Complete Teaching of IS-IS by Arash Deljoo

Concepts , Configuration , Optimization

Ratings: 4.85 / 5.00




Description

The IS-IS (Intermediate System - Intermediate System) protocol is one of a family of IP Routing protocols, and is an Interior Gateway Protocol (IGP) for the Internet, used to distribute IP routing information throughout a single Autonomous System (AS) in an IP network.


IS-IS is a link-state routing protocol, which means that the routers exchange topology information with their nearest neighbors. The topology information is flooded throughout the AS, so that every router within the AS has a complete picture of the topology of the AS. This picture is then used to calculate end-to-end paths through the AS, normally using a variant of the Dijkstra algorithm. Therefore, in a link-state routing protocol, the next hop address to which data is forwarded is determined by choosing the best end-to-end path to the eventual destination.


The main advantage of a link state routing protocol is that the complete knowledge of topology allows routers to calculate routes that satisfy particular criteria. This can be useful for traffic engineering purposes, where routes can be constrained to meet particular quality of service requirements. The main disadvantage of a link state routing protocol is that it does not scale well as more routers are added to the routing domain. Increasing the number of routers increases the size and frequency of the topology updates, and also the length of time it takes to calculate end-to-end routes. This lack of scalability means that a link state routing protocol is unsuitable for routing across the Internet at large, which is the reason why IGPs only route traffic within a single AS.


IS-IS was originally devised as a routing protocol for CLNP, but has been extended to include IP routing; the extended version is sometimes referred to as Integrated IS-IS.

What You Will Learn!

  • The History of IS-IS
  • CLNP [ Connection Less Network Protocol ]
  • IS-IS Fundamentals
  • IS-IS Process and Terminology
  • IS-IS Basic Configuration , Verification
  • IS-IS Topology and Database Analyzing
  • IS-IS Neighborship Conditions
  • IS-IS Broadcast Network Type
  • IS-IS Operation Over Point-to-Point Links
  • IS-IS Operation Over Broadcast Links
  • IS-IS Propagating LSPs on a Point-to-Point Interface
  • IS-IS Propagating LSPs on a Broadcast Interface
  • IS-IS LSP , CSNP , PSNP Authentication
  • IS-IS Metric
  • IS-IS Equal Cost Multi Path [ECMP]
  • IS-IS Default Route Advertisement
  • IS-IS Summarization & Route-Leaking
  • IS-IS Optimization and Timers - SPF Interval
  • IS-IS Optimization and Timers - PRC Interval
  • IS-IS Optimization and Timers - LSP Generation Interval
  • IS-IS Optimization and Timers - LSP Interval
  • IS-IS Optimization and Timers - LSP Retransmit-Interval
  • IS-IS Optimization and Timers - LSP Retransmit-Throttle-Interval
  • IS-IS Optimization and Timers - LSP Refresh Interval
  • IS-IS Optimization and Timers - Max LSP Lifetime
  • IS-IS Optimization and Timers - CSNP Interval
  • IS-IS Optimization and Timers - Advertise Prefix
  • IS-IS Optimization and Timers - Advertise Passive Only
  • IS-IS Optimization and Timers - incremental SPF (iSPF)
  • IS-IS Optimization and Timers - Protocol Shutdown
  • IS-IS Optimization and Timers - LSP Full Suppress
  • IS-IS Optimization and Timers - Fast Flood
  • IS-IS Optimization and Timers - Hello Padding
  • IS-IS Optimization and Timers - Set-Attached-bit
  • IS-IS Optimization and Timers - Set-Overload-bit
  • IS-IS Optimization and Timers - Max Area Address
  • IS-IS Optimization and Timers - Tag
  • IS-IS IPv6 Routing - Single Topology vs Multi Topology
  • IS-IS - IS-IS Configuration in IOS-XR

Who Should Attend!

  • Enterprise Engineers , Service Provider Engineers , Data Center Engineers