Learn more about ROA, or Route Origin Authorization.
What is Route Origin Authorization?
Route Origin Authorization, or ROA for short, is a cryptographically signed object. The purpose of this object is to declare which Autonomous System is authorized to originate a certain prefix.
ROA consist of these components
ASN (Autonomous System Number)
IP address or prefix
Maximum length of prefix
Maximum length of prefix indicates the length of the most specific IP prefix that the Autonomous System can advertise. If the maximum length is not specified, the AS can only advertise the specified prefix. In this case, more specific advertisements are invalid. This is set in place to prevent IP hijacking.