Time
23 hours 18 minutes
Difficulty
Beginner
CEU/CPE
14

Video Transcription

00:00
Hello and welcome back to I C D. One interconnecting Cisco networking devices apart. One that sets of 5 to 2 routing protocol concepts I'm dreading dear, one of your strict for this course in the last video one or the lesson at five points you over, you handsome pre assessment questions
00:15
in this episode of recovering the routing protocol features, we're going to get the distance vector protocols and take a look at V two. Lastly,
00:24
we're learning objectives for this. We're gonna get the routing protocol features. We're gonna look at interior Gateway protocols. We're gonna look at distance factoring or devi split horizon and route poisoning. And then we will look at specifically Roe v two
00:40
and hope you guys remember which of these roading prickles used to be. A Cisco proprietary protocol giving a few seconds
00:51
for it. Is he I g R p.
00:55
All right, so the running protocol features what you want from a routing protocol. You wanted to go to learn that sub net routing information from his neighbors.
01:03
If it can't learn routes, it's not a very good routing protocol.
01:07
Um, and you also want to be able to advertise it sub net routing information to his neighbors. So you wanted to learn and to send it the same time.
01:17
Um And then, out of all this information, you wanted to choose the best route based on some sort of a metric or administrative distance that you're using two different protocols or percent of static routes.
01:29
Um,
01:30
but you know, you want these different metrics. Let's say we'll show you a little bit ones, you know, a couple hops away and one's on one hop. You wanted to choose that Better row, depending on the metric
01:42
and age protocol has its own metric.
01:45
That's why we have administrated. This is because you can't compare the metrics. But you also wanted to react to changes in networks apology. So if you lose a link between ah, a few of the routers to one subject, but you still have a route all the way around the
02:00
networks that are suddenly you wanted to be able to figure it out that that link is down and use a different route to get over to It
02:07
s o. You have a couple that routing protocol groups. I guess you come. So you have a GP or the interior Gately protocol. So think of the ones that route between land. So think of like
02:19
the company is gonna set up thes GPS between their difference
02:23
networks between the different sub nights and then maybe some outbuildings.
02:29
Think of E g p as in the Internet. The actually IGP is the road and protocols of the Internet. But
02:35
yes, there's a running protocol called exterior Gateway protocol and then IGP extra gateway protocol also is that group is
02:44
kind of crazy, but B g p also falls into that.
02:47
Um so think, think the large scale think the routing of the Internet
02:52
think much larger we're gonna be doing with my GP, so don't worry.
02:59
So I g p s s o e i g a p the enhanced interrogation programme routing critical. He replaced by GOP. This was a Cisco proprietary protocol, and they opened up in 2013 for public use as a informational RFC.
03:14
Next, we have the O S P. F, which is the open shortest path. First sets are C 23 28 lastly, what we're gonna be doing within I see anyone is ripped V to the routing information protocol very simple.
03:27
So a bit into the distance vector logic here and ready to sow reviews is the distance vector logic for its metric algorithm.
03:38
By that means you think of distance and vectors, right? Distance is how far away something is and vector is in. What direction is this?
03:46
Endpoint.
03:49
So is it on this interface at how many hops
03:53
so think of it? I always refer to hops. Hop counts is
03:58
think of each runner as a hop. Right. Um,
04:00
but hot count is this metric,
04:03
so yeah, um,
04:06
so rip the way it works as well is it's just gonna always send that full update on a periodic timer.
04:14
Um, even if nothing has changed, it's just going to send that,
04:16
um,
04:18
update on a longer time. The problem with the using a hot count as a metric
04:24
is just this. So I'm gonna go ahead and get the pan out here, Ships three.
04:29
All right, So think of this year, I'll say, this is a fast Ethernet,
04:34
so running at 100 megabits, this is fast.
04:39
And these were all you know, gig lines here. One gigabit
04:44
one g b.
04:46
So one,
04:48
23 it's gonna take three hops to get over this sub net going this way,
04:55
we could take one
04:57
to to get over on this route.
04:59
So with rip, me too. It's going this way.
05:02
It will put this one in here as a,
05:05
uh is an option if this one ever was down.
05:09
But it would be faster over the gig lines, but with using a hot counter that metric, that's what you run into
05:15
is going to use those shorter
05:17
hop counts
05:18
we're gonna split her risings are split arising. What it does is omits routes from the routing update that its scent.
05:27
So what I mean by that is it looks at the routing update.
05:30
And
05:32
let's say it says okay, have these rounding up dates and
05:36
you know,
05:39
the network centre on fast. Even 0 24 already know about the network Said around fast. Ethan is there 24. I don't need to waste the routing update,
05:48
uh, network to go ahead and send that out. I will avoid that. I'll just send up the stuff that they shouldn't know about.
05:57
Um,
06:00
so it's a simple is that it just looks at it and says, these interfaces you should know about this
06:04
route because it's on that interface.
06:08
So I'm not gonna waste the time sending out that wrote information through there
06:12
route poisoning. What that does is it's avoiding loose by advertising a failed link with the Metro affinity
06:18
and
06:20
bye that's it.
06:23
Think of. If you have the square network again, we'll go back to this.
06:27
If we have the square network and
06:30
we want to avoid the loops, right,
06:32
let's just say it's gonna advertise this one as being down by giving it a metric of 16 or 16 hops.
06:40
So that way, everything knows it needs to go this way
06:43
instead of trying to go that way.
06:45
It's a simple as a
06:46
so everyone was Rippy to. So both of them have a max
06:50
account or metric of 15.
06:54
They both sent full routing updates with split horizon,
06:58
and then it's both they're gonna use that 16 of the metric it was gonna poison that route.
07:02
Um,
07:03
but really, to the cool thing about it is
07:08
it's it's clad like it's classless network. Rippy one was class full, meaning this 10 dot network that we're using as our lab
07:15
wouldn't work in Rippey one it would all technically be on the same class full network, that 10.0 slash eight.
07:24
It would all be on that same network, really to allows for Viola Cem so weakens. Throw in the slash 30 the slash 20 fours on the 10 dot network, whereas couldn't review wanted.
07:38
We can add in manual route summaries ation if we want to, as well. That is saying that
07:45
Let's see the left half. The network is on
07:47
different subjects of 10 dots, whereas the right half is
07:51
different sub nets of 172.16. We can say,
07:57
Okay, we have no 1 76 teens on the left. So anything we'll just say we'll just throw everything for 1 70 that 16 off to the right and we'll just send it all there.
08:05
Um,
08:07
that's what it does. It just simplifies your running updates.
08:11
Um, then what it does is it sends that routing update to the multi cast address of 2 24.0 dot nine.
08:20
That would be good. Wanna know if you're curious
08:22
and also allows for authentication between routing that way? Some malicious actor couldn't get under network and start sending rounding updates, say in haste and all your traffic through me
08:33
toe where they could start sniffing the network, grabbing passwords and doing all the rest of stuff.
08:39
So is getting to recap here. We looked at the routing protocol features we looked at. You know, we wanted to get updates. We wanted to send up days. We want to choose the best links
08:48
we wanted to react of failures. We looked at the two or the couple different interior gateway protocols being yeah, GOP, this Cisco probably Terry one.
08:56
We looked at oh SPF briefly, and we looked finally at privy to and really wanna differences.
09:03
And I talked a little bit about how a distance factoring works, the split horizon and rat poisoning.
09:09
So we'll move on to the post assessment here. What is the metric that rippy to uses?
09:16
I'll give you a few seconds. Here
09:20
it is the hot account
09:24
you'll get into bandwith
09:26
with the European Ressam.
09:28
There are a lot more complex in hot counts. But worry about Ripley too. For now,
09:35
the next one, we're gonna go ahead and configure it. Be to our routers and you'll see why routing protocols is preferable to sending static routes for everything in your network.
09:45
And as always, if you guys have questions, need help. Feel free to shoot me. Message. Otherwise, thank you for watching this lesson. Look forward to seeing the rest up.

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