1
00:00:00,150 --> 00:00:06,720
Now that we've been able to telnet from the network automation container to the router and make changes

2
00:00:06,720 --> 00:00:10,860
to it, let's do something similar with the switch.

3
00:00:11,940 --> 00:00:17,520
So on the network automation container, we currently have a script Python three one API.

4
00:00:17,760 --> 00:00:23,810
I'm going to copy that script to another script called Python 32. p y.

5
00:00:24,480 --> 00:00:31,560
So we've now got two scripts and what I'll do now is edit python 32. p y.

6
00:00:33,070 --> 00:00:37,030
In this example, we want to configure a different device.

7
00:00:37,150 --> 00:00:40,030
So let's configure the switch with IP address.

8
00:00:40,030 --> 00:00:43,330
1921681 2272.

9
00:00:44,080 --> 00:00:45,850
He has the console of the switch.

10
00:00:47,590 --> 00:00:49,010
So I'll give it a name.

11
00:00:49,030 --> 00:00:50,020
Switch one.

12
00:00:50,350 --> 00:00:53,680
Do show IP interface brief.

13
00:00:54,160 --> 00:00:56,620
Shows us interfaces on the switch.

14
00:00:58,390 --> 00:01:00,220
What I'll do here is configure.

15
00:01:01,960 --> 00:01:04,269
The IP address on VLAN one

16
00:01:07,060 --> 00:01:16,090
slash 24 mosque and I'll no shut interface VLAN one so show IP interface brief again.

17
00:01:17,230 --> 00:01:24,490
We've now got vlan one configured with this IP address and the interface is up, up.

18
00:01:26,690 --> 00:01:32,040
What I now need to do is configure a username to be consistent.

19
00:01:32,060 --> 00:01:35,930
I'll keep it the same configure and enable password.

20
00:01:36,290 --> 00:01:43,670
In the real world you may want to use a secret password, but this is fine for our examples and allows

21
00:01:43,670 --> 00:01:51,320
us to verify our scripts as we can see the usernames and passwords used log in.

22
00:01:51,320 --> 00:02:01,190
A local is going to be used on the v lines and we're going to allow all protocols to access the v t

23
00:02:01,190 --> 00:02:01,940
lines.

24
00:02:02,740 --> 00:02:04,840
So back on the network automation container.

25
00:02:04,870 --> 00:02:06,460
I'll save that script.

26
00:02:07,090 --> 00:02:10,870
Let's confirm that we can ping the switch.

27
00:02:10,900 --> 00:02:12,010
Yes, we can.

28
00:02:12,310 --> 00:02:15,730
Can we telnet to the switch?

29
00:02:16,300 --> 00:02:17,320
Username is david.

30
00:02:17,320 --> 00:02:20,140
Password is cisco type enable.

31
00:02:21,000 --> 00:02:28,230
And the answer is yes, we can telnet and access enable mode onto the switch from the network automation

32
00:02:28,230 --> 00:02:28,980
container.

33
00:02:31,010 --> 00:02:39,590
So on a script are we going to telnet to the switch IP address one on 21681 2272 we're going to prompt

34
00:02:39,680 --> 00:02:46,790
the user for the username and password and at this point the script is going to telnet to the switch.

35
00:02:47,690 --> 00:02:49,370
It's going to look for username.

36
00:02:50,270 --> 00:02:58,190
So again, we can confirm that the same process is used on the switch by telnet to the switch.

37
00:03:00,940 --> 00:03:03,160
So telnet to the switch.

38
00:03:03,370 --> 00:03:08,200
Your username is what's prompted for and then password.

39
00:03:08,530 --> 00:03:14,170
So this code can be reused for the telnet connections to the switch.

40
00:03:14,680 --> 00:03:18,970
All I've done at this point is change the IP address.

41
00:03:20,010 --> 00:03:20,700
On the switch.

42
00:03:20,700 --> 00:03:26,370
We need to tap, enable and the password of Cisco so that stays the same.

43
00:03:26,580 --> 00:03:35,220
We then go to global config mode and rather than creating loopback, let's configure VLANs on the switch.

44
00:03:35,790 --> 00:03:40,200
So I'll configure VLAN two and give it a name.

45
00:03:41,400 --> 00:03:43,410
Of Python.

46
00:03:43,560 --> 00:03:44,850
VLAN two.

47
00:03:47,130 --> 00:03:54,090
So basically on the switch, we're going to go to global config mode type VLAN two and then configure

48
00:03:54,090 --> 00:03:58,830
a name of Python VLAN two.

49
00:03:59,010 --> 00:04:01,020
So let's do it like this.

50
00:04:03,130 --> 00:04:10,180
So hopefully when we run the script, we should see a result like this.

51
00:04:10,810 --> 00:04:17,230
So what I'll do is remove vlan two from the switch show vlan

52
00:04:19,240 --> 00:04:20,019
brief.

53
00:04:20,800 --> 00:04:24,250
We only have the default vlans on the switch.

54
00:04:24,970 --> 00:04:34,810
What I'll do here is delete a lines by using control k and then I'll copy these lines into the script.

55
00:04:36,250 --> 00:04:44,470
Now programmers with lots of experience will tell you that you should use loops and not duplicate code

56
00:04:44,770 --> 00:04:46,060
like we're doing here.

57
00:04:47,020 --> 00:04:48,580
Again, that is true.

58
00:04:49,270 --> 00:04:51,460
We'll get to that later.

59
00:04:52,760 --> 00:04:57,410
For now, let's configure VLANs two, three, four and five on the switch.

60
00:04:57,860 --> 00:05:04,040
Later on, we'll use a loop to configure 100 VLANs on the switch.

61
00:05:04,580 --> 00:05:10,010
After the moment we only have VLAN one as the ethernet VLAN.

62
00:05:10,460 --> 00:05:12,800
We're not going to worry about these vlans.

63
00:05:12,830 --> 00:05:16,070
They are not supported on the switch anyway.

64
00:05:17,420 --> 00:05:18,680
I'll save the script.

65
00:05:19,160 --> 00:05:20,570
Python three.

66
00:05:20,570 --> 00:05:24,140
Python 32. p y.

67
00:05:25,280 --> 00:05:26,270
Username is David.

68
00:05:26,270 --> 00:05:27,560
Password is cisco.

69
00:05:27,590 --> 00:05:32,690
Before I press enter debug telnet on the switch.

70
00:05:33,200 --> 00:05:34,310
Press enter now.

71
00:05:35,030 --> 00:05:38,300
We can see that the script is telling to the switch.

72
00:05:39,150 --> 00:05:44,100
We can see on the network automation container that vlans were created on the switch.

73
00:05:44,520 --> 00:05:47,040
So show VLAN brief.

74
00:05:48,130 --> 00:05:52,030
We can see that those VLANs were created on the switch.

75
00:05:53,660 --> 00:05:55,370
So it was as simple as that.

76
00:05:55,880 --> 00:06:08,690
To configure VLANs on a Cisco switch using Python, I could copy those lines of code and edit those

77
00:06:08,690 --> 00:06:11,690
lines to create more VLANs.

78
00:06:12,950 --> 00:06:14,390
So let's create.

79
00:06:17,150 --> 00:06:18,590
Eight VLANs on the switch.

80
00:06:18,620 --> 00:06:28,340
For example, so VLAN six, seven and eight will now be created on the switch back on the switch once

81
00:06:28,340 --> 00:06:30,860
again we only have VLANs.

82
00:06:30,860 --> 00:06:32,900
One, two, three, four and five.

83
00:06:33,590 --> 00:06:35,390
But if I run the script again.

84
00:06:37,900 --> 00:06:43,360
Script telnet to the switch and has created these additional vlans.

85
00:06:43,690 --> 00:06:46,000
So show vlan brief.

86
00:06:47,520 --> 00:06:50,160
They are the vlans on the switch.

87
00:06:52,810 --> 00:06:55,510
So we've now got two scripts.

88
00:06:56,830 --> 00:06:57,580
Python three.

89
00:06:57,580 --> 00:06:58,720
Python three, one.

90
00:06:58,900 --> 00:07:01,780
P y makes changes to the router.

91
00:07:03,460 --> 00:07:07,450
Three two makes changes to the switch.

92
00:07:10,450 --> 00:07:13,270
These are, again, very simple scripts.

93
00:07:16,610 --> 00:07:25,070
But hopefully it shows you how you can configure network devices using Python with just a few lines

94
00:07:25,070 --> 00:07:25,850
of code.

95
00:07:26,480 --> 00:07:33,260
This is not a very large script, but we've been able to use the script to make changes to the network

96
00:07:33,260 --> 00:07:34,250
devices.

97
00:07:34,880 --> 00:07:38,300
Now again, you may want to use a more powerful.

98
00:07:39,370 --> 00:07:47,260
I.D. to make your changes so you could use something like sublime text, pie, charm or something else

99
00:07:47,260 --> 00:07:53,410
to do your actual editing, and then you can simply paste those scripts into the network automation

100
00:07:53,410 --> 00:07:54,130
container.

101
00:07:54,700 --> 00:08:01,570
I'm going to do that later in the course as our scripts become more powerful and more complicated.

102
00:08:02,020 --> 00:08:08,080
I just want to get you started automating once you get started and see what's possible.

103
00:08:08,200 --> 00:08:15,070
Hopefully you can think of other scenarios and other things that you can do using Python to automate

104
00:08:15,070 --> 00:08:15,910
your network.