(also Intermediate System-to-Intermediate System)
Intermediate System-to-Intermediate System (IS-IS) is a link-state routing protocol primarily used within large networks such as ISPs or enterprise networks. It enables routers to exchange routing information for the purpose of determining the most efficient path for forwarding packets across the network. IS-IS operates on the OSI model’s network layer (Layer 3) and is independent of any specific network protocol, making it highly adaptable to various network environments.
OSPF (Open Shortest Path First): OSPF is another widely used link-state routing protocol but operates solely on IP networks. While both IS-IS and OSPF provide efficient routing and fast convergence, IS-IS offers greater flexibility due to its network protocol independence.
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