I've read that if the "boot system" commands are not found in the startup-config file, the router can look for an IOS image in flash, and if it's not there, then the router will try to get the IOS image from a TFTP server. So does the router use bootp, rarp or dhcp to connect to the TFTP server?
It basically says Are there boot system commands in the config file? ---> No ---> Is there a valid image in the default Flash device? ---> No ---> The router tries to boot from the network using the default image name.
So, I'm just asking how the router gets to the TFTP server if there are no boot system commands in the config file and there's no IOS in flash? Thanks!
Suppose the 3 boot system commands (flash, tftp and rom) were in the config file, and the router rebooted normally because the IOS was in flash. Suppose now someone accidentally removes the IOS from flash, and also the boot system commands from the config, saves it to startup config, and reloads the router. So you are saying the router will try to look for a TFTP server, because it was configured to do so in the past? Do you know if the config register 0x2124 is of any importance?
I have seen a screen output example on the web where someone removed the flash IOS and removed his boot system lines, the router reboots, asks him to enter an IP address for an interface, and the router finds the TFTP server and grabs the IOS image.
not sure if that is what you mean, but if you would remove the IOS from flash, the router would boot into ROMMON anyway, and you would have to manually load an IOS before the router could attempt to look anywhere for a valid configuration file. Do you have the URL of the screen output you are referring to ?
What do you think about the first Cisco link I posted? Do you think the flow chart is in error? I also have a Cisco textbook that says the same thing. "if no boot system commands, and if no IOS in flash, router goes to TFTP..."
I also wonder what 0x2124 does? There's not much about it on the net, except for a Cisco page that mentions "netboot". Don't know if that is significant.
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.