How to redistribute OSPF routes into BGP on Cisco routers

Route redistribution is used to propagate routes learned using one protocol into another routing protocol.

Redistribution of dynamically learned Interior Gateway Protocol (IGP) routes into Border Gateway Protocol (BGP) is not recommended.

When Open Shortest Path First (OSPF) is redistributed into Border Gateway Protocol (BGP), only the inter-area and intra-area routes get redistributed.

Issuing the redistribute command by itself does not result in redistribution of OSPF external or Not-So-Stubby Area (NSSA) external routes into BGP.

To redistribute OSPF external routes into BGP, issue the redistribute command with the external keyword in router configuration mode.

To redistribute OSPF NSSA-external routes into BGP, issue the redistribute command with the NSSA-external keyword in router configuration mode.

For more information refer to:

Understanding Redistribution of OSPF Routes into BGP

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