Network Node is Not Needed Anymore - Completed Distributed Virtual Router
DVR (Distributed Virtual Router) was first implemented at Juno. Virtual routers needed to work on Network Node, but, with DVR, they can work on Compute Nodes. Since Network Node runs virtual routers and some other networking functions for all VMs, it was a single point of failure and can be a performance bottleneck. If you need a highly available OpenStack system, you needed a cluster of Network Node. And if you need to scale out the networking, you needed to add more Network Nodes.
With DVR,