Which process does a Junos device use to resolve routes learned from different protocols?

A Junos device uses route preference to determine which route will be installed in the routing table when multiple routes to the same destination are learned from different routing protocols. Each routing protocol has a predefined preference value, which indicates its reliability and desirability for the routing process.

When the device learns routes from various protocols, it evaluates the preference values assigned to those protocols. For example, OSPF might have a different preference than RIP, or a static route could be preferred over dynamic routes. The route with the highest preference will be selected and added to the routing table, ensuring that the most efficient and reliable path is chosen for forwarding packets.

This mechanism is essential in multi-protocol environments, enabling the device to manage and prioritize the information efficiently, thus facilitating optimal routing decisions while avoiding conflicts that might arise from learning multiple paths towards the same destination.