OpenStack+OpenContrail: Do I need to ensure OpenStack network state is clean before integrate OpenContrail with an existing Openstack?

Question

I'm trying to integrate OpenContrail as SDN Controller with an existing OpenStack installation.

Before this choice i also read the OpenDaylight project documentation for the ODL Installation on an existing OpenStack. I learnt that, before the installation, I should ensure OpenStack network state is clean.

OpenContrail documentation doesn't refer to this kind of requirements.

The question is: Do I need to ensure OpenStack network state is clean before integrate OpenContrail with an existing Openstack?

Answer 1

I don't think you need to clean Openstack before integrating with Contrail. Though the already created networks on Openstack will not be available in contrail dashboard. All the future networks which you create in Contrail will be synced with Openstack.

Answer 2

I discovered that:

"After its integration, Contrail will ignore all information in the neutron db. Any incoming neutron api call will be translated to a contrail-api call.

Contrail itself does not use the Mysql database but has its own (Cassandra) databases

So any router/subnet/network/interface etc object that currently exists in the neutron/mysql database is ignored.

That basically means you will need to re-create each object that you are using with neutron".