BGP Path Attributes: Origin Type

Following AS Path, origin type is evaluated next in the order of preference.

The BGP attribute is well-known and is known simply as ‘origin’.

Origin defines where networks originated from, how they were advertised into BGP. Networks that were advertised into BGP via a network statement in the BGP configuration are given an ‘i’ indicator, or IGP.

Redistributed networks are assigned an Incomplete, or ‘?’ indicator.

The order of preference for origin are:

1. IGP Origin
2. EGP Origin
3. Incomplete or Unknown Origin