Besides EIGRP, which other IGP supports unequal load-balancing?

Unequal load balancing refers to the ability of a routing protocol to distribute outbound traffic over multiple paths where the paths can have different metrics or costs. This is significant in optimizing bandwidth utilization across multiple routes, especially in scenarios where one route may be more efficient than another due to varying network conditions.

While EIGRP (Enhanced Interior Gateway Routing Protocol) is well-known for its support of unequal-cost load balancing through features such as the variance command, other interior gateway protocols (IGPs) like OSPF, RIP, and IS-IS do not support this feature.

OSPF (Open Shortest Path First) performs equal-cost load balancing, distributing traffic evenly across one or more paths if they share the same cost but does not handle unequal metrics. Similarly, RIP (Routing Information Protocol) only supports equal-cost load balancing as well, determining routing paths based entirely on lower hop counts and not considering other factors for differentiated bandwidth distribution. IS-IS (Intermediate System to Intermediate System) also adheres to similar principles, focusing primarily on equal-cost metric paths alone.

Consequently, the correct response recognizing that none of those protocols—besides EIGRP—support unequal load balancing is valid, leading to the conclusion that "None" is indeed the right