The Open vSwitch plugin with VLANs

This post looks at the Grizzly Open vSwitch plugin when it is configured to use VLANs to isolate the VM traffic of different Quantum networks on the physical network.

Path MTU discovery and GRE

When using the Open vSwitch Quantum plugin with GRE there can be problems connecting to some sites while other sites work fine. E.g. 'git clone' hangs or 'apt-get update' takes over an hour. This is because the GRE tunnel can reduce the path MTU to a value less than the common 1500 bytes, and some sites do not engage in standard techniques for path MTU discovery.

Debugging Quantum DHCP and Open vSwitch

This post describes how Quantum DHCP in Grizzly works when using the Open vSwitch plugin. A basic understanding of the mechanism is needed to troubleshoot issues.