CMPE 210 Lecture Notes - Lecture 5: Virtual Extensible Lan, Network Virtualization, Virtual Lan

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5 Dec 2016
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For maintaining connectivity, the neutron network uses plugins, drivers, and agents. These devices maintain the connectivity to and from the instances. Ml2 plugin as described above can leverage multiple layer two technology simultaneously using the mechanism drivers. The two drivers used by neutron are linux bridge and open v switch. Linux bridge is known for its ease of trouble shooting and dependability, but linux bridge lacks the support for some neutron features such as distributed virtual routers. Linux bridge supports five types of interfaces tap interface, physical interface, vlan interface, vxlan interface, linux. Hypervisor creates and uses a tap interface, such as kvm or qemu. Tap interfaces are used to connect the host to a guest operating system in a virtual machine instance. Guest operating system receives the ethernet frames sent to the tap devices on the host. Guest operating system after receiving these packets injects them into the host network stack.

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