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IS-IS Crash Course (Updated 2025): Concepts & Configuration
Rating: 4.3 out of 5(34 ratings)
3,987 students

IS-IS Crash Course (Updated 2025): Concepts & Configuration

How to configure IS-IS for IPv4 and IPv6 networks with different areas and levels
Created byMohammad Imani
Last updated 12/2024
English
English [Auto],

What you'll learn

  • Understand the core concepts of IS-IS protocol
  • Configure IS-IS protocol in their network with different areas and levels
  • Configure IS-IS on IOS and IOS-XR routers

Course content

5 sections • 18 lectures • 3h 40m total length

  • Basic IS-IS Config on IOS XR17:22

    Configure a basic isis network on ios xr by defining a backbone area, area id, and net values; enable isis on ipv4 unicast interfaces (level two) and verify adjacencies.

  • Configuring Other Areas10:30

    Configure the IS-IS process for area 11, assign interfaces to the ISIS network, set point-to-point links, and mark loopback as passive to manage L1/L2 adjacencies and database size.

  • Configuring L1 Routers16:00

    Configure ISIS in a mixed L1/L2 setup, exploring inter-area vs intra-area adjacencies, backbone area behavior, attached bits, and default routing with R5, R6, and R7.

  • Design Considerations for the Backbone Area19:26

    Explore IS-IS backbone design, ensuring the backbone runs at level 2 for full adjacency. Configure L1/L2 routers, test connectivity, and understand database and domain boundaries.

  • Route Leaking7:34

    Demonstrates route leaking in ISIS by redistributing selected level-2 routes into level-1 using a prefix list and route map, enabling traffic engineering with explicit exit points.

  • Metric Configuration13:55

    Discover two methods to configure IS-IS metrics, including narrow and wide metric styles, and apply them under the ISIS process for IPv4 unicast, with limits like 10 and 63.

  • Authentication5:55

    Learn how to configure IS-IS authentication across routers and interfaces, using LSP passwords, MD5 keys, and keychains on both iOS and XR platforms, with practical debugging tips.

  • Configure IPv617:50

    Enable IPv6 ISIS on IOS and XR by configuring interfaces and loopbacks with IPv6 unicast, and apply multi topology for separate IPv6 SPF calculations.

  • Mesh Groups, BFD, Fast Reroute18:53

    Configure mesh groups to reduce ISIS LSP flooding, enable BFD for reliable neighbor reachability, and deploy fast reroute to provide dual-path traffic protection.

  • Summary Address12:37

    Explore how to configure isis summary addresses and overload bits to control route advertisement and traffic during reloads, while applying loopback interfaces and level two summarization in an isis network.

Requirements

  • Basic Knowledge About Using IGP Protocols
  • If Not On Real Gear, Using GNS3

Description

Master IS-IS in Minutes: Your Ultimate Crash Course

Are you ready to unlock the power of Interior Gateway Protocol (IS-IS)? This comprehensive crash course is designed to equip you with the essential knowledge and skills to master this advanced routing protocol.

Whether you're a seasoned network engineer looking to refine your expertise or a networking student eager to dive into the world of routing, this course is your perfect companion.

In this fast-paced course, you'll learn:

  • IS-IS Fundamentals: Grasp the core concepts, terminology, and the role of IS-IS in modern network infrastructures. Understand how IS-IS differs from other routing protocols like OSPF and RIP.

  • IS-IS Operation: Delve into the inner workings of IS-IS, including packet formats, routing processes, and neighbor discovery. Learn how IS-IS builds and maintains its topology database.

  • IS-IS Configuration: Gain hands-on experience with configuring IS-IS on popular networking devices like Cisco and Juniper. Master the art of configuring IS-IS levels, areas, and redistribution.

  • Troubleshooting IS-IS: Develop the skills to troubleshoot common IS-IS issues, from convergence problems to specific error messages. Learn how to analyze IS-IS logs and debug IS-IS configurations.

  • Advanced IS-IS Topics: Explore advanced topics like IS-IS security, load balancing, and performance tuning.

By the end of this course, you'll be able to:

  • Design and implement robust IS-IS networks

  • Troubleshoot and optimize IS-IS networks

  • Configure IS-IS on various networking devices

  • Stay ahead of the curve in the ever-evolving world of network engineering

Join us on this accelerated journey and become an IS-IS expert. Don't miss this opportunity to supercharge your networking career!

Who this course is for:

  • CCNP R&S and SP Students
  • CCIE R&S and SP Students
  • Network Admins and Engineers who wish to employ IS-IS in their network

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