From #eucalyptus scrollback:
[16:42] < Ng> ideally I'd like to be able to tell eucalyptus that it has a
particular pool of tags, since the machines are on switches with
pre-existing vlans
[16:44] < dmitrii> Understandable. Currently Eucalyptus assumes that all vlan
tags are fair game. It makes sense to make that configurable.
We'll note that as a feature request.
The rough topology of our switch is that VLANs 0-5 are already occupied and the ports the Node Controller machines will be connected to will have precisely no access to those VLANs for security reasons, so I need to be able to tell Eucalyptus to use VLANs 6-20 (for the sake of argument, it could be any number really) so I can pre-configure the switch to allow the NC ports to use those tags.
We've made some changes in this area so in our configuration file we have added the following values:
MIN_VLAN_ID="10"
MAX_VLAN_ID="969"
This allows Eucalyptus to use VLANS betwen these two numbers. This gives us test and development environments on the same network. I can share the changes here if you'd like to see?