What Is Is-Is Protocol?
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IS-IS (Intermediate System-to-Intermediate System) is a link-state routing protocol standardised by the IETF and used in large service provider networks. It is used to construct routing tables and exchange network topology information between routers. IS-IS is similar to OSPF in that it is a link-state protocol, but differs from OSPF in that it was designed for large networks and is more scalable. IS-IS is used in large enterprise networks and is the basis for the routing protocol for services such as MPLS (Multiprotocol Label Switching).
Is–Is (Intermediate System to Intermediate System) is a routing protocol used by network devices (routers) to exchange routing information across LANs or WANs. It is used in large networks and based on the OSI (Open Systems Interconnection) reference model. Is–Is works by exchanging routing update packets between systems on a network, which allows them to build a map of the network and calculate the shortest path between two points on the network. Is–Is is primarily used as an Interior Gateway Protocol or IGP in large corporate networks.