Why is an OSPF route on an S series switch in the Invalid Adv state

Question: Why is an OSPF route in the Invalid Adv state?

Answer: After you run the display ip routing-table x.x.x.x verbose command on an S series switch supporting OSPF to check information about a specified route, you may find that Invalid Adv is displayed in the State field. Possible causes are as follows:
A route with a smaller preference value, for example, a directly connected route, exists.
The route is filtered out based on a filter policy.
A sham link is configured on the outbound interface.

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