vlan translation in Quantum
I don't understand tha VLAN translation mechanism.
In the http://docs.openstack.org/network-admin/admin/content/under_the_hood_openvswitch.html (OS official guide) it's said the net01 and net02 have VLAN ID 1,2 while VLAN 101,102 are EXPLICITY specified in the quantum CLI commands.
Why the need to change the VLAN ID internally, that is inside the compute node and inside the network node?
Can anyone please explain me the mechanism and the reason behind this?
I'm using Openstack Grizzly.