Which command is used to enable association between BFD and OSPF on all interfaces?

The command used to enable association between Bidirectional Forwarding Detection (BFD) and Open Shortest Path First (OSPF) on all interfaces is "bfd all-interface enable." This command is designed specifically to activate BFD globally across all interfaces on a router, which allows BFD to monitor the OSPF session health effectively. By enabling this association, BFD can provide fast failure detection for OSPF neighbors, enhancing the responsiveness of the routing protocol in the event of link failures.

BFD is a critical protocol used to detect faults in the path between two forwarding engines, and integrating it with OSPF improves the overall network stability and reliability. When this command is applied, it ensures that all supported interfaces will participate in the BFD process, which is essential for timely updates to OSPF routing decisions based on the health of the links.

The other options either do not apply correctly to the context of enabling BFD with OSPF globally or have incorrect syntax that would prevent proper execution in a router environment. Therefore, "bfd all-interface enable" is the correct command to initiate BFD for OSPF on all interfaces.