Learning OpenStack Networking - Third Edition

Identifying the local VLANs associated with ports

Every port on the integration bridge connected to an instance or other network resource is placed in a VLAN that is local to that virtual switch.

The Open vSwitch database on each host is independent of all other hosts, and the local VLAN database is not directly related to the physical network infrastructure. Instances in the same Neutron network on a particular host are placed in the same VLAN on the local integration bridge, but there is no VLAN ID consistency expected between hosts. That said, flow rules will be implemented on each host that maps the local VLAN ID to the ID associated with the respective Neutron network, allowing for traffic between hosts across the common VLAN. This behavior ...