Assign interfaces to the IS-IS instance.IS-IS also uses an area concept however, IS-IS defines two area types:Ī Level 1 router establishes adjacencies with other Level 1 routers within a local area ( intra-area routing)Ī Level 2 router builds adjacencies to other Level 2 routers and routes between different Level 1 areas ( inter-area routing) Sample IS-IS topology showing L2 / L1 router types and areas It uses information from this database to calculate the best, loop-free path to other devices on the network. Like OSPF, IS-IS is a link-state routing protocol that uses a link state database that describes the state of the network. IS-IS is an Interior Gateway Protocol (IGP) based on Standardization (ISO)/International Engineering Consortium (IEC) 10589. Outside of DC/Nexus, this is a recommended underlay choice for Cisco SD-Access, comes up as a concept (no configuration) in FabricPath and also comes up in Cisco DC study material. what I really want to cover here is IS-IS.
Of course Nexus supports the standard Layer 3 features you would expect:
