Differences between CSPF and OSPF

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OSPF is a routing protocol that calculates the control route and floods service route information.
Constraint Shortest Path First (CSPF) is an algorithm for calculating service routes and is usually referred to as the CSPF module.

Other related questions:
Relationship between a secondary IP address and an OSPF IP address
They are actually the same address. A secondary address is usually referred to as an OSFP IP address on the NMS.

Can an OSPF neighbor relationship be established between devices that are on different subnets
A neighbor relationship can be established between two routers that are not on the same subnet only when the devices are connected through point-to-point (P2P) links. On a Point-to-Multipoint (P2MP) network, you can determine whether adjacencies can be formed between neighbors that are not on the same subnet. In all other cases, the devices must be on the same subnet.

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.

Reason why CSPF is used on ASON networks
Constraint Shortest Path First (CSPF) is a routing algorithm that calculates the optimal route for a service, ensuring that the service is quickly restored after rerouting.

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