Autonomous system boundary router (ASBR)
This type of OSPF router runs multiple interior gateway protocols and serves as a gateway to other autonomous systems operating with interior gateway protocols. The ASBR imports and translates different protocol routes into OSPF through redistribution. ASBRs can be used in backbone areas, normal areas, and NSSAs, but not in stub areas. For more details on redistribution and configuration examples, see Enabling route redistribution.