Open Stack

I am planning to build openstack on production and big question is
network (legacy vs DVR) but in DVR big concern is number of Public IP
used on every compute node, I am planning to add max 100 node in
cluster in that case it will use 100 public IP for compute node, Ouch!

If i use legacy compute node then it could be bottleneck or failure
node if not in HA.

what most of company use for network node?  DVR or legacy?