Can I specify an authentication domain on an interface of an S series switch

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You can specify a user authentication domain (the default domain) on an interface of an S series switch (a non-S1700 switch) running V200R005 or a later version. The switch then can assign a user who does not provide the domain name when being authenticated to the specified authentication domain for authentication.

Other related questions:
Can I configure OSPF authentication on an interface of an S series switch
Two S series switches supporting OSPF can only use primary interface IP addresses to establish an OSPF adjacency relationship. If secondary interface IP addresses are added to the OSPF configuration, corresponding routes can be advertised.

Rate limit for DHCP packets on specified interfaces of S series switch
For S series switches in V100R006 and later versions, only the S3728 in S3700 series switches supports the interface-based rate limit for DHCP packets.

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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