Relationship between a secondary IP address and an OSPF IP address

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They are actually the same address. A secondary address is usually referred to as an OSFP IP address on the NMS.

Other related questions:
Can OSPF establish a neighbor relationship by using the secondary IP address
In OSPF, a neighbor relationship cannot be established by using the secondary IP address; instead, a neighbor relationship can be established only by using the primary address of an interface. If the network to which the secondary IP address belongs is added to the OSPF configuration, however, the corresponding route can be advertised.

Can CE series switches use their secondary IP addresses to establish an OSPF neighbor relationship
CE series switches cannot use secondary IP addresses to establish an OSPF neighbor relationship.

Relationship between the IP address and ID of an OTN NE
The ID of an OTN NE is unique in the entire network. When the NE is configured as the gateway NE, the NE uses the IP address for TCP/IP communication with the NMS. For other communications between NEs, the device uses the DCC communication with other devices, and the ID is the only identifier.

Can an AR allocate IP addresses based on secondary IP addresses
All AR models allocate IP addresses based on the primary IP address, regardless of whether the interface or global address pool is used. The AR cannot allocate IP addresses based on the secondary IP address, that is, user terminals cannot obtain IP addresses on the same network segment as the secondary IP address.

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