Non contiguous vlan ranges.

Introduction:

This document describes the multiple vlan range feature.
Presetntly in cloudstack we can only extend the vlan range but cannot add multiple non contiguous vlan ranges. This feature provides this flexibility to add multiple vlan ranges.

Use case:

The admin may want to add a new vlan range once the existing vlan range is exhausted or the admin may want to add multiple vlan ranges based on the way he provisioned vlans.

Design description:

Admin can update the vlan range after creation or can add multiple non contiguous vlan ranges while creating a zone. This can be done by changing the UpdatephysicalNetwork api. It allows only extending of the vlan. we plan to extend the api to update the vlan with multiple ip ranges.

API

addvlanrange parameter will add a new vlan range to the existing vlan range. if the new vlan range overlaps the existing vlan range it will extend that vlan.
removevlanrange parameter will remove the mentioned vlan with the new vlan. The removevlanrange and addvlanrange parameters can be used together. If the vlan range we are trying to remove is in use, the operation will not succeed.

Db changes.

No data base changes are required.