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For vlan environment, we don't need to mention the flag --network_driver for nova-compute service. Instead we have new flag 'xenapi_vif_driver' which defaults to nova.virt.xenapi.vif.XenAPIBridgeDriver if not specified in configuration file. For default vlan environment in on xen flavors, we don't need to specify this either.

In nova revision 1321 (merged into nova on 26th July 2011) is removed. In that revision the VIF network connectivity logic is moved from the network managers to the virt layer. In addition, VIF driver class is added to allow customized VIF configurations for various types of VIFs and underlying network technologies.