Bug 1042605

Summary:	[RFE][neutron]: Add Distributed Router into OVS Plugin
Product:	Red Hat OpenStack	Reporter:	RHOS Integration <rhos-integ>
Component:	RFEs	Assignee:	RHOS Maint <rhos-maint>
Status:	CLOSED UPSTREAM	QA Contact:
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	unspecified	CC:	markmc, yeylon
Target Milestone:	---	Keywords:	FutureFeature
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
URL:	https://blueprints.launchpad.net/neutron/+spec/ovs-distributed-router
Whiteboard:	upstream_milestone_none upstream_status_started upstream_definition_obsolete
Fixed In Version:		Doc Type:	Enhancement
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2015-03-19 17:19:07 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:

Description RHOS Integration 2013-12-13 00:28:56 UTC

Cloned from launchpad blueprint https://blueprints.launchpad.net/neutron/+spec/ovs-distributed-router.

Description:

The goal of this blueprint is to implement distributed router in openvswitch plugin. Openvswitch plugin is the most popular plugin nowadays. However, lots of people found that under heavy east-west traffic, current l3-agent router becomes the bottle neck.

With the help of distributed router in ovs plugin, it's not necessary for east-west traffic to traverse network node to get routing decision anymore. Instead, those traffic will be delivered directly from the source hypervisor to the destination hypervisor.

The test result of our POC shows distinct performance imporvement on several aspects. Advantages we can get:
1. East-west total throughput will increase distinctly when more hypervisors are involved.
2. Under high concurrency of east-west traffic, on average, each VM will obtain a better bandwidth.
3. North-south and east-west traffic don't impact each other anymore. North-south traffic enjoys all the bandwidth of router exclusively.
4. No more unnecessary circuitous path, when east-west session happens between two VMs on the same hypervisor.

Specification URL (additional information):

https://wiki.openstack.org/wiki/Distributed_Router_for_OVS