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In this section, we are going to start learn about
network automation. We will use paramiko first.

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In the previous video, we already
learn how to install python package.

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And now we already have paramiko,
let’s check it, pip3 freeze,

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Here we can see that we already have paramiko.

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To make sure that paramiko is installed
correctly, we can go to python interpreter,

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and then try to import paramiko.

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If we don’t get an error like this, so
paramiko is installed correctly. Exit here.

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Go to sublime, let’s create a new folder here,

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let’s say lab-paramiko.

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Inside lab-paramiko, let’s create new
file, let’s say paramiko_basic.py.

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Save this, let’s check in the ubuntu server,
here we can see that we have folder lab_paramiko,

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let’s see inside lab_paramiko, here we can
see that we also have paramiko_basic.py.

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Now let’s write a python script to do network automation.

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I already write the script to do network automation,

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so I will just copy and paste the script,
and then I will explain the script to you.

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Okay this is the script, we have 24 lines
of code here. Let’s learn this code.

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First, here we import the paramiko. Here
we also import package time and getpass.

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So this is some package that we
are going to use in this code.

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Paramiko is not installed by default, so we
need to install it using pip3 install paramiko

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like we do in the previous video.

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But time and getpass is installed by default,
so we don’t need to install it anymore.

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we will talk more about the
function of time and getpass later.

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For paramiko, the point is, we will use
paramiko to remote the router using ssh.

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For example, in the normal way,
if we want to remote the router,

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we can open a terminal and then type ssh
username@ the ip address of the router.

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and then we need to type the password
and we success ssh to the router.

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Okay, so that is the normal way.

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Now, if we want to do network automation,
we need to remote the router from python.

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Paramiko is a package to remote
the router using ssh from python.

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Next here we ask input from user,

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and then the data that inputed by user
will be saved in the ip_address variable.

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Here we also ask an input from user
and save the data to username variable.

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For the password, we use getpass library,

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so getpass.getpass. This is means that we
call getpass function inside getpass library.

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So the first getpass is the
name of the library or package,

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and the second getpass is the name of
the function inside getpass library.

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What is the function of this script?

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This is same as input, but the differences is,

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if we use getpass, everything that we
type will not shown in the terminal.

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Let’s try it, go to python
interpreter, let’s try input first,

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Ip_address = input and then ip address. Enter.

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Here we need to input the ip address, let’s
say 192.168.1.1, let’s print the ip_address,

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okay here we can see that the
value of ip_address is 192.168.1.1

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Now let’s try to use getpass,
let’s import it first,

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And then password getpass.getpass, enter this,

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Here we can type the password, let’s say 123.

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Here we can see that we can not see
anything that we type.

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Let’s just enter here, and then let’s print the password.

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Here we can see that the value of password is
123. So remember that the function of getpass

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is just like input, but everything that
we type will not shown in the terminal.

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Okay, then here we create a variable ssh_client,

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this variable is a ssh client
function from paramiko.

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Next here we define set missing host key
policy auto add policy. This is means

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that we add the key from the router
automatically to the ubuntu server.

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If you remember, when we remote a router for the
first time, we need to type yes. Let’s scroll,

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Here we can see that we remote router 3,
and here we need to type yes to continue.

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So that is the function of this script.

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Next, here we connect to the router. Here we
have hostname, this is argument from paramiko.

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So we need to use hostname, we can not change
this, the hostname is ip_address variable.

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This is a variable that we already created
before. The username is username variable,

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and the password is password variable.

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If the variable that you create is not username,
let’s say user, so here will not username,

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but user. So remember that this is
based on variable that we have created.

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Let’s say again the variable is not password,
but passw, so here we also need to use passw.

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Here we print that we success
login to the ip address,

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so remember that this the variable
that we have created before.

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Next here we invoke shell, this is
means that we go to the cisco shell.

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After that, we can type the cisco command,

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Herer we can see configure terminal,

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and then backslash n, this is means enter, so
here we type configure terminal and then enter.

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Next here we create interface loopbcak0,
and don’t forget to enter, the ip address

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is 1.1.1.1 255.255.255.255, once again,
don’t forget to use backslash n or enter.

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So the point is, this script is used to
create interface loopback 0 in the router,

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and the ip address for loopback0 is 1.1.1.1

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But this is public ip address, let’s change this
become private ip address, let’s say 10.1.1.1.

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Next here we have time sleep 1,

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this is means that the script will stop for 1
second to wait the cisco command is executed.

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May be some of you have a question, how if we not

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use time sleep? We will answer that
question later in the next video.

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Okay, next here we save the
output to the output variable.

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Here 65535 means that we save 65535 character.

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And then decode here. In python3,
the type of the outuput is byte,

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so we need to decode the result like this.

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Later in the next video, we will try to
remove this decode and see what happened.

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Here we print the output. And last,
here we close the ssh connection.

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Save this.

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If we see circle black like this, this is
means that the script is not saved yet,

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if we already save the script, the
circle black will gone like this.

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Now let’s go to ubuntu server, exit, ls, let’s go
to lab paramiko directory, cd lab_paramiko. Ls,

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Here we can see paramiko_basic.py, this Is
the script that we just create in the sublime.

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Let’s run this script, but before that, let’s make
sure that the router is don’t have loopback0 yet,

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let’s check on router1, show ip interface brief.

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Here we can see that we have fast ethernet,

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a lot of serial interface, but
we don’t have loopback0 yet.

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Now let’s run the script,

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Python3 paramiko_basic.py,

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Let’s remote the router 1, so the ip address
is 10.10.10.1, the username is cisco,

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and the password is also cisco.

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Here we can see that we are success login to
10.10.10.1, and here we can see the configuration,

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configure terminal, interface loopback0, and
the ip address is 10.1.1.1 255.255.255.255.

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this is means that we are success
send this configuration to router 1.

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Let’s check on router 1 again,
do show ip interface brief.

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Here we can see that now we have
loopback0, the ip address is 10.1.1.1

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Okay so now we are success to do
network automation using python.

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I think enough for this video, in the next
video, we are going to learn more about time sleep.

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Thank you for watching and see you on the next video.