This course help you to know ISISprotocol the most used in service provider also most used with MPLSprotocol

and TE engineering . This course not include in CCNA and CCNPEnterprise course but you find it in service provider track . now you can learn with me step by step to understand well ISIS routing protocol or intermediate system to intermediate system routing protocol # # ## ### ##### ####### ######### ########## ########### ############ ################ ###################### ####################### ############### ######## ############ ############# ############## ################ #############################################################################################################################################################3

Requirements of this course know OSPFprotocol or IGP protocol in CCNAcourse

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IS-IS is an interior gateway protocol, designed for use within an administrative domain or network. This is in contrast to exterior gateway protocols, primarily Border Gateway Protocol (BGP), which is used for routing between autonomous systems

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IS-IS is a link-state routing protocol, operating by reliably flooding link state information throughout a network of routers. Each IS-IS router independently builds a database of the network's topology, aggregating the flooded network information. Like the OSPF protocol, IS-IS uses Dijkstra's algorithm for computing the best path through the network. Packets (datagrams) are then forwarded, based on the computed ideal path, through the network to the destination

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he IS-IS protocol was developed by a team of people working at Digital Equipment Corporation as part of DECnet Phase V. It was standardized by the ISO in 1992 as ISO 10589 for communication between network devices that are termed Intermediate Systems (as opposed to end systems or hosts) by the ISO. The purpose of IS-IS was to make possible the routing of datagrams using the ISO-developed OSI protocol stack called CLNS.

IS-IS was developed at roughly the same time that the Internet Engineering Task Force IETF was developing a similar protocol called OSPF. IS-IS was later extended to support routing of datagrams in the Internet Protocol (IP), the Network Layer protocol of the global Internet. This version of the IS-IS routing protocol was then called Integrated IS-IS