Route Import

BGP itself cannot discover routes. It needs to import other protocol routes, such as IGP or static routes to the BGP routing table. In this manner, imported routes can be transmitted within an AS or between ASs.

BGP can import routes in either Import mode or Network mode.

• In Import mode, BGP imports routes according to protocol types, for example, Routing Information Protocol (RIP) routes, Open Shortest Path First (OSPF) routes, Intermediate System-to-Intermediate System (IS-IS) routes, static routes, or direct routes.
• The Network mode is more precise than the Import mode. In Network mode, routes with the specified prefix and mask are imported to the BGP routing table.