How does an S series switch hide an OSPF route so that the route is not advertised to any other area

Question: How to hide an OSPF route so that it is not advertised to any other area?
Answer: A filter list on an S series switch supporting OSPF cannot prevent a route from being advertised. You can use either of the following methods:
Configure route summarization on an ABR and specify the keyword no-advertise in the command.
Configure an ABR to filter the routes carried in Type 3 LSAs. The ABR filters routes when advertising Type 3 LSAs between OSPF areas. Only the packets with prefixes meeting requirements can be transmitted from one area to another. In this way, the incoming and outgoing packets of an area are controlled.

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