Scale Testing OVN

Recently, I’ve been spending an increasing amount of time building a virtual networking layer. Of course, I’m doing this using both Open vSwitch as well as OVN. I’ve been lucky enough to be a part of a few talks on OVN, so I won’t go into many details on OVN here. But I will say we’ve found it to be a great solution to solving virtual networking at scale. What I’d like to discuss here is some of the things we’re testing with regards to OVN at scale.

Subnetpools in Neutron

One of the most interesting new features in Neutron for the Kilo release is the addition of subnetpools to the API. This work was initially targeted to integrate nicely with pluggable IPAM. Unfortunately, this did not make it into Kilo and is targeted at Liberty. But even without pluggable IPAM as a consumer, the subnetpools addition is quite useful. Here’s an example of how you might use it. neutron net-create webapp neutron subnetpool-create –default-prefixlen 24 –pool-prefix 10.10.0.0/16 webpool neutron subnet-create –subnetpool webpool websubnet What I’ve shown above is the creation of a network, pool, and subnet for an example web application.