1. Local

2. Vlan

3. Vlan Compute node 1. qbrXXX: linux bridge, q-quantum, br-bridge 1. qvbXXX/qvoXXX: a veth pair devices, connect bridge and OVS q-quantum, v-veth, b-bridge, o-open vswitch 1. int-br-eth1 and phy-br-eth1 a veth pair devices, connect br-int and br-eth1

4. Vlan network node 1. qr-YYY and qg-VVV: q-quantum, r-router, g-gateway qr-YYY have a internal ip, and qg-VVV have an external ip, and they are connected by iptables NAT rules. 1. phy-br-ex and int-br-ex All packets must go through a physnet, even though qr and qg have nat, they still need to connected by a veth pair.

OpenStack Networking (“Neutron”)

OpenStack Networking Overview

OpenStack Networking Architecture

OpenStack Networking Plug-ins

• Open vSwitch (openstack-neutron-openvswitch)
• Linux Bridge (openstack-neutron-linuxbridge)
• Cisco (openstack-neutron-cisco)
• NEC OpenFlow (openstack-neutron-nec)
• VMware (openstack-neutron-vmware)
• Ryu (openstack-neutron-ryu)

Modular Layer 2 (ML2) Overview

• The requirement behind ML2
• ML2 network types
  • flat
  • GRE
  • local
  • VLAN
  • VXLAN
• ML2 Mechanisms
  • Arista
  • Cisco
  • Nexus
  • Hyper-V Agent
  • L2 Population
  • Linuxbridge Agent
  • Open vSwitch Agent
  • Tail-f NCS

Reference:

Neutron Administrator Guide

Nova

OpenStack OVS GRE/VXLAN网络

openstack 网络架构

RedHat Doc

OVS scenario

Install Guide