Cody writes:
What solution(s) other than DVR could I use to avoid north-south traffic congestion at the neutron server nodes? Basically, I wish to let VMs with floating IPs to route directly from their respective hypervisor hosts to the Internet.
Isn't that the DEFINITION of what DVR does? :-) (Not using DVR myself, so I may be wrong.) We push everything through those central nodes - we call them "network nodes". We try to alleviate the congestion by distributing routers across multiple nodes, and within each node we make sure that the forwarding plane (Open vSwitch in our case) is capable of using the "multi-queue" feature of the underlying network cards, so that packet forwarding is distributed across the multiple cores of those servers. That helped us a lot at the time. -- Simon.