Configuring the VLAN range to be used for the networks
In order to use VLAN as the network type, Neutron requires a range of VLAN identifiers. Each OpenStack Network will be associated with a unique VLAN identifier. This recipe shows you how to configure this range of VLAN IDs.
Getting ready
The valid range for a VLAN ID is 1-4095. However, based on your OpenStack environment and the physical network, it is possible to use a subset of this range.
How to do it…
Configuring the VLAN ID range is a setting in the plugin configuration file. The following steps will show you how to set this range:
- With the appropriate credentials, SSH into the node where the Neutron server is running.
- Open the Neutron ML2 plugin configuration file using your desired editor. For example, the command for vi editor will be as follows:
openstack@controller:~$ sudo vi /etc/neutron/plugins/ml2/ml2_conf.ini - In the
[ml2_type_vlan]section of the file, configure the VLAN range:[ml2_type_vlan] ... network_vlan_ranges = physnet1:1001:1200
- For this recipe, we have used a VLAN ID range of 1001 to 1200.
- The keyword
physnet1represents the alias for the physical network. This refers to the OVS bridge that is bound to the physical Network adapter on the node. - These steps have to be repeated for all the nodes in your OpenStack setup including all the compute and Network nodes.
How it works…
When a network is created, Neutron will check the tenant network type first. In the case of the VLAN networks, Neutron will fetch the first unused VLAN ID from the range that was configured. This VLAN ID is then associated to the Network and also marked as used.