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Most Complete Teaching of IS-IS by Arash Deljoo
Rating: 4.7 out of 5(138 ratings)
879 students

Most Complete Teaching of IS-IS by Arash Deljoo

Master IS-IS Routing with Hands-On Labs, Packet Analysis, and Real Network Design Skills
Created byArash Deljoo
Last updated 11/2025
English
English [Auto],

What you'll learn

  • Master IS-IS from the ground up and finally understand how this powerful SP-grade routing protocol really works.
  • Build and troubleshoot IS-IS adjacencies like a pro on any network topology.
  • Decode IS-IS packets and databases, giving you true engineer-level visibility into routing behavior.
  • Optimize convergence and stability using advanced IS-IS timers and performance techniques.
  • Control routing with confidence using summarization, default routes, route leaking, metrics, and ECMP.
  • Tweak and fine-tune IS-IS flooding, LSPs, and SPF for maximum efficiency in large-scale networks.
  • Secure and harden IS-IS adjacencies with authentication and protocol protection methods.
  • Design IPv4/IPv6 topologies using Single and Multi-Topology IS-IS.
  • Configure IS-IS on Cisco IOS XR, giving you service-provider-grade real-world skills.
  • Design scalable, modern network architectures using IS-IS best practices used by top service providers.

Course content

6 sections • 50 lectures • 21h 41m total length

  • Evolution of Network Architectures and IS-IS Fundamentals56:48

    1- Traditional TCP/IP vs Updated TCP/IP

    2- OSI [Open System Interconnection] Practical Model

    3- History of IS-IS ( ISO 10589 )

    4- Integrated IS-IS or Dual IS-IS

    5- OSI vs TCP/IP Terminology

    6- ES,IS,Domain,Circuit,ISO IGRP,IDRP Terms

  • Evolution of Network Architectures and IS-IS Fundamentals Quiz
  • CLNP Structure and OSI Address Components56:58

    1- CLNP [ Connection Less Network Protocol ] Usage

    2- CLNP [ Connection Less Network Protocol ] Components

    3- IDP  [ Initial Domain Part  ] Usage

    4- DSP  [ Domain Specific Part ] Usage

    5- AFI  [ Authority and Format Identifier ] Usage

    6- IDI  [ Initial Domain Identifier       ] Usage

    7- HO-DSP [ High Order Domain Specific Part ] Usage

    8- NSAP [ Network Service Access Point ] Introduction

  • CLNP Structure and OSI Address Components Quiz
  • OSI and TCP IP Terminology and IS-IS Hello Messages33:18

    1- OSI vs TCP/IP Terms

    2- End System Hello [ESH] Usage

    3- Intermediate System Hello [ISH] Usage

    4- IS-IS Hello [IIH] Usage

    5- AFI  [ Authority and Format Identifier ] Usage

    6- IDI  [ Initial Domain Identifier       ] Usage

    7- HO-DSP [ High Order Domain Specific Part ] Usage

    8- Routing Protocols ( IGP , EGP )

    9- Routing Levels ( 0,1,2,3 )

  • OSI and TCP IP Terminology and IS-IS Hello Messages Quiz
  • IS-IS Levels , NET Addressing and Area Forwarding50:15

    1- IS-IS Router Types - Level-1 , Level-1-2 , Level-2-only Introduction

    2- NET[Network Entity Title] Address Design Requirement

    3- ATT[ATTachment bit] Function

    4- Level-1 Database Function

    5- Level-2 Database Function

    6- Difference between Topology and Database

    7- Follow the Packet inside of Area

    8- Follow the Packet between Areas

  • IS-IS Levels , NET Addressing and Area Forwarding Quiz
  • IS-IS Level 1 Area Operation and Validation11:31

    1- IS-IS Single Level-1 Area introduction

    2- IS-IS Single Level-1 Area configuration

    3- IS-IS Single Level-1 Area verification

  • IS-IS Level 1 Area Operation and Validation Quiz
  • IS-IS Broadcast Network Operation and Validation7:47

    1- IS-IS Broadcast Network introduction

    2- IS-IS Broadcast Network configuration

    3- IS-IS Broadcast Network verification

  • IS-IS Broadcast Network Operation and Validation Quiz
  • IS-IS Level 2 Only Router Operation and Validation9:16

    1- IS-IS Level-2-Only Routers introduction

    2- IS-IS Level-2-Only Routers configuration

    3- IS-IS Level-2-Only Routers verification

  • IS-IS Level 2 Only Router Operation and Validation Quiz
  • IS-IS Level 1 Level 2 and Level 1 2 Router Operation and Validation18:38

    1- IS-IS Level-1 and Level-2 and Level 1-2 Routers introduction

    2- IS-IS Level-1 and Level-2 and Level 1-2 Routers configuration

    3- IS-IS Level-1 and Level-2 and Level 1-2 Routers verification

  • IS-IS Level 1 Level 2 and Level 1 2 Router Operation and Validation Quiz
  • IS-IS Basic Configuration Verification and Multi Level Routing1:08:06

    1- IS-IS Router Types - Level-1 , Level-1-2 , Level-2-only Introduction

    2- NET[Network Entity Title] Address Design Requirement

    3- ATT[ATTachment bit] Function

    4- Level-1 Database Function

    5- Level-2 Database Function

    6- Difference between Topology and Database

    7- Follow the Packet inside of Area

    8- Follow the Packet between Areas

  • IS-IS Basic Configuration Verification and Multi Level Routing Quiz
  • IS-IS Topology and Database Analysis56:21

    1- IS-IS Topology Table [Level-1, Level-2]

    2- IS-IS Database LSDB  [Level-1, Level-2]

    3- Dynamic System-ID to Hostname Resolution

    4- NLPID Introduction

    5- Overload bit Introduction

    6- Partition bit Introduction

    7- LSP-ID Introduction

  • IS-IS Topology and Database Analysis Quiz
  • IS-IS Adjacency Behavior and Hello Packet Operations1:08:36

    1- IS-IS Adjacency States [ Down | Init | Up ]

    2- IS-IS Hello Packet Introduction

    3- IS-IS Hello Packet Interval & Multiplier Configuration

    4- IS-IS Neighborship Condition - Router Type States

    5- IS-IS Neighborship Condition - System ID States

  • IS-IS Adjacency Behavior and Hello Packet Operations Quiz
  • IS-IS Authentication Methods and Adjacency Troubleshooting41:50

    1- IS-IS Neighborship Condition about Subnet of Interfaces

    2- IS-IS Hello Authentication Introduction

    3- IS-IS Clear-Text Hello Authentication Configuration with Old-Style

    4- IS-IS Clear-Text Hello Authentication Configuration with New-Style

    5- IS-IS MD5 Hello Authentication Configuration with New-Style

    6- IS-IS debugging for Adjacency

  • IS-IS Authentication Methods and Adjacency Troubleshooting Quiz
  • IS-IS Behavior on Point to Point Network Types48:19

    1- IS-IS Local Circuit-ID Introduction

    2- IS-IS Extended Local Circuit-ID Introduction

    3- IS-IS Cisco Three Way Handshake Introduction

    4- IS-IS IETF  Three Way Handshake Introduction

    5- IS-IS IETF  Three Way Handshake Configuration

    6- Changing Network Type from Broadcast to Point-to-Point

  • IS-IS Behavior on Point to Point Network Types Quiz
  • IS-IS Behavior on Broadcast Network Types34:30

    1- IS-IS Packet Introduction

    2- IS-IS Neighbor Discovery Process on Broadcast Network

    3- IS-IS Circuit ID in Broadcast Network

    4- IS-IS Reserved MAC-Address for Level-1 PDU

    5- IS-IS Reserved MAC-Address for Level-2 PDU

  • IS-IS Behavior on Broadcast Network Types Quiz
  • IS-IS LSP Behavior and Synchronization PDU Analysis59:16

    1- IS-IS LSP Sequence Number Details

    2- IS-IS LSP Holdtime Details

    3- IS-IS LSP Zero Age Life Time Introduction

    4- IS-IS minimum LSP Transmission Interval Introduction

    5- IS-IS LSP ID Details

    6- IS-IS CSNP [ Complete Sequence Number PDU ] Introduction

    7- IS-IS PSNP [ Partial  Sequence Number PDU ] Introduction

  • IS-IS LSP Behavior and Synchronization PDU Analysis Quiz
  • IS-IS CSNP and PSNP Operation in Broadcast Networks37:57

    1- IS-IS CSNP [ Complete Sequence Number PDU ] in Broadcast Network

    2- IS-IS PSNP [ Partial  Sequence Number PDU ] in Broadcast Network

    3- IS-IS Pseudonode ID Introduction

    4- IS-IS CSNP,PSNP in Point-to-Point Vs. Broadcast Network

  • IS-IS CSNP and PSNP Operation in Broadcast Networks Quiz
  • IS-IS LSP CSNP PSNP Authentication Techniques Examination48:07

    1- Configuration of IS-IS LSP , CSNP , PSNP Authentication with Old-Style [Clear-Text]

    2- Configuration of IS-IS LSP , CSNP , PSNP Authentication with New-Style [Clear-Text]

    3- Configuration of IS-IS LSP , CSNP , PSNP Authentication with New-Style [MD5]

    4- Comparing IS-IS Hello Authentication with LSP Authentication

  • IS-IS LSP CSNP PSNP Authentication Techniques Examination Quiz
  • IS-IS Narrow and Wide Metric Operation58:53

    1- IS-IS Metric in Original IS-IS Specification

    2- IS-IS Default , Delay , Expense , Error Metric Types

    3- IS-IS Narrow Default Metric Types Introduction and Configuration

    4- IS-IS Wide   Default Metric Types Introduction and Configuration

    5- IS-IS Migration from Narrow Style to Wide Style

  • IS-IS Narrow and Wide Metric Operation Quiz
  • IS-IS Equal Cost Multipath Operation and Validation15:53

    1- IS-IS Equal Cost Multi Path [ECMP] Introduction

    2- IS-IS Equal Cost Multi Path [ECMP] Configuration

    3- IS-IS Equal Cost Multi Path [ECMP] Verification

  • IS-IS Equal Cost Multipath Operation and Validation Quiz
  • IS-IS Default Route Advertisement Operation and Validation31:07

    1- IS-IS Default Route Advertisement Introduction

    2- IS-IS Default Route Advertisement Configuration

    3- IS-IS Default Route Advertisement Verification

    4- IS-IS Conditional Default Route Advertisement Introduction

    5- IS-IS Conditional Default Route Advertisement Configuration

    6- IS-IS Conditional Default Route Advertisement Verification

  • IS-IS Default Route Advertisement Operation and Validation Quiz
  • IS-IS Summarization and Route Leaking Operation and Validation1:11:11

    1- IS-IS Summarization Introduction

    2- IS-IS Summarization Configuration

    3- IS-IS Summarization Verification

    4- IS-IS Route Leaking Introduction

    5- IS-IS Route Leaking Configuration

    6- IS-IS Route Leaking Verification

    7- IS-IS Discard Route Introduction

    8- IS-IS Inter Area Route Introduction

  • IS-IS Summarization and Route Leaking Operation and Validation Quiz

Requirements

  • Basic understanding of networking concepts (IP addressing, routing, subnets, etc.)
  • Familiarity with CLI-based network devices such as Cisco IOS, IOS XR, or similar platforms
  • General knowledge of IGPs (like OSPF or EIGRP) is helpful but not mandatory
  • A laptop/PC capable of running network simulators or virtualization tools (optional but recommended)
  • Optional lab tools such as EVE-NG, GNS3, or CML if you want to follow along with hands-on practice
  • No prior IS-IS experience is needed , this course takes you from fundamentals to expert-level design and troubleshooting.

Description

Unlock the Power of IS-IS for Your Networking Career

In the dynamic world of networking, IS-IS (Intermediate System to Intermediate System) has emerged as a vital protocol for building highly scalable, robust, and efficient networks. Whether in enterprise environments, service provider infrastructures, or cutting-edge data centers, IS-IS plays a pivotal role in delivering seamless connectivity and supporting advanced technologies like MPLS and Segment Routing.

As networks grow in size and complexity, the demand for professionals with IS-IS expertise continues to rise. By mastering IS-IS, you position yourself as a top-tier networking professional capable of designing, implementing, and troubleshooting some of the most advanced network architectures in the world. This knowledge not only enhances your technical skills but also boosts your career opportunities in a competitive and evolving industry.

Organizations rely on IS-IS for its flexibility, scalability, and unmatched performance in mission-critical networks. By gaining a deep understanding of this protocol, you’ll become an indispensable asset in building and maintaining the backbone of modern connectivity.

Take this opportunity to elevate your networking career, gain sought-after expertise, and stay ahead in the rapidly changing technology landscape. The world of IS-IS is full of possibilities—start your journey today and unlock the doors to your success!

Who this course is for:

  • Network Engineers and Architects who want to fully understand IS-IS operations, optimization, and design.
  • Service Provider Engineers working with IOS XR or other SP platforms who need deep IS-IS knowledge for daily operations.
  • Enterprise Network Engineers looking to expand beyond OSPF/EIGRP and learn a carrier-grade routing protocol.
  • CCNP, CCIE Candidates preparing for advanced routing and service provider exams.
  • Students or Early-Career Technicians who want to upgrade their IGP knowledge and stand out professionally.
  • Anyone transitioning into SP, data center, or large-scale network environments where IS-IS is widely deployed.
  • Lab enthusiasts and home-lab builders who want hands-on, real-world IS-IS skills.

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