Which of the following statements regarding OSPF multi-instance is false?

Which of the following statements regarding OSPF multi-instance is false?

• A. OSPF multi-instance takes effect globally.
• B. An interface of a router belongs to only a certain OSPF process.
• C. Route exchange between different OSPF processes is similar to route exchange between different routing protocols.
• D. Multiple OSPF processes can run on the same router, and they are independent of each other.

Answer: (A)

The statement "OSPF multi-instance takes effect globally" is false because OSPF multi-instance is designed to allow multiple, independent OSPF processes to run on the same router, each with its own routing table and configuration. Instead of being applied globally across all interfaces of the router, each OSPF instance is associated with specific interfaces, allowing greater flexibility and control over routing behavior. In contrast, when an interface belongs to a specific OSPF process, it means that the routing decisions and advertisements for that interface are managed exclusively within that process. This localized processing ensures that routing can be customized for various segments of the network, aligning with different administrative needs or policies. Route exchange between different OSPF processes mimics the route exchange between different routing protocols, meaning that these OSPF processes do not share information natively, but rather must explicitly redistribute routes between them if necessary. This characteristic underlines the independence of OSPF processes in a multi-instance setup and emphasizes the need for carefully managing route distribution across these boundaries. Finally, the capability for multiple OSPF processes to operate independently on the same router is a core feature of OSPF multi-instance, enabling robust design options tailored to diverse network architectures.

The statement "OSPF multi-instance takes effect globally" is false because OSPF multi-instance is designed to allow multiple, independent OSPF processes to run on the same router, each with its own routing table and configuration. Instead of being applied globally across all interfaces of the router, each OSPF instance is associated with specific interfaces, allowing greater flexibility and control over routing behavior.

In contrast, when an interface belongs to a specific OSPF process, it means that the routing decisions and advertisements for that interface are managed exclusively within that process. This localized processing ensures that routing can be customized for various segments of the network, aligning with different administrative needs or policies.

Route exchange between different OSPF processes mimics the route exchange between different routing protocols, meaning that these OSPF processes do not share information natively, but rather must explicitly redistribute routes between them if necessary. This characteristic underlines the independence of OSPF processes in a multi-instance setup and emphasizes the need for carefully managing route distribution across these boundaries.

Finally, the capability for multiple OSPF processes to operate independently on the same router is a core feature of OSPF multi-instance, enabling robust design options tailored to diverse network architectures.