Differences between interface authentication and area authentication for OSPF on S series switches

Rules for OSPF authentication on S series switches supporting OSPF are as follows:
If an interface is configured with authentication, the authentication method configured on the interface is used. If the authentication is set to null, the interface is not authenticated. If the interface is not configured with authentication (null does not indicate no configuration), area authentication is used. If the area is not configured with authentication either, no authentication is performed.

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