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Learning OpenStack Networking (Neutron) - Second Edition by James Denton

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Visualizing traffic flow when using LinuxBridge

While an Ethernet frame travels from the virtual machine instance to a remote physical network, it passes through three or four of the following devices depending on the network type:

  • The tap interface: tapN
  • The Linux bridge: brqXXXX
  • The VXLAN interface: vxlan-Z (where z is the VNI)
  • The VLAN interface: ethX.Y (where X is the interface and Y is the VLAN ID)
  • The physical interface: ethX (where X is the interface)

To help conceptualize how Neutron uses Linux bridges, a few examples of LinuxBridge architectures are provided in the following sections.

VLAN

Imagine a basic OpenStack cloud that consists of a single network on VLAN 100 for use with instances. The network architecture within the compute node resembles ...

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