IS-IS

IS-IS is a network mechanism used to route, encapsulate, filter, or make IP traffic resilient.

Simple definition

IS-IS is a network mechanism used to route, encapsulate, filter, or make IP traffic resilient. It belongs to the Networking vocabulary.

What is it used for?

Its main purpose is to control paths, availability, and segmentation of communications.

How does it work?

devices apply tables, metrics, adjacencies, tunnels, or policies according to the relevant protocol.

Key points

• Scope: A network mechanism used to route, encapsulate, filter, or make IP traffic resilient.
• Operational goal: Control paths, availability, and segmentation of communications.
• Mechanism: devices apply tables, metrics, adjacencies, tunnels, or policies according to the relevant protocol.

Points to watch

Loops, asymmetry, MTU, and routing interactions should be monitored during changes.

In short

IS-IS is a Networking concept to know when you need to control paths, availability, and segmentation of communications.