Which BGP attribute is preferred when a path is originated by the local router?

The attribute that indicates a path is originated by the local router is known as the Origin Code. This attribute specifically marks routes that are originated from inside the local autonomous system. Understanding its purpose is crucial because it plays a role in determining the preferred path when multiple routes are available.

In BGP, the Origin Code has three possible values: IGP (Interior Gateway Protocol), EGP (Exterior Gateway Protocol), and incomplete. When paths are learned or originated from within the local AS, they are marked with the IGP value. This makes the Origin Code more favorable compared to paths derived from other sources when BGP makes routing decisions.

The Origin Code must be recognized because it directly influences the decision-making process of BGP, and routes originating from the local router typically have a higher preference. The path selection process evaluates various attributes, but the Origin Code directly indicates the source of the route, which is crucial for establishing the most reliable and preferred paths within BGP routing.