# add the namespaces
ip netns add ns1
ip netns add ns2
# create the veth pair
ip link add tap1 type veth peer name tap2
# move the interfaces to the namespaces
ip link set tap1 netns ns1
ip link set tap2 netns ns2
# bring up the links
ip netns exec ns1 ip link set dev tap1 up
ip netns exec ns2 ip link set dev tap2 up
# now assign the ip addresses
# add the namespaces ip netns add ns1 ip netns add ns2 # create the switch BRIDGE=br-test brctl addbr $BRIDGE brctl stp $BRIDGE off ip link set dev $BRIDGE up # #### PORT 1 # create a port pair ip link add tap1 type veth peer name br-tap1 # attach one side to linuxbridge brctl addif br-test br-tap1 # attach the other side to namespace ip link set tap1 netns ns1 # set the ports to up ip netns exec ns1 ip link set dev tap1 up ip link set dev br-tap1 up # #### PORT 2 # create a port pair ip link add tap2 type veth peer name br-tap2 # attach one side to linuxbridge brctl addif br-test br-tap2 # attach the other side to namespace ip link set tap2 netns ns2 # set the ports to up ip netns exec ns2 ip link set dev tap2 up ip link set dev br-tap2 up #
# add the namespaces ip netns add ns1 ip netns add ns2 # create the switch BRIDGE=ovs-test ovs-vsctl add-br $BRIDGE # #### PORT 1 # create a port pair ip link add tap1 type veth peer name ovs-tap1 # attach one side to ovs ovs-vsctl add-port $BRIDGE ovs-tap1 # attach the other side to namespace ip link set tap1 netns ns1 # set the ports to up ip netns exec ns1 ip link set dev tap1 up ip link set dev ovs-tap1 up # #### PORT 2 # create a port pair ip link add tap2 type veth peer name ovs-tap2 # attach one side to ovs ovs-vsctl add-port $BRIDGE ovs-tap2 # attach the other side to namespace ip link set tap2 netns ns2 # set the ports to up ip netns exec ns2 ip link set dev tap2 up ip link set dev ovs-tap2 up #
# add the namespaces ip netns add ns1 ip netns add ns2 # create the switch BRIDGE=ovs-test ovs-vsctl add-br $BRIDGE # #### PORT 1 # create an internal ovs port ovs-vsctl add-port $BRIDGE tap1 -- set Interface tap1 type=internal # attach it to namespace ip link set tap1 netns ns1 # set the ports to up ip netns exec ns1 ip link set dev tap1 up # #### PORT 2 # create an internal ovs port ovs-vsctl add-port $BRIDGE tap2 -- set Interface tap2 type=internal # attach it to namespace ip link set tap2 netns ns2 # set the ports to up ip netns exec ns2 ip link set dev tap2 up
性能测试：
http://www.opencloudblog.com/?p=96
http://www.opencloudblog.com/?p=386
结论：
The short summary is:
If you are running Openstack Neutron, you should use the Openvswitch. Avoid linuxbridges. When connecting the Neutron networking Router/LBaas/DHCP namespaces DO NOT enable ovs_use_veth.
原文：http://www.cnblogs.com/allcloud/p/4919674.html