The OSPF Domain ID Table. The OSPF Domain ID Table controls the LSA types assigned to BGP/MPLS IP VPN routes as part of OSPF PE-CE protocol function. This table is only used if ospfPmEntVpnPeCeSupport is true. The OSPF Domain ID Table specifies one primary OSPF Domain ID and optionally one or more secondary OSPF Domain IDs. When an OSPF instance exports an OSPF route as a BGP/MPLS VPN route, it adds attributes including the OSPF Route Type and the OSPF Domain ID, and sets the route's OSPF Domain ID to the exporting OSPF Instance's primary OSPF Domain ID. When another OSPF instance imports the BGP/MPLS VPN route as an OSPF route, it determines the route's LSA type according to its OSPF Route Type and OSPF Domain ID. - If the VPN route's OSPF Route Type is AS-external then the route is imported as an AS-external route. - If the VPN route's OSPF Domain ID doesn't match any of the OSPF instance's primary or secondary OSPF Domain IDs then the route is imported as an AS-external route. - Otherwise the VPN route is imported as an OSPF inter-area route. If the OSPF Domain ID Table is empty then the primary OSPF Domain ID is the NULL OSPF Domain ID. If ospfPmEntVpnPeCeSupport is false then RFC 4577 OSPF PE-CE function is disabled. In this case VPN routes are exported without OSPF Route Type and OSPF Domain ID attributes, and are imported as AS-external routes.