Hello Nagarajan
The max-metric router-lsa command causes an OSPF router to advertise its locally generated router LSAs with a maximum metric. This causes other routers to prefer an alternate path for these destinations (if one exists) rather than routing traffic through this router. The purpose of this is to avoid routing transit traffic if there are alternate paths.
Transit traffic is traffic with a source and destination that are both on “other networks” and not on a locally administrated network. Transit traffic is undesirable because you are routing traffic where both the source and the destination are not under your jurisdiction. In other words, you’re routing someone else’s traffic.
More information about this feature can be found here:
I hope this has been helpful!
Laz