IS-IS is an interior gateway protocol that builds a topological representation of the network and supports routing between areas and routers. It is a link-state protocol that is similar to OSPF, with OSPF areas corresponding to IS-IS levels and OSPF neighbors mapping to IS-IS adjacencies. IS-IS was developed for OSI but can also carry IPv4 and IPv6.
![By SHUBHAM SAHRMA FINAL YEAR(CS) [email_address]](https://image.slidesharecdn.com/is-isroutingprotocol-100815014437-phpapp01/85/is-is-routing-protocol-1-320.jpg)
![IGP –> IS-IS ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)