MLS switch may not have IP set up on interfaces but it should have IPs on SVIs.
simplest command for all interfaces (in case of switch SVIs) is like
router ospf 1
router-id x.x.x.x
network 0.0.0.0 255.255.255.255 area 0 <this enables ospf for all interfaces set with IPs, otherwise, choose yours.
PT was shared in your other post.
Regards, ML
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