VLAN network options

When creating networks, use these options:

--provider:network_type vlan --provider:physical_network physnet1 --provider:segmentation_id SEG_ID

SEG_ID should be 2 for the external network, and just any unique number inside the vlan range specified above for any other network.

	Note
	These options are not needed beyond the first network, as Neutron automatically increments the segmentation ID and copies the network type and physical network options for any additional networks. They are only needed if you wish to modify those values in any way.

Warning

	Warning
Some NICs have Linux drivers that do not handle VLANs properly. See the `ovs-vlan-bug-workaround` and `ovs-vlan-test` man pages for more information. Additionally, you might try turning off `rx-vlan-offload` and `tx-vlan-offload` by using `ethtool` on the `DATA_INTERFACE`. Another potential caveat to VLAN functionality is that VLAN tags add an additional 4 bytes to the packet size. If your NICs cannot handle large packets, make sure to set the MTU to a value that is 4 bytes less than the normal value on the `DATA_INTERFACE`. If you run OpenStack inside a virtualized environment (for testing purposes), switching to the `virtio` NIC type (or a similar technology if you are not using KVM/QEMU to run your host VMs) might solve the issue.

Some NICs have Linux drivers that do not handle VLANs properly. See the ovs-vlan-bug-workaround and ovs-vlan-test man pages for more information. Additionally, you might try turning off rx-vlan-offload and tx-vlan-offload by using ethtool on the DATA_INTERFACE. Another potential caveat to VLAN functionality is that VLAN tags add an additional 4 bytes to the packet size. If your NICs cannot handle large packets, make sure to set the MTU to a value that is 4 bytes less than the normal value on the DATA_INTERFACE.

If you run OpenStack inside a virtualized environment (for testing purposes), switching to the virtio NIC type (or a similar technology if you are not using KVM/QEMU to run your host VMs) might solve the issue.

Log a bug against this page

Legal notices