Learning OpenStack Networking - Third Edition

Physical interface mappings

The physical_interface_mappings configuration option describes the mapping of an artificial label to a physical interface in the server. When networks are created, they are associated with an interface label, such as physnet1. The label physnet1 is then mapped to a physical interface, such as eth2, by the physical_interface_mappings option. This mapping can be observed in the following example:

physical_interface_mappings = physnet1:eth2 

The chosen label(s) must be consistent between all nodes in the environment that are expected to handle traffic for a given network created with Neutron. However, the physical interface mapped to the label may be different. A difference in mappings is often observed when one node ...