All language subtitles for Free-CCNA-Configuring-EIGRP-Day-25-Lab-CCNA-200-301-Complete-Course_en

This is a free, complete course for the CCNA.

If you like these videos, please subscribe\n

Also, please like and leave a comment, and\n

Also, remember to sign up via the link in\n

for this course, so you can try it out yourself\n

If you want more labs like these, I highly\n

the CCNA, click the link in the video description\n

It’s a network simulator like packet tracer,\n

of these guided labs to not only help you\n

but also deepen your understanding of the\nexam topics.

I used it myself when studying for my certifications,\n

If you want to get your own copy of NetSim,\n

In this video we’ll practice some basic\nEIGRP configurations.

The configuration of EIGRP itself isn’t\n

to introduce some aspects of EIGRP that might\n

path selection, and unequal-cost load-balancing.

My advice is to try to remember the extra\n

worry about remembering all of the EIGRP-specific\ncommands.

Actually, this video will be half lab and\n

So, we’ll have to make sure we configure\n

become EIGRP neighbors, and therefore won’t\n

In this network, the link between R1 and R2\n

connections between routers are FastEthernet.

Step 1 is to configure the appropriate hostnames\n

Instead of pre-configuring everything, I decided\n

To save time in this video I did pre-configure\n

you download you’ll have to configure the\n

So, let’s move straight to step 2.

Configure a loopback interface on each router.

I only briefly mentioned these in the last\n

talk more about them in the OSPF videos coming\n

I’ll hop on R1 and configure its loopback\ninterface.

First let’s check R1’s interfaces.

So, you can see the interfaces which I pre-configured\n

CONF T. INTERFACE, and let’s use the question\nmark.

Here you can see the loopback option, so type\n

Then let’s use the question mark again.

As you can see the numerical range you can\n

I’m not sure what the maximum number of\n

is, but it probably depends on the type of\nrouter.

Anyway, I’ll just make this ‘loopback\n0’.

As soon as you enter the command, you get\n

Now you can configure the IP address just\n

IP ADDRESS 1.1.1.1 255.255.255.255.

It’s common to use a /32 mask for loopback\naddresses.

I won’t talk in depth about loopback interfaces\n

is a virtual interface in the router.

Now let’s check the interfaces here once\nmore.

Now you can see the Loopback0 interface and\n

A loopback interface is always up unless you\n

Now I’ll go through the other routers and\n

As you can see, you can just type ‘L’\n

IP ADDRESS 2.2.2.2 255.255.255.255.

IP ADDRESS 3.3.3.3 255.255.255.255.

IP ADDRESS 4.4.4.4 255.255.255.255.

Next up let’s configure EIGRP on each router.

Since I’m on R4 already, I’ll start here.

You can enter EIGRP configuration mode directly\n

no need to go back to global config mode.

ROUTER EIGRP, and for EIGRP we have to enter\n

This number must match for two routers to\n

In this lab, I’m using an AS number of 100.

From here, let’s enable EIGRP on all interfaces.

Actually, let me show you a little shortcut.

This is not recommended in real networks,\n

interfaces you want to enable EIGRP on.

But you can enable EIGRP on ALL interfaces\n

NETWORK 0.0.0.0 255.255.255.255.

Remember, the NETWORK command uses a wildcard\n

So, ALL IP address are in the 0.0.0.0/0 range,\n

Once again, not recommended in real networks,\n

Next we are instructed to disable auto-summary.

The routers I used in the lecture video had\n

these routers have it enabled by default,\n

Let me show you it’s activated.

It says right here, ‘Automatic network summarization\n

‘Automatic network summarization is not\nin effect.’

Next up we are told to configure passive interfaces\n

So, I said in the lecture video that we should\n

any EIGRP neighbors, a passive interface.

However, it’s a good idea to do it on loopback\ninterfaces also.

Well, the router will treat the loopback interface\n

messages out of it, even though the loopback\n

It’s just a waste of resources on the router,\n

Now GigabitEthernet0/0 and Loopback0 are listed\n

Okay, that’s all of the configuration on\nR4, next I’ll do R3.

Directly from interface config mode, let’s\n

Again, make sure that AS number matches with\nthe other routers.

Here on R3 I’ll be a little more responsible\n

NETWORK 10.0.13.0 0.0.0.3, that’s a /30\n

Don’t forget the loopback interface, we\n

That’s a /32 prefix length written as a\nwildcard mask.

Finally, make Loopback0 a passive interface.

Auto-summary is disabled, these are the network\n

Next up I’ll do basically the same configurations\non R2.

NETWORK 10.0.12.0 0.0.0.3 NETWORK 10.0.24.0\n0.0.0.3.

I’ll quickly check that everything is okay.

Auto-summary is disabled, the network commands\n

Finally I’ll go on R1 and do the same configurations,\n

get a little more in depth about how EIGRP\nworks.

Notice how quickly EIGRP forms adjacencies\n

Okay, first up I’ll check DO SHOW IP PROTOCOLS\nlike the others.

Auto-summary is disabled, I’ve configured\n

a passive interface, and you can also see\n

EIGRP was successfully enabled on its interfaces.

Let’s check a better command to view the\nEIGRP neighbors.

OSPF has basically the same command to view\n

You can see R1’s two neighbors, which interface\n

that you don’t need to worry about now.

Let’s also check if R1 is receiving the\ncorrect EIGRP routes.

DO SHOW IP ROUTE, and you can actually filter\n

routing table by adding EIGRP on the end like\nthis.

You can also do commands like this, DO SHOW\n

If we configured static routes you could see\n

But this time, let’s view the EIGRP routes.

Notice the ‘D’ that indicates EIGRP routes.

So, R1 has routes to the loopback interfaces\nof R2, R3, and R4.

Also routes to the 10.0.24.0 subnet between\n

and R4, and 192.168.4.0/24, R4’s internal\nnetwork.

Notice EIGRP’s metric numbers, for example\n

Fortunately, when we move to OSPF you’ll\n

Okay, now one last command, this one is important\n

Here you can see more detailed information\n

just the ones in the routing table.

For example, here are two routes to 192.168.4.0/24,\n

That’s the route via R2, since it has a\n

Okay, it’s time to go into lecture mode\n

First off let me explain a little bit more\n

By default, EIGRP uses bandwidth and delay\n

This is the formula used to calculate metric.

It looks quite complicated, but there’s\nno need to memorize it.

Notice the ‘K’ values, K1, K2, K3, K4,\nand K5 in the formula.

The default K values are K1 = 1, K2 = 0, K3\n

K1 is multiplied by bandwidth and K3 is multiplied\nby delay.

Since you don’t have to worry about memorizing\n

metric yourself, you can just think of EIGRP\nmetric like this.

Metric equals bandwidth plus delay.

But there’s something else you should know,\n

It’s not simply bandwidth plus delay, but\n

path to the destination, plus the delay of\n

For example, let’s say R1 wants to send\n

The route via R2 is the best.

So, the bandwidth of the slowest link, that’s\n

links, these three, and then you get the total\n

By the way, the routers don’t actually send\n

link, the ‘delay’ value is actually a\n

So, what should you remember about EIGRP metric\nfor the test?

Remember that it’s calculated by adding\n

Now let’s cover some important EIGRP terminology.

Feasible distance means THIS ROUTER’s metric\n

From R1’s perspective, trying to reach 192.168.4.0/24\n

from R1 to R2, then R2 to R4, then for R4\n

But, there is another term you should know.

Reported distance, which is also known as\nadvertised distance.

This is the neighbor’s metric value to reach\nthe destination.

So, for this route the neighbor is R2, the\n

Note that these terms are NOT related to the\n

EIGRP uses the term ‘distance’, but this\n

not the administrative distance which is used\n

Let’s take a look at the real costs in Packet\nTracer.

Here’s the output of the SHOW IP EIGRP TOPOLOGY\n

The number on the left is R1’s metric, the\nFeasible Distance.

The number on the right is R1’s neighbor,\n

How about the route below it via R3?

This is the feasible distance, R1’s total\n

This is the reported distance, R1’s neighbor\n

Why is it important to know both of these\nterms?

You need to know them to understand the next\n

Here are the next two terms.

Successor is the term for the route with the\n

In this case, which route to 192.168.4.0/24\nis the successor?

It’s the route via R2, because it has the\n

A Feasible Successor is an alternate route\n

but it must meet the ‘feasibility condition’.

What is the feasibility condition that must\nbe met?

A route is considered a feasible successor\n

the successor route’s feasible distance.

So, does the route via R3 meet this feasibility\ncondition?

It’s reported distance is 28,416.

The successor route via R2’s feasible distance\nis 28,672.

28,416 is less than 28,672, so the route via\n

Why does EIGRP have this system of feasible\nsuccessors?

It’s a kind of loop-prevention.

If a route meets the feasibility requirement,\n

I’m not going to spend time explaining that\n

With that knowledge, let me now explain how\n

unique feature of EIGRP, because other routing\n

So, here is some output from the SHOW IP PROTOCOLS\ncommand.

Down here it says EIGRP maximum metric variance\n1.

With a variance of 1, only equal cost multipath,\n

This means a route’s feasible distance must\n

Actually, if another route’s FD is equal\n

is a successor too, there can be multiple\nsuccessors.

So, with the default settings EIGRP doesn’t\n

For example, these are R1’s routes to 192.168.4.0/24.

This is the successor route’s FD, and this\n

It’s higher, so it can’t be used to load-balance.

So, from EIGRP configuration mode I used the\n

Well, it’s basically a multiplier.

VARIANCE 2 means that feasible successor routes\n

FD can be used to load-balance.

Let me explain with our example.

The successor’s FD is 28,672, but I just\n

The feasible successor’s FD is 30,976.

30,976 is less than 57,344, so the route via\n

I’ll show you in the next slide that it\n

But let me emphasize one thing.

EIGRP will only perform unequal-cost load-balancing\n

If a route does’t meet the feasibility requirement,\n

This is because the feasibility requirement\n

so the router will never ignore it and put\n

Here is that route to 192.168.4.0/24 as shown\n

Notice that, even though the two routes have\n

However, R1 will send slightly more traffic\n

lower metric, it’s a faster path.

Before finishing up let me review those four\nterms.

A route’s feasible distance is THIS router’s\n

A route’s reported distance is the neighbor\n

Remember that this is also called ‘Advertised\nDistance’.

A successor route is the route with the\n

However, there can be multiple successors\n

A feasible successor route is an alternate\n

And finally, that feasibility condition is\n

if it’s reported distance is lower than\n

Now, at this point I usually show you an extra\n

did this mini-lecture and I found a really\n

Okay, for today's Boson ExSim practice question,\n

So, click on 'launch simulator' and here it\nis.

Select the following EIGRP terms from the\n

over the corresponding definitions.

So these are the four terms we just looked\nat.

Advertised distance, which is reported distance.

So, they give slightly different definitions\n

The best path to a destination network.

A backup path that is guaranteed to be loop\nfree.

And the metric that the next hop router, the\n

So pause the video here to match those terms\n

Okay, hopefully you got the answer.

So, two of these terms, the ones with 'distance'\n

And these two, successor and feasible successor,\n

So for example, successor is the best route\n

Or as Boson puts it, the best path to a destination\nnetwork.

And feasible successor is the other kind of\n

be loop free, that is an EIGRP feasible successor.

Okay, now we have the two kinds of metric.

One of them is the best metric along a path,\n

So, the metric that the next hop router has\n

It is the distance, the metric, that the neighbor\n

And finally the feasible distance is the best\n

So, click on 'done', then 'show answer'.

So this is Boson's explanation here.

And also it has a reference to some Cisco\n

This Cisco documentation is also a great resource\nby the way.

Okay, so if you want to get a copy of Boson\n

Actually, I'm studying for my CCNA now.

I already have my CCNA but I want to take\n

So I'm using Boson ExSim to help guide my\n

So once again, if you want to get a copy,\n

Before finishing today’s video I want to\n

Thank you to Ed, Tillman, Value, Magrathea,\n

Tibi, Vikram, Joyce, Marek, Velvijaykum, C\n

Software, the makers of ExSim, Charlesetta,\n

Sorry if I pronounced your name incorrectly,\n

One of you is still displaying as Channel\n

me know and I’ll see if YouTube can fix\nit.

This is the list of JCNP-level members at\n

2020, if you signed up recently and your name\n

Please subscribe to the channel, like the\n

with anyone else studying for the CCNA.

If you want to leave a tip, check the links\nin the description.

I'm also a Brave verified publisher and accept\n