All language subtitles for Free-CCNA-Configuring-OSPF-2-Day-27-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 lab we will configure OSPF in the\n

we learned in the lecture video.

For the purpose of this video I have already\n

It’s good to get some repetitive practice\n

this video a little shorter I won’t show\n

So, let’s get right into step 3.

We are told to enable OSPF directly on each\n

That means we won’t be using the NETWORK\n

an IP address that falls in the specified\nrange.

Instead we will specify exactly which interfaces\n

ENABLE CONF T. I’ll use the INTERFACE RANGE\n

Note that there is no need to enable OSPF\n

know about the 203.0.113.0/30 network, as\n

So, INTERFACE RANGE G0/0, F1/0, L0.

Notice how I enter the INTERFACE RANGE command.

If configuring a range like G0/0, G0/1, G0/2,\n

INTERFACE RANGE G0/0 – 3, with a hyphen.

However, in cases like this with three different\n

Ethernet, and Loopback, you can use a comma\n

IP OSPF 1, that’s the process-ID, AREA 0.

So, in the lecture video I showed you that\n

empty and instead the interfaces are displayed\n

However, that doesn’t display in Packet\nTracer.

As I’ve said before, Packet Tracer is a\n

This is just a small thing, but I just wanted\nto point it out.

Now let’s configure Loopback0 as a passive\ninterface.

To do so, we have to go into OSPF configuration\nmode.

I showed you the PASSIVE-INTERFACE DEFAULT\n

a single interface so I’ll use the regular\nmethod.

Okay, now I’ll just run through the configurations\n

CONF T. INTERFACE RANGE G0/0, F1/0, L0.

Then configure the passive interface.

CONF T. INTERFACE RANGE F1/0, F2/0, L0.

CONF T. INTERFACE RANGE G0/0, F1/0, F2/0,\nL0.

Here on R4 I’ll try out the PASSIVE-INTERFACE\n

Notice the message saying the neighbor has\n

OSPF can’t make any OSPF neighbors via a\n

Okay, let’s enable OSPF again on F1/0 and\nF2/0.

Let’s see if only G0/0 and L0 are passive\ninterfaces.

If the router had any other network interfaces,\n

router only has G0/0, F1/0, F2/0, and the\n

Now let’s check R4’s OSPF neighbors.

Looks good, R4 is neighbors with R2 and R3.

If I keep repeating this command over and\n

the dead time counts down to 30 and then resets,\n

Okay, that’s all for step 3, let’s do\nstep 4.

Configure the reference bandwidth on each\n

I hope you can complete this step, this sounds\n

AUTO-COST REFERENCE-BANDWIDTH, and let’s\nuse the question mark.

So, remember that this command is entered\n

So, how can we make it so a fastethernet interface\n

Well, a fastethernet interface has a bandwidth\n

The formula for OSPF cost is reference bandwidth\n

So, what divided by 100 equals 100?

So, enter 10,000 as the reference bandwidth,\nand let’s check.

In the lecture I showed you the SHOW IP OSPF\n

So, here’s FastEthernet1/0, and notice the\ncost of 100.

If a fastethernet interface has a cost of\n

Scroll up, and here it is, 10.

So, a 10-gig interface, or anything faster\n

Okay, let’s configure that on the other\nrouters.

Remember that it’s always a good idea to\n

AUTO-COST REFERENCE-BANDWIDTH 10000.

AUTO-COST REFERENCE-BANDWIDTH 10000.

AUTO-COST REFERENCE-BANDWIDTH 10000.

Next up we’ll configure a default route\n

Since I’m in OSPF config mode, let’s configure\n

DEFAULT-INFORMATION ORIGINATE.

Now let’s configure the route.

IP ROUTE 0.0.0.0 0.0.0.0, and then the Internet\n

Now I’m going to go on R4 to check which\n

In the day 26 lab video it added routes via\n

R2 has a faster gigabit ethernet connection,\n

Now that we have changed the OSPF reference\n

interfaces have a different cost.

So, what default route or routes will be added\n

So, what I’m going to explain now is a more\nadvanced OSPF topic.

You don’t need to remember it for the CCNA.

But I want to give a brief explanation in\n

First off, notice that R4 added the route\n

You might think that’s correct, because\n

fastethernet and gigabit ethernet interfaces\n

That means the route via R2 is preferred over\nR3.

However, this is actually another error in\nPacket Tracer.

BOTH routes, via R2 and via R3, should be\nadded.

Well, look at the cost of this route via R2.

With the reference bandwidth we just configured,\n

for R2 to reach R1, so 110 just to get to\nR1.

Why is the cost of this default route 1?

The answer is here, this ‘E2’ beside the\nroute.

If you look up at the top here for the meaning\n

As I said, this is a CCNP-level topic, so\n

But basically the ‘external type 2’ means\n

So, actually the cost via both R2 and R3 will\nbe the same, 1.

To prove that, I’ll shut down R4’s F1/0\n

We get a message saying the neighbor has gone\nfrom FULL to DOWN.

I’ll click this button to skip forward 30\n

See, now the route via R3, 10.0.34.1, is added,\n

So, for some reason Packet Tracer does not\n

Perhaps Packet Tracer’s logic is considering\n

though it shouldn’t, but if you try this\n

that both routes are added to the routing\ntable.

Anyway, like I said this is a CCNP topic,\n

I won’t cover this topic in my CCNA course\n

search for ‘OSPF external metric’.

Finally, let’s go into simulation mode and\n

Look at the Layer 3 destination, 224.0.0.5.

Do you remember that IP address?

That’s the multicast address used to reach\n

IP address that routers send OSPF hello messages\nto.

Now, if you click on the ‘PDU Details’\n

There’s the Ethernet frame, the IP packet,\n

I won’t go into any details, but let’s\n

First notice that the version number is 2.

As I said before, this is the version that\n

Well, it means this is a ‘Type 1’ OSPF\nmessage, a Hello message.

Remember, Hello is type 1, DBD is Type 2,\netc.

Under you can see the Router ID, and notice\n

Well, OSPF Areas are a 32-bit number, like\n

So, Area 0 can be written as 0.0.0.0.

Going down a bit, you can see the network\n

10 and 40 seconds, DR and BDR addresses, and\n

Okay, just wanted to point out a few fields.

Look here at the ‘pro’, protocol field\nof the IP header.

Didn’t I say that OSPF messages have a protocol\nnumber of 89?

Well, 0x59 means hexadecimal 5 9, which is\n

an OSPF message is encapsulated in the IP\nheader.

Okay, so in this lab we configured OSPF in\n

the reference bandwidth, advertised a default\n

Now let’s take a look at a lab in Boson\nNetSim for CCNA.

Okay, for today's Boson NetSim lab preview\n

So you can pause the video if you want to\n

But basically there is a new router that has\n

we have to configure OSPF here, and also troubleshoot\n

These are the commands you need to know, you\n

And the IP addresses on each device.

Okay, now let's look at the lab tasks.

Task 1, examine the initial network configuration.

Task 2, examine the remainder of the topology.

And task 3, verify network connectivity.

So, for today's lab preview let's just do\ntask 1.

So once again, you can pause the video here\n

I'll get right into step A, part 1.

Log on to the Key West router.

Okay, so I'll click on the Key West router\nhere, console.

Notice it says right here, all passwords have\nbeen set to cisco.

So first we have to log in to the device,\ncisco.

And then enable, and once again enter the\n

Okay, what command should you issue to display\n

Examine the output of this command.

What conclusion can you draw regarding the\n

Okay, so if OSPF is running, it doesn't seem\n

receiving any OSPF routes from neighbors.

Okay, part B, examine the configuration.

What command should you issue to display the\n

So, the currently executing configuration,\n

So the command is SHOW RUNNING-CONFIG.

So let's check for any OSPF configuration,\n

There is the router ID, and one NETWORK command.

Review the information you have gathered so\nfar.

Is the OSPF routing protocol running on Key\nWest?

As you can see here, there is some OSPF configuration,\n

If OSPF is running on Key West, what would\n

Okay, so I did notice something that could\n

0.0.0.0, that's /32 so it matches only 200.120.45.0.

Only that one single address, which I believe\n

Let's see, SHOW IP INTERFACE BRIEF.

So this network command does not activate\n

Okay step 4, in order for OSPF to send and\n

router interfaces must be configured for OSPF.

Examine the configuration and determine whether\n

What command is missing or configured incorrectly?

Okay, so I just answered that.

The NETWORK command is configured incorrectly.

Okay, step C, or part C, step 1.

Examine the information that you have gathered\nso far.

Briefly explain the main problem and how you\n

Okay, so I just explained that, the incorrect\n

So, in order to enable OSPF on these interfaces\n

/24 mask, so NETWORK 200.120.45.0 and then\n

First I will remove the incorrect command,\n

way to filter the output, SECTION OSPF.

So now I only see the OSPF configurations\nin the running config.

NO NETWORK 200.120.45.0, AREA 0.

Okay, now let's configure a new network command.

NETWORK 200.120.45.0 and a /24 wildcard mask\n

Okay, so I corrected the configuration error.

Then part D is 'verify OSPF behavior'.

After you correct the configuration error\n

So, I'll get out of OSPF config mode with\nEND.

Okay, I do not notice any changes.

Oh, looks like a neighbor just came up, let's\nsee.

I'll just check a few more times.

Sometimes it can take a little time for the\n

Okay, looks like the Key West router has formed\n

Indeed, .246, here it is, .246 Miami.

Okay, so it formed the OSPF neighbor relationship,\n

OSPF routes from the Miami router.

Okay, so if you want to try the other steps\n

If you want to get a copy, follow the link\n

Before finishing today’s video I want to\n

Recently I’ve noticed an increase in the\n

to all of you, both JCNA and JCNP-level members.

Previously I read out the names of all the\n

is getting longer so I’ll just leave the\nlist up here.

Your support helps me keep making and releasing\n

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.

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