During the boot ios we found the error messages below. How can i clear this messages?
Missing or illegal ip address for variable DEFAULT_GATEWAY Using midplane macaddr
Missing or illegal ip address for variable IP_ADDRESS
Missing or illegal ip address for variable IP_SUBNET_MASK
Those messages will not cause any harm. Based on their nature, they should be cleared if you set the parameters for booting from TFTP server in Rommon but I have not done it yet myself.
If you are still interested, this link explains how it is configured and how the boot would look like on an ASR:
I could not find a way to configure them from CLI and I do not think that going into rommon is really worth the effort just so that those messages disappear.