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Programmability of virtual switches in hypervisor combined with ability to process and take actions on data path flows with OpenFlow opens up different possibilities where L2-L4 services typically provided by virtual/physical appliances are pushed on to edge switches on the hypervisors. Current VPC network services, network ACL and inter-tier routing provided by CloudStack for east-west traffic (inter-tier traffic in VPC) can be orchestrated to be provided by virtual switches in hypervisors. Goal of this proposal to add distributed routing and ACL functionality to native SDN controller that leverages OpenVswitch capabilities to provide inter-tier routing and network ACL's at hypervisor level in distributed fashion. This would enable a scale-out model and avoids VPC VR being choke point. Also traffic trombone problem is eliminated as traffic gets routed directly to destination hypervisor from source hypervisor.

This enhancement is tracked under:CLOUDSTACK-6161

References

[1]http://blog.ipspace.net/2011/02/traffic-trombone-what-it-is-and-how-you.html

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