It's your job to fix the network.
So on router 3, show version,
notice the configuration register is set to this value on a very old router such as 2500 or 1600, the
routers used to have a mini operating system.
Modern day routers don't have that.
So that value is essentially irrelevant for a lot of modern-day routers.
So I'll set it to 0x2102,
so show version shows us what the configuration register will be at next
reload.
So reload,
don't want to save the configuration, press enter to confirm the reboot.
Let's see what happens.
Now, we're still getting issues where test.bin is not found.
Why is the router trying to load this test.bin file?
Why does it try and do that a few times and then boot with the default operating system?
So, again, why does it try and load this file, test.bin then eventually load this file?
So let's have a look.
Show run, can you see the problem?
Notice boot system flash test.bin.
Now, this is an issue in packet tracer where the command is shown twice.
But notice the router has been configured to boot off flash and to load the test.bin operating system,
DIR shows us the contents of flash.
This router has this operating system in Flash, that's the only binary file or operating system in
the flash of the router.
So this command doesn't make sense if we had an operating system in flash called test.bin the
router would be able to boot off that operating system
but it's not available in the flash of the router.
So the router has defaulted to using the first operating system found in flash.
This is the only operating system available.
So that's the one that's loaded.
We can see that by using the show version command.
Notice, this is the operating system that was booted, so that's the one that the router is using at
the moment.
So we need to get rid of this command.
So no boot system, flash, test.bin, do show run,
we still have that command once, do that again, on a real router
you shouldn't have to type it twice or multiple times, but show run now shows us that that command
is missing
but that doesn't really help us because the router doesn't have any configuration.
So if we rebooted the router now, it would load this configuration
but the router doesn't have any IP addresses and isn't configured with any protocols.
Show start shows us the startup configuration with the boot system command
but the router once again doesn't have any IP addresses configured and doesn't have a routing protocol
configured.
So how are we going to restore the configuration of router 3?
Did you notice that when I used the DIR command that a backup configuration is available in the flash of
the router?
Now, the more command allows you to read the contents of files in Flash, this is very similar to
the more command found in linux.
So more flash live config,
we are reading the contents
of this file in Flash.
Notice that command is found in the file, but we also see the loopback IP address and the IP address
of interface gigabit 0/0/0
and we see EIGRP.
Now, we've been told that we can't configure IP addresses manually or configure IGP, so I'm simply
going to copy the file from flash to the running configuration of the router.
Now I don't remember what the file name is, so DIR shows us that.
So do the command again.
File is a live config, destination filename is running configuration.
Notice the loopback interfaces come up.
So show IP interface brief.
We see the IP address of the loopback interface.
Notice, however, that this interface is still shut down.
When you do a restall like that, you need to no sh4 interfaces
and we can see now that EIGRP has formed a neighbor relationship, so show IP interface, brief interfaces
are up up, show IP protocols
we are using EIGRP.
Show, IP EIGRP neighbors, we've got a neighbor relationship, show IP route we've learnt
various routes, including the loopback of router 1 and the loopback of router 2, so router 3 can ping
both loopback of router 1 and the loopback of router 2, router 2 should hopefully be able to ping
the loopback of router 1 and the loopback of router
3 which it can
and router 1 should be able to ping itself,
loopback of router 2 and loopback of router 3, so that all works, looks good.
We now need to fix this issue once again because we restored this configuration
it did emerge so that command needs to be removed again.
When you copy files into running configuration, it does emerge missing commands are added back.
So we need to remove that, show
run shows us the running configuration,
that all looks good.
Now, the startup configuration on this router is incorrect.
So I'm going to save the configuration by using WR, in the exam you would use the command copy running
config, startup-config. So show startup-config again we can see a proper startup configuration.
So that all looks good
but we need to verify this by power cycling devices, so I'm going to click power cycle devices, say
yes.
Here's router 2 booting its operating system,
router 1 booting its operating system,
router 3 booting its operating system.
It's not complaining about test.bin not being found, so router 3 is booted up successfully.
router 1 is booted up successfully, router 2 is booted up successfully, and we can verify things
again. On router 2 can we ping the loopback of router 1?
Yes, we can.
Can we ping our local loopback?
Yes we can.
Can we ping the loopback of router 3?
Yes, we can.
On router 3, can we ping the loopback of router 1,
loopback of router 2 and ourselves?
Yes we can.
So I'm happy with that.
We've successfully restored the configurations of the devices.
Network is working, customers are happy and you are a hero.
Well, at least for the next five minutes until users complain about something else.
So how did you do with the lab?
Were you able to get it working?
Make sure that you understand configuration register values for the CCNA exam.