Configuring a Router Interface

NEW Cisco CCNA IPv4 Course! Introduction to Basic Router Configurations and IP's
10 minutes
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All righty. Welcome to the Interface Configuration portion. You saw the other one that wasn't so bad a lot of commands a lot of commands we're gonna have access to all these PowerPoints and the resources Okay, now he's going to do the interfaces we have a Fast Ethernet interface and a serial in the lab we do right we are going down and sir going across. So the fastest everybody is normal normal configuration, IP address, turn on description, sir interface, the same thing but you gotta add a clock rate. Now the high end routers already have a clock right in there is basically just for synchronization. All right, all the signals to get across.

It all depends really on the actual physical speed of the network. You can vote you know, you put that okay but on the DC are thinking about really a lot of you cereals but on the ones that do, you would do it on the DC portion that data communications equipment portion of it by dt you do not okay. But let's go do this. Okay inside the lab, and let's configure See there. Alrighty, welcome back. So now that we did the basic administration, we're going to do the interfaces, the interfaces.

As you can see, we have Fast Ethernet and we have circles for going into that. One of the things that we didn't do that I did, you know, through the power of editing. Alright, is this command right here, under your telnet lines, your line bt wise, okay, transport input SSH. That is what's gonna allow you to just do SSH, well, you won't be able to do telnet will just be able to SSH from your PC, in this case, to your router, and that's really the way it is. So now both routers have the same configurations, all right, because I went ahead and again, you know, put all the code Man's in there. But obviously, I use my handy dandy notepad to copy all that stuff in there and just paste it on the other router.

And that's how you're gonna do the real world. But know the commands because you got to know the commands in order for you to be able to put it on notepad to understand. So later on when it comes to troubleshooting, you know what's going on. So, let's go to our first router, which is router one. That's the notepad as you can see, router one, or router zero, whatever I want. I'm going to exit out of here.

But we're going to stay within global configuration. Right, we're going to do a do show IP in brief. And just so you know, in the CCNA you will not be able to do the do command, you have to go back to privileged mode and do a show IP in brief. Okay. And you see we are at 0001. You see the interfaces that we have, well, we need to configure the F 00 and the serial users are so I'm going to go into ain't short for interface Zero slash zero enter IP address 192 dot 168 dot one dot 254 255-255-2550 all right and you have to do a no shut that turns on the interface because all interfaces are off because he says administratively down right over here.

All right so you do that no sharp command to turn it on. Also will be nice if you put a description in there I this is this is a connection these are the connection to my land on our or you put more be more specific my last but not my last. So this is your fancy dinner. I was just on more commands you can do you can go ahead and change the bandwidth I made you question market. You see all these different things that you can do on there. Okay, duplex settings, all these different things.

Okay. But for our purposes, for IPS just put in IP address, turn it on, while IP address and subnet mask Turn on and then put a description put a description on there so we know what line we're connecting to. All right and then I'll the serial interface as zero slash zero slash zero, enter IP address is a different network than the one that one dot oops, my that was my cursor. No one, no one not 52552552252 somebody is coming up, don't worry. Now a serial interfaces if you're using an actual serial cable, one side of it is DC was usually the serial 000. But in routers like this, either one can be the cable that determines where you put a clock rate which does the synchronization of the data in order to be able to be sent out.

So clock rate and higher routers, usually we'd have a clock rate like 12 million, but I'm just so used to putting 4 million 123 123 right. And it is all what we used to make when we first started and help desk right $4 million a year. And then no shot. Do not forget the clock rate on the on the serial interfaces, if asked because you probably get a layer two encapsulation error or synchronization error or something like that, all right, it will be a layer two error, okay, due to the clock rate. So we got those interfaces done and how would you verify that you do a show or I did a Ctrl Z show IP in brief. And now we have you see they're up up, but this one is down, down, down.

It looks like it is a physical issue. It's just the fact that we haven't gotten to the other side and configured the actual router. Okay. All right. So let's go ahead and do that. Let's go to router two which is already configured due to the magic of Notepad.

All right, we're gonna exit out of here. We're going to go again this is interface. Well, in this particular case, this interface is S 001. Okay, so let's go back to our router. Okay interface s zero slash zero slash one, enter, IP address 10 dot one dot one dot 625 525-525-5252 planning, planning no clock rate data. This is the DTE side, data terminating equipment, always data communications equipment, which means the clock rate and just your description or women, there's really no shot.

All right, and then we'll put our description description because we didn't do it on the own, I think connection to our one and you see how the logging synchronous, it did not interrupt my typing, I got feedback, but I'm still on the same line connection to our one. So we are To the interface going down interface F Zero slash zero IP address 192 dot 168 dot two dot 254 255-255-2550. And then again description I'm going to do it you should know that you should know by now anyway, no shot, wr wr and as you control Z and do a show IP in brief. And now we see that we have up up going to the fastethernet 00 which is right here, above right and then we have all bought on the cereal. So we should be able to ping right um 10 dot one dot one dot five and we should be able to ping 192 dot 168 dot two dot one That's our computer.

And we do you know, Ethernet, we have the ARP, but we're not going to be able to ping across the network, one dot one, we're not going to be able to ping across the network. Because we have no routing protocol. We're not doing any type of routing. So there, it's not going to happen. But just to show you real quick, something real quick one of the IPS that we said we could not use, because it is reserved IP route and I showed you that earlier or not earlier in another session 000000 and we're going to use the exit interface, which is s zero slash zero slash one. Okay, and enter.

This is what's called a default route. If you look at it. Now, if you look at the routing table show IP route, you're going to see that you have the gateway of last resort is set to this particular one, and you're gonna see a little x with an asterisk. Okay, now we're going to go to your router Same thing, I think t IP route 000000. And then my exit interface F Zero slash zero slash zero, enter. To go to our, what that means is, Hey, don't drop any packets just match exactly when that work matches, like the max sent me that way.

But I show IP route, which will appear up there as your default network. Now we're go here to our PCs. Okay, and we go to the command prompt, and we try to ping across the network 192 dot 168 dot two dot one, we get a reply, because we're using a default route, a default route. And that's the reason we had to do it. Again, a little more information that needed but just so you know, because that was a reserved IP address. This is one of the things that we use it for all of our default routes, and we and they're all again only using stored routers.

That's why you only see two routers here. There's only one way in and one way out of the network. So default route Not only point in one direction, wanted to go this way, right and no one wants to go that way. It is used for not dropping. So the route Hey, don't drop my packets just send it to the next router. And that's what's going on.

But you can see now we have network connectivity. We have basic configurations on our routers, plus their IP addresses. But all this is possible because of planning, planning, and you're saying, hey, how does he know all these numbers? Because I planned it before I started it right? And that's what you do. Also network, always keep that very important.

Very important. See everybody next

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