Arie Bregman

Linux And Stuff

Tag: l3

Openstack Neutron: Introduction

Note: this introduction based on the great presentations: Introduction to OpenStack Neutron  by Assaf Amuller & Virtual Networking in OpenStack: Neutron 101 by Mark McClain and Kyle Mestery. So I highly recommend to watch those. If you don’t have the time or prefer reading, you have it gathered here. Enjoy 🙂

Neutron Core Concepts

Neutron three core concepts ( aka core resources) are:

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Openstack Neutron: L2 & L3 agents

Important note: This post is a written form of this great presention of Carl Baldwin and Rossella Sblendido. Usually when I watching vids, I write down some notes. In this case I decided to gather most of the presention content here in one post and share it with you as you may find it also useful. Enjoy 🙂

L2 Agent

Its main responsibility is to wire new devices (TAP interfaces created by Nova) and to configure the software bridges on the compute nodes. There are usually two bridges: br-int and br-tun.

br-int is the integration bridge. It’s the bridge that takes care of tagging & untagging the traffic which coming in or out of the VMs. To tag the traffic, it uses local vlan id and assign it to the network.

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