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vNIC trunking on Openstack VMs

Currently vLAN trunking is not allowed in versions earlier than Openstack Newton. As a temporary fix VLAN trunking on vNICs can also be achieved by creating a custom L2 bridge between the L2 Bridge and Integration Bridge in Openstack. However this would require the following custom modifications for each virtual machine in which vNIC trunking is required: a. Creating the Custom (Trunk Bridge) b. Adding custom open virtual switch flows for VLAN trunking in the custom trunk bridge c. Creating interfaces (Tap interfaces or virtual Ethernet pairs) on the L2 security group bridge, the trunk bridge and the integration bridge d. Connecting the bridges together via the interfaces created

How can this be achieved? Is it possible?