Learn Networking

19 Apr 2022 23:02

@mywritingsspot

Learn Networking

11 Jan 2017 05:45

I typed in “cl?” and the CLI tells me that there are two commands that start with the letters “cl”. There's the
“clear” command and the “clock” command.

Learn Networking

11 Jan 2017 05:32

Let's start with a simple example. We'll configure the clock on our switch so I can demonstrate how the CLI works:

Learn Networking

11 Jan 2017 04:59

That's it! We are now in privileged mode where we have full access to our device. You can recognize it because of the # symbol.

Learn Networking

11 Jan 2017 04:56

You can recognize it because of the > symbol. When you are in user mode you don't have full access to the device. What we want is privileged mode which is also known as enable mode.

Learn Networking

26 Dec 2016 08:00

If you type yes and press enter it will walk you through a wizard where you can configure some basic settings.

I'm going to skip it since we'll configure everything ourselves.

Learn Networking

26 Dec 2016 07:58

Once the switch is done you finally get to see this message:

Press RETURN to get started!

Learn Networking

26 Dec 2016 07:56

Once the POST is done we'll get a final warning:

Learn Networking

26 Dec 2016 07:43

IOS will check the flash drive.

Learn Networking

26 Dec 2016 07:40

IOS images are stored on the flash drive in a compress format, it will be uncompressed and copied to the RAM of the switch.

Learn Networking

26 Dec 2016 07:37

As soon as you power on the switch this is what it will do:
1. Check the hardware.
2. Locate the Cisco IOS image.
3. Locate and apply configuration (if available).

Learn Networking

18 Dec 2016 06:24

When you start putty it looks like this.

Learn Networking

18 Dec 2016 06:20

If you don't have a COM / serial port on your computer or laptop, use your USB to serial cable.

Learn Networking

18 Dec 2016 05:56

First of all we need to have a switch. I have a Cisco Catalyst 3560 that I'll use for my
demonstration.

Learn Networking

18 Dec 2016 05:22

We will start with the basic configuration of a cisco device.

First I will use a switch to demonstrate the CLI but the same commands work on a router.

Secondly I will demonstrate CCP on a router.

Learn Networking

23 Jul 2017 16:50

We will be back soon...

Learn Networking

11 Jan 2017 05:33

Whenever I partially type a command I can use the ? to see my options.

Learn Networking

11 Jan 2017 05:00

If I want to return back to user mode I can do this.

Learn Networking

11 Jan 2017 04:57

This is how we do it.

Learn Networking

11 Jan 2017 04:56

Right now you are in user mode.

Learn Networking

26 Dec 2016 07:59

If the switch does not have a configuration, you'll see the following:

—- System Configuration Dialog —-
Would you like to enter the initial configuration dialog? [yes/no]:

Learn Networking

26 Dec 2016 07:57

And finally you'll see an overview of the hardware that this switch offers.

Learn Networking

26 Dec 2016 07:55

And once it's done it will do a POST (Power On Self-Test):

Learn Networking

26 Dec 2016 07:42

Now IOS is loaded you will see something like this, you see this banner and the IOS version that I‟m running. This is a Cisco 3560 switch.

Learn Networking

26 Dec 2016 07:38

This is what it looks like on a real switch: Above you see that it‟s checking the flash drive of the switch. Next step is to load the IOS image that it found on the flash drive.

Learn Networking

18 Dec 2016 06:24

Make sure you select serial and type in the correct COM port number.

If you don't know the COM port number you can look it up in the windows device manager.

You need to leave speed at 9600. Click on open and you will have access to your switch.

Learn Networking

18 Dec 2016 06:23

The last thing you require is an application to connect to your serial port.

Putty is a good free application to start with, you can download it here:

http://www.chiark.greenend.org.uk/~sgtatham/putty/download.html

Learn Networking

18 Dec 2016 06:19

Secondly we'll need one of those Cisco console cables or we can't connect our computer to the switch.

Learn Networking

18 Dec 2016 05:55

This is the topology that I am using.

Learn Networking

14 Dec 2016 15:50

Cisco also offers a GUI (Graphical User Interface):
- CNA (Cisco Network Assistant) for switches.
- SDM (Security and Device Manager) or CCP (Cisco Configuration Professional) for routers.

SDM was the first version of the GUI but now it has been replaced by CCP.

The advantage of a GUI is that it has wizards that let you configure complex things with a few clicks.

The downside however is that:
A) you might have no idea what you are doing.
B) when you need to troubleshoot you'll need the CLI 9 out of 10 times. I'm not a big fan of the GUI but it's best to see for yourself.