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virtual network card tap device Vnet0/vent1 to the same two-tier network, enabling virtual machine VM1 and VM2, and communication between the virtual machine and the extranet.For more detailed information on Linux Bridge, please refer to the section "Pre-knowledge-network virtualization".Configuring Linux-bridge mechanism DriverTo use Linux Bridge in Neutron, yo

respective ml2_conf.ini.After the Neutron service starts normally, all nodes will run Neutron-linuxbridge-agent650) this.width=650; "Title=" http://7xo6kd.com1.z0.glb.clouddn.com/ Upload-ueditor-image-20160824-1471992817408015123.png "src=" http://7xo6kd.com1.z0.glb.clouddn.com/ Upload-ueditor-image-20160824-1471993265149058572.jpg "style=" border:0px;white-space:normal;float:none; "/>Linux-bridge mechanism driver is configured, the next section exam

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, because the traffic sent to the outside network is forwarded through the virtual router on the network node, so the Br-ext will only be placed on the network node (Devstack-controller).understand the various network devices in the Open vSwitch environmentIn an Open vSwitch environment, a packet sent from the instance to the physical NIC will roughly go through the following types of devices: Tap interface is named Tapxxxx. Linux Bridge is name

. VM2 is located in another local network, VM2 cannot communicate with VM0 and VM1 because Brqxxxx and brqyyyy are not connected. Next we will implement the local network step-by-step.enable local network in the ML2 configurationMake sure that ML2 has loaded the local type driver before you create the local network. The ML2 configuration file is located in/etc/neutron/plugins/ml2/ml2_conf.ini.Type_drivers tells ML2 to load all 5 types of netw

) cannot have two VLAN sub-devices of the same ID, so there is no possibility of data exchange. Linux Bridge is designed for switching functions. The sub-devices of the same VLAN are mounted on a Bridge, and data can be exchanged between devices. In summary, Linux Bridge plus VLAN emulates the real-world two-layer switch at the functional level.The eth0 is equ

driver for Linux Bridge and open Vswitch is to configure the virtual switches on each node. The type supported by Linux Bridge driver includes local, flat, VLAN, and Vxlan. Open Vswitch Driver supports GRE in addition to these 4 types.L2 population driver function is to optimize and limit the broadcast traffic in the overlay network. Both Vxlan and GRE belong to the overlay network.ML2 Core plugin has beco

one by one corresponding. That is, if you choose Linux Bridge plugin, then the Linux Bridge Agent will be the only option, and you must use Linux Bridge as a virtual switch on all OpenStack nodes (that is, the network provide R).Similarly, if you choose Open Vswitch plugin, only open vswitch can be used on all nodes, and no other network provider can be used.Iss

Bridge to open VSwitch, you first need to install the Open VSwitch Agent. To modify the Devstack local.conf:Rerun./stack,devstack will automatically download and install the Open vSwitch.You can then modify the ML2 configuration file/etc/neutron/plugins/ml2/ml2_conf.ini, which is set using Openvswitch mechanism driver.Both the control node and the compute node need to install and configure the Open VSwitch as described above.After the Neutron service

. Veth pair named Qvbxxxx, Qvoxxxx. OVS Integration Bridge is named Br-int. OVS patch ports is named Int-br-ethx and PHY-BR-ETHX (ordinal of Interface). OVS provider Bridge is named Br-ethx (X is the ordinal of the interface). The physical interface is named EthX (X is the ordinal of interface). OVS Tunnel Bridge is named Br-tun. OVS

Opendaylight, VMWare NSX, and more.Physical switch basedIncludes Cisco Nexus, Arista, Mellanox, and more. For example, in the previous example, if you switch to Cisco's mechanism driver, you will add vlan100 on the specified trunk port of the Cisco physical switch.The mechanism driver discussed in this tutorial will cover Linux bridge, open vswitch and L2 population.The role of ML2 mechanism driver for Linux Brid