0 ORIGIN ATTRIBUTETHE ORIGIN IS A MANDATORY ATTRIBUTE THAT DEFINES...

11.0 Origin Attribute

The origin is a mandatory attribute that defines the origin of the path

information. The origin attribute can assume three values:

IGP: Network Layer Reachability Information (NLRI) is interior to the

originating AS. This normally happens when we use the bgp network command

or when IGP is redistributed into BGP, then the origin of the path info

will be IGP. This is indicated with an “i” in the BGP table.

EGP: NLRI is learned via EGP (Exterior Gateway Protocol). This is

indicated with an “e” in the BGP table.

INCOMPLETE: NLRI is unknown or learned via some other means. This usually

occurs when we redistribute a static route into BGP and the origin of the

route will be incomplete. This is indicated with an “?” in the BGP table.

Example: