1

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In the previous video, we have done looping to
do configuration on multiple router at once.

2

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Next in this video, we are going
to learn about write configuration.

3

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Remember that in cisco, the
configuration is not saved automatically.

4

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Let’s check here,

5

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do show ip interface brief exclude unassign.

6

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Here we can see that we have loopback0 until
2, but we don’t save this configuration yet.

7

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If the router is suddenly restart or shutdown,
the configuration will be gone. Let’s try,

8

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stop the router, and then start again.

9

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Let’s see the interface again, do show
ip interface brief exclude unassign.

10

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Here we can see that loopback0 until
3 is gone. But fa0/0 is not gone,

11

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why? This is because we already save the
configuration after configuring fa0/0,

12

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so the last time we save the configuration
is after configuring fa0/0 and ssh.

13

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After configuring loopback0 until 3,
we don’t save the configuration yet.

14

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This is why loopback0 until 3 is gone. But
configuration on fa0/0 and ssh is not gone.

15

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Let’s check it, ssh cisco@10.10.10.5,
this is the ip address of router 5,

16

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Okay this is success, so the configuration
on fa0/0 and ssh is still exists.

17

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But the configuraiton of
loopback0 until 2 is gone.

18

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Okay, so now, let’s add the script to save the
configuration. So here after configuring the

19

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loopback, let’s save the configuration
Here let’s add the command, do write.

20

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Change the interface, let’s configure
loopback3, the ip address is 10.4.1.x, save.

21

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Let’s execute the script again.

22

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Just enter enter here.

23

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Okay here we can see that we in router 1,
we success to save the configuration,

24

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but in router 2, we are not
success to save the configuration,

25

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router 3 success, router 4 success,
router 5 is also not success.

26

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This is because we forget to
use time sleep after do write.

27

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Let’s put time sleep here, let’s say
we will stop the program for 2 second.

28

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Save, execute the script again, enter enter here.

29

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Router 1 is success, so here configuring loopback,

30

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do write is success, and we can
see the result of show interface.

31

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router 2 is still failed to save the
configuration. Router 3 is also failed, router 4 is

32

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success, router 5 is also failed. And also the show
is not success. so the time sleep is not enough.

33

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Let’s edit the script again, let’s change
this become 3, and then in the show interface,

34

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let’s change this to 1, save, execute
the script again, enter enter here.

35

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Router 1 is success, router 2 is
success, router 3 is success,

36

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router4 is success,

37

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and router 5 is also success.

38

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Okay so now we are success
to save the configuration.

39

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Let’s check it, let’s say router 5, show
ip interface brief exclude unassign.

40

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Here we can see that we have loopback3,

41

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Shutdown the router, and then start again.

42

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Now let’s check the interface again, do
show ip interface brief exclude unassign.

43

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Here we can see that the loopback3 is still exist.

44

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Okay I think enough for this video.

45

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