Controller/Compute nodes  : neutron + ovs agent

vm 启动后会发送dhcp request, 路径是: 

(Compute node)vm tapxxx->ovs bridge(br-int)->ovs bridge(br-eth0)-> phy-nic --------->(Controller node)phy-nic->ovs bridge(br-int)->ovs bridge(br-eth1)->dhcp tapxxx

dhcp server 按照原路径返回response


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