hrs / 105 lessons |
| Work Files: |
Yes |
| Captions: | No |
| Compatibility: |
Vista/XP/2000, OS X, Linux QuickTime 7, Flash 8 |
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