Time
23 hours 18 minutes
Difficulty
Beginner
CEU/CPE
14

Video Transcription

00:00
Hello and welcome back to I, C and D one interconnecting. Cisco never devices part one. This is upset to four to interface options and auto negotiation. Less video. We just went over the 2.4 overview on some pre assessment questions in this episode of recovering some of the interface options to include speed and duplex and along with what? Auto negotiation is
00:22
learning objectives for this episode, we're gonna go over auto negotiation. We're gonna go over the duplex description and configuration and then the speed, description and configuration options
00:33
and is always quick pre assessment here. If auto negotiation has set on an interface of a switch and the hostess hard coded 200 megabits per second at full duplex,
00:44
what will the switch set its interface to assuming that it doesn't fail.
00:51
All right, it is 100 megabits per second, Half duplex over. Why here in a minute?
00:57
I need a quick lab note here, So
01:00
I've disconnected my so whole router from switch one because I'm just gonna working on that for now
01:06
s. So I still have my Windows 10 hose hooked up to the SoHo, which is fine.
01:11
Um, I turned off the A boot to server does have issues with the firewall configuration of it.
01:17
I just threw up a Cali Lennox VM instead.
01:21
I'm gonna have my boon to laptop off to the side as well,
01:25
both unplugging to switch one. And I put the
01:27
switch Networking Lab network on 10 dot Want to slash 24
01:33
summer slash 24 is 2552552550 for the subnet mask.
01:42
So if we go into configuring, speeded duplex, remember duplex. The heft duplex is only one can transmit and receive a time, right,
01:52
so it's either transmitting or it's receiving and full duplex that can do both at the same time.
01:57
So the picture you see after the right there is hard coating. Your Windows interface is if you go down to your network options, adapter options and then go to the properties.
02:08
If you want to advance into the controller properties, you can actually see speed and duplex and set it to what you want.
02:15
I keep mine on auto negotiation because I just use a basic stuff,
02:21
but I'm gonna go ahead and bring up the party session here. I'm Consul into the switch.
02:28
All right, so what? I should have show i p
02:35
interface brief.
02:38
All right, so if we look, Iet's have the V Line one set,
02:43
I have interface to set to the Kelly VM and your face fast. Either. 06
02:50
is my gateway boon to let up.
02:53
So what we're gonna do here,
02:55
uh, it's going to configure terminal in her face a sec 02
03:02
if you go to speed question, mark.
03:06
So here's the two difference or three different options I have here because this is a switch. Interfaces are fast Ethernet. So it goes to 100 megabits per seconds.
03:15
I
03:16
I have a couple G s, f p's and one of my other switches, but for now, we're gonna work with Fast Eastern. So here's the three different options so we can go ahead and just set that to auto if we want.
03:29
And if we do the same thing with Do Flex once for an interfaith interface configuration, we had the three different options there, So we're gonna set that one toe auto as well.
03:39
Oh, no.
03:42
Okay.
03:43
And those are automatically at auto by default.
03:47
So show Ron interface. If they too?
03:54
Ah, I wasn't here too, right? Yeah. Um, so because they're in, if they're zero to, it's not actually gonna show it, because it is a defaulted already.
04:02
Um, like, if we weren't going to speed interface, FAA is there, too.
04:09
Speed 100.
04:13
And then we'll just go up
04:15
to this one again. So now it actually shows speed 100.
04:21
All right,
04:24
so one thing we can do to hear, um
04:28
So if you want to remove that, let's say
04:30
if it doesn't negotiate with those consequences Phase two, how to remove that? We could do know the no command will remove the option.
04:41
You could just even do no speed
04:44
and to run the show commands from inside interface configuration. You can run Do
04:50
show, Ron interface a phaser to
04:56
I can't see.
04:58
So that big saying there you can run, do
05:00
to run the show commands from the interface configuration. But see how the speed is now removed with that. No command.
05:08
So we're gonna do is we're gonna set a description for this one. For when you do care.
05:15
Generally
05:16
the m
05:19
all right.
05:21
And what we're gonna I'm gonna go into F 06 and do a description there for
05:29
to let up.
05:32
No other useful thing here, ISS we're just going to wear in global configuration. If we do interface
05:40
range
05:41
if a 02
05:44
six, we need a comma,
05:48
so it's actually gonna bring in both of those now. So now if we set a
05:55
let's do a speed
05:57
100
05:58
and both those
06:00
Let's just do a show run real quick.
06:04
You'll see on these two interfaces we have Speed 100 here, Speed 100 here You can also do an actual
06:15
range of was Dude, if Israel two through six
06:19
and we can just set the duplex too,
06:24
before
06:27
way wrote a show running in.
06:33
So now we see
06:34
all the ones
06:36
two through six is had a full I'm gonna go ahead and because of that real quick.
06:43
Okay, I'm on auto negotiation. What? This We go back real quick. Remember, Ethernet standard is time, megabits per seconds. Fast. Ethernet is 100 megabits. Gigi is 1000 megabits per second or one gigabit per second.
06:57
Um, the little two at three. You is. Actually it will hit the
07:01
on a negotiation protocol for IEEE.
07:04
Um, So what are the negotiation does is the switch in the computer kind of talk over a different band with than normal traffic, and it'll determine what speed and Duplex wants to run at for auto negotiation.
07:18
Now, for some reason auto negotiation fails, the default is to use your slowest supported speed.
07:25
So if your speed is 10 slash 100 megabits per second,
07:30
it's gonna use half duplex and then use 10 megatons per seconds. If the
07:34
if you have a gig e switch into gigi interface,
07:39
it will actually go to full duplex
07:42
with Cisco Switches. They can actually detect the speed pretty well.
07:45
It will choose the supporters speed, speed, but still use the IEEE default for duplex,
07:50
meaning that if you have a 10 megabits per second slash 100 megabits per seconds device,
07:58
it's still gonna use half duplex. But then it's going to set it at 100 megabits per second. But no, that's you. But this was Cisco switches. What the I triple E default is to use 10 megabits per second half duplex.
08:09
So Cisco does pretty well, and they can actually kind of bug your speed up a little bit. But you're still using half duplex, so it's still gonna slow it down.
08:16
Uh, hubs is going too often. Default to 10 megabits per second. Half duplex. Remember, because they don't recognize that signal. And then it has to use the CSM a CD, the collision detection
08:30
in order to send.
08:33
So, Puddy,
08:35
let's do a pretty face.
08:41
I want to do a range s second. Do everything
08:46
things air two through six speed auto
08:52
duplex.
08:56
It's kind of hard to read when everything's screwing like that. Okay,
09:01
so now if we go into show, I'd be
09:05
do a show interface status.
09:07
It will actually show you the
09:11
see. We're on auto Full Auto 100 at a full auto 100
09:16
as of that day is
09:18
because if we just had it hard coded a fall, you would just see full and same thing with that. You just see 100. You wouldn't see that a next to it.
09:26
Okay, so I'm actually going to demo reel quick, hard coating in the boon to laptop with the East Tool
09:33
Command. Turn off auto negotiation would set the speed to 10
09:39
and a duplex 1/2.
09:41
Okay, so I'm gonna go ahead and pop the Webcam on. I'll just show you what I see on my side here and the
09:46
laptop.
09:48
Um, I apologize if I'm a little flustered right now. I forgot I tried to do in my Kelly VM. Um it forgot that for some reason, all my virtual machines don't like setting the duplex level. For some reason, I don't know why,
10:01
but I got the letter X laptop going to laptop set up with it. So going to pop the camera on,
10:07
I'll show you.
10:13
We run a show in status,
10:20
we will see that the
10:22
going to laptop is set at half in 10.
10:26
Because this auto negotiated to that.
10:28
Now, if we were the hard coldness to full 100 you would see a lot of missed packets. You'd see a lot of random.
10:37
There's networking issues. It would seem like it's real slow.
10:43
Um,
10:43
they're gonna run into a lot of problems. So if you come into your switch and run a show interface status, you see that one of these air half are set to half,
10:54
but not auto.
10:54
Uh, you know, check the configuration of device, see if that one set to half you know, check the speed on it.
11:01
Make sure these air since I'll negotiate Note,
11:03
you might say Why? Why do I not want to
11:07
Hard Cody's right.
11:09
So? So, with key devices, I would actually harder. You can hard code these, you know, if you know that
11:15
the
11:16
speed between switches is gonna be gig level or one gigabit per second.
11:22
Um, yeah, absolutely hard code That too, you know, 1000 and full, because that's not gonna change. That's always gonna be the same. But for,
11:31
you know, my my laptop here, it will only run at fast Internet levels. Where is my, you know, my virtual machines and big Tower is gonna run at full gig levels. So if I were the hard code,
11:45
you know, 100 that is,
11:48
you're gonna run into some issues.
11:50
All right, So we're gonna go ahead and move into the post assessment here. What is the defaults if auto negotiation fails?
11:58
So
12:01
if for some reason that auto negotiation does work, what is the IEEE default? Give you a few seconds.
12:09
All right? Hopefully you got 10 half
12:13
from those theatrically DVD defaults. The Cisco switches can determine the speed
12:18
what is always gonna be at half level? Um, so
12:20
is a default. Know that 10 megabits per second and 1/2 is the
12:24
or negation failure rate.
12:28
All right, into the next episode, we're gonna go into port security and how we're gonna secure switches with it.
12:33
And as always, if you guys have questions, I need some help. Shoot me a message. We'll be happy to help out. Otherwise, thank you for washing this episode. I look forward to teaching the rest a lesson together.

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CCNA ICND1

This course will enable students to understand virtualization and cloud services, and network programmability related to LAN, access and core segments.

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Trenton Darrow
Network Engineer at NCI Information Systems, Inc
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