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It's your job to fix the network.

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So on router 3, show version, 

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notice the configuration register is set to this value on a very old router such as 2500 or 1600, the

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routers used to have a mini operating system.

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Modern day routers don't have that.

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So that value is essentially irrelevant for a lot of modern-day routers.

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So I'll set it to 0x2102,

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so show version shows us what the configuration register will be at next

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reload.

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So reload, 

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don't want to save the configuration, press enter to confirm the reboot.

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Let's see what happens.

13
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Now, we're still getting issues where test.bin is not found.

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Why is the router trying to load this test.bin file?

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Why does it try and do that a few times and then boot with the default operating system?

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So, again, why does it try and load this file, test.bin then eventually load this file?

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So let's have a look.

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Show run, can you see the problem?

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Notice boot system flash test.bin. 

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Now, this is an issue in packet tracer where the command is shown twice.

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But notice the router has been configured to boot off flash and to load the test.bin operating system,

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DIR shows us the contents of flash.

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This router has this operating system in Flash, that's the only binary file or operating system in

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the flash of the router.

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So this command doesn't make sense if we had an operating system in flash called test.bin the

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router would be able to boot off that operating system

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but it's not available in the flash of the router.

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So the router has defaulted to using the first operating system found in flash.

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This is the only operating system available.

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So that's the one that's loaded.

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We can see that by using the show version command.

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Notice, this is the operating system that was booted, so that's the one that the router is using at

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the moment.

34
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So we need to get rid of this command.

35
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So no boot system, flash, test.bin, do show run, 

36
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we still have that command once, do that again, on a real router

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you shouldn't have to type it twice or multiple times, but show run now shows us that that command

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is missing

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but that doesn't really help us because the router doesn't have any configuration.

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So if we rebooted the router now, it would load this configuration

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but the router doesn't have any IP addresses and isn't configured with any protocols.

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Show start shows us the startup configuration with the boot system command

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but the router once again doesn't have any IP addresses configured and doesn't have a routing protocol

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configured.

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So how are we going to restore the configuration of router 3?

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Did you notice that when I used the DIR command that a backup configuration is available in the flash of

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the router?

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Now, the more command allows you to read the contents of files in Flash, this is very similar to

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the more command found in linux.

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So more flash live config,

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we are reading the contents

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of this file in Flash.

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Notice that command is found in the file, but we also see the loopback IP address and the IP address

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of interface gigabit 0/0/0

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and we see EIGRP.

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Now, we've been told that we can't configure IP addresses manually or configure IGP, so I'm simply

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going to copy the file from flash to the running configuration of the router.

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Now I don't remember what the file name is, so DIR shows us that.

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So do the command again.

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File is a live config, destination filename is running configuration.

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Notice the loopback interfaces come up.

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So show IP interface brief.

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We see the IP address of the loopback interface.

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Notice, however, that this interface is still shut down.

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When you do a restall like that, you need to no sh4 interfaces

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and we can see now that EIGRP has formed a neighbor relationship, so show IP interface, brief interfaces

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are up up, show IP protocols

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we are using EIGRP.

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Show, IP EIGRP neighbors, we've got a neighbor relationship, show IP route we've learnt 

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various routes, including the loopback of router 1 and the loopback of router 2, so router 3 can ping

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both loopback of router 1 and the loopback of router 2, router 2 should hopefully be able to ping

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the loopback of router 1 and the loopback of router

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3 which it can

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and router 1 should be able to ping itself,

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loopback of router 2 and loopback of router 3, so that all works, looks good.

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We now need to fix this issue once again because we restored this configuration

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it did emerge so that command needs to be removed again.

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When you copy files into running configuration, it does emerge missing commands are added back.

79
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So we need to remove that, show

80
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run shows us the running configuration, 

81
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that all looks good.

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Now, the startup configuration on this router is incorrect.

83
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So I'm going to save the configuration by using WR, in the exam you would use the command copy running

84
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config, startup-config. So show startup-config again we can see a proper startup configuration.

85
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So that all looks good

86
00:07:56,350 --> 00:08:05,080
but we need to verify this by power cycling devices, so I'm going to click power cycle devices, say

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yes.

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Here's router 2 booting its operating system,

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router 1 booting its operating system, 

90
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router 3 booting its operating system.

91
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It's not complaining about test.bin not being found, so router 3 is booted up successfully.

92
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router 1 is booted up successfully, router 2 is booted up successfully, and we can verify things

93
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again. On router 2 can we ping the loopback of router 1?

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Yes, we can.

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Can we ping our local loopback?

96
00:08:46,130 --> 00:08:47,030
Yes we can.

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Can we ping the loopback of router 3?

98
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Yes, we can.

99
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On router 3, can we ping the loopback of router 1,

100
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loopback of router 2 and ourselves?

101
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Yes we can.

102
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So I'm happy with that.

103
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We've successfully restored the configurations of the devices.

104
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Network is working, customers are happy and you are a hero.

105
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Well, at least for the next five minutes until users complain about something else.

106
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So how did you do with the lab?

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Were you able to get it working?

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Make sure that you understand configuration register values for the CCNA exam.