New Skills

New Training: Advanced IS-IS Foundations

by Team Nuggets
New Training: Advanced BGP Foundations picture: A
Published on May 6, 2021

In this 10-video skill, CBT Nuggets trainer Knox Hutchinson explores deeper theoretical understandings of IS-IS on Junos devices. Watch this new Juniper training.

Learn Juniper with one of these courses:

This training includes:

  • 10 videos

  • 1.4 hours of training

You’ll learn these topics in this skill:

  • Introducing Advanced IS-IS Foundation

  • Multi-Level IS-IS Refresher

  • IS-IS Packet Types

  • Basic Multi-Level IS-IS Deployment on JUNOS

  • LSPDU Contents and Common TLVs

  • PDU Flooding and Mesh Groups

  • Metric Tuning

  • Validating IS-IS Config and LSDB

  • Hierarchical Authentication

  • Summarizing Advanced IS-IS Foundations

What is An IS-IS Hello Packet?

IS-IS is an interior gateway protocol (IGP) available on Juniper networking equipment. Much like OSPF, it's a link-state-based IGP. It's preferred over OSPF due to its inherent security and modularity, though. Likewise, much like OSPF, it uses something called a 'Hello' packet for discovery.

A 'Hello' packet is a broadcast packet used to discover the identity of neighboring networking devices. It uses these packets to determine if other devices are level 1 or level 2 intermediate devices.

These 'Hello' packets come in three forms:

  • Point-to-Point hello packets

  • Level 1 broadcast links

  • Level 2 broadcast links

It should be noted that level 1 routers have to share the same area address to form an adjacency. Level 2 routers do not have that limitation.

The length of each 'Hello' packet is preset. IS-IS routers do not resize these packets. Instead, each interface supports the maximum packet size of 1492 bytes. Packets are padded to meet this size.

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