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Book Overview & Buying
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Table Of Contents
Learning OpenStack Networking (Neutron), Second Edition
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When using the Open vSwitch driver, for an Ethernet frame to travel from the virtual machine instance out through the physical server interface, it will potentially pass through nine devices inside the host:
The tap interface: tapXXXX
The Linux bridge: qbrXXXX
The veth pair: qvbXXXX, qvoXXXX
The OVS integration bridge: br-int
OVS patch ports: int-br-ethX and phy-br-ethX
The OVS provider bridge: br-ethX
The physical interface: ethX
The OVS tunnel bridge: br-tun
The Open vSwitch bridge br-int is known as the integration bridge. The integration bridge is the central virtual switch that most virtual devices are connected to, including instances, DHCP servers, routers, and more. When Neutron security groups are enabled, however, instances are not directly connected to the integration bridge. Instead, instances are connected to individual Linux bridges that are cross connected to the integration bridge using a veth cable.
The reliance on Linux bridges...
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