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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 VPC VR router sits at the boundary of the VPC identified by a unique area. This router will advertise its routing table to the Area 0 router which is a core router and also a area boundary 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).

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

OSPF Transit Network

The default public network (VPC-Transit network) will be used as transit network for OSPF for all the dynamically routed VPCs in the zone. If dynamic routing is enabled for the the zone additional information will be collected. This information will be stored in network_details table for the given public network.

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