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L3 connectivity using neutron-l3-agent

The neutron l3 agent is responsible for providing service for routing, natting, security-group rules and floatingip allocation. This purpose of this post is to document its working principles and also to enable users to effectively debug their Openstack cloud(most problems occur due to user mis configuration). The l3 agent offers these services from the network node and relies on neutron-openvswitch-agent to provide l2 connectivity to the instances running on compute nodes. This post assumes that the readers are aware of how l2 connectivity is achieved using ‘openvswitch’ mechanism driver. Continue reading “L3 connectivity using neutron-l3-agent”

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Cloud · Havana · IceHouse · Network Management · Neutron · Open vSwitch · OpenFlow · OpenStack · Quantum

Open vSwitch in Openstack

Coffee Breaks

A multitude of Openstack users eventually run into Open vSwitch. Not because they want to, but because they have to. So here is something to deconstruct what Open vSwitch really is, and what it does.

What is Open vSwitch?

In the words of the Open vSwitch website:

“Open vSwitch is a production quality, multilayer virtual switch licensed under the open source Apache 2.0 license.  It is designed to enable massive network automation through programmatic extension, while still supporting standard management interfaces and protocols (e.g. NetFlow, sFlow, SPAN, RSPAN, CLI, LACP, 802.1ag).”

Openstack uses Open vSwitch as its default virtual switch. There are various reasons for this. The primary reason is VLAN support. Open vSwitch is inherently built with VLAN support, and Openstack uses VLANs extensively to differentiate between its virtual networks. Also, Open vSwitch is works very well in a distributed environment. This is extremely important in a platform like…

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Network Management · Open source · Open vSwitch · Quantum

GRE mode in OpenVswitch on OpenStack Grizzly

The following procedure is tested on OpenStack grizzly version running on Ubuntu 12.04

Before creation of any networks in the OpenStack setup, add the following lines in /etc/quantum/plugins/openvswitch/ovs_quantum_plugin.ini under “[OVS]” section on all the machines of an OpenStack setup running Open vSwitch and Open vSwitch agents.

Continue reading “GRE mode in OpenVswitch on OpenStack Grizzly”

Network Management · Open vSwitch · Quantum

Vlan mode in OpenVswitch on OpenStack Grizzly

The following procedure is tested on OpenStack grizzly version running on Ubuntu 12.04

Before creation of any networks in the OpenStack setup, add the following lines in /etc/quantum/plugins/openvswitch/ovs_quantum_plugin.ini under “[OVS]” section on all the machines of an OpenStack setup running Open vSwitch and Open vSwitch agents.

Continue reading “Vlan mode in OpenVswitch on OpenStack Grizzly”