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When OSPF is selected for a zone, cloudstack will prompt for additional information in order to configure a inter VPC-Transit network on the existing (?) public network for this zone.  A  For simplicity we will use the existing zone wide public network as VPC-transit network. A VPC VR router sits at the boundary of the VPC tiered network in Area X. This router will advertise its routing table to the other Area X routers including the designated router. These routes are then picked up by other boundary routers. When one of the VPC's VM wants to communicate with another VPC's VM the router now knows how to direct the traffic via the VPC/Transit network(which is also the cloudstack public network).

All the VPC VR will be connected to transit network forming OSPF Area X. Cloudstack will auto generate the priorities of these routers that will help them elect a designated router.

So that none of the existing functionality is affected all the existing static routes will also be set on quagga router.

Limitation: In this first implementation, 1.  only one OSPF area per Zone will be supported, 2. the implementation will be for IPv4 only.

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