Single Vlan Network

Using the Default VLAN ID

This scenario uses a VLAN aware vswitch and its default (defined in z/VM) VLAN ID. You do not need to configure any additional information in OpenStack related to the VLAN in the network. To OpenStack the infrastructure appears the same as in the Flat network scenario. You can configure your vswitch name to flat_network or network_vlan_ranges. You do not need to configure the VLAN ID for your network in OpenStack as it appears to OpenStack as a “FLAT” network.

To use this scenario, the following configuration options are needed:

• Specify one of the following options in the neutron ML2 plugin configure file (default file name is /etc/neutron/plugins/ml2/ml2_conf.ini):

  flat_networks = vsw3
  network_vlan_ranges = vsw3:1:4094
  

Note

“vsw3” is used by the z/VM cloud connector, so you should create this as a VLAN aware Layer 2 vswitch with a default VLAN ID defined on z/VM.

• In the neutron z/VM agent configure file (default file name is /etc/neutron/plugins/zvm/neutron_zvm_plugin.ini), the following options are needed:

  [AGENT]
  cloud_connector_url = http:// 10.0.0.3:8080/
  

Using the User-Specified VLAN ID

This scenario uses a VLAN aware SWITCH with the VLAN ID specified in OpenStack instead of using the defined default VLAN ID specified for the vswitch in z/VM. The difference between this scenario and Using the Default VLAN ID above is that here the OpenStack user must specify a VLAN ID for the instances to be deployed.

To use this scenario, the following configuration options are needed:

• In the neutron ML2 plugin configuration file (default file name is /etc/neutron/plugins/ml2/ml2_conf.ini), make sure that the network_vlan_ranges property is specified as follows:

  network_vlan_ranges = vsw3:1:4094
  

Note

“vsw3” is used by the z/VM cloud connector. It should be a VLAN aware Layer 2 vswitch on z/VM.

• In the neutron z/VM agent configuration file (default file name is /etc/neutron/plugins/zvm/neutron_zvm_plugin.ini), the following options are needed:

  [AGENT]
  cloud_connector_url = http:// 10.0.0.3:8080/
  [vsw3]
  # OSA2 uses RDEV A3
  rdev_list=a3
  

After restarting the neutron server and neutron z/VM agent, follow these steps on the OpenStack controller to create the network and subnet for each of the physical networks.

• Create the vlan network. Enter the following command:

  openstack network create --shared --provider-network_type vlan --provider-physical_network vsw3 --provider-segment 521 vlannet
  

Note

The segmentation_id is the VLAN ID. It should be in the range of network_vlan_ranges in /etc/neutron/plugins/ml2/ml2_conf.ini.

• Create the appropriate subnet for the network:

  Openstack subnet create --allocation-pool start=1.2.3.5,end=1.2.3.254 --network vlannet --subnet-range 1.2.3.0/24 --gateway 1.2.3.1 vlannet-sub
  

When new instances are spawned, neutron-zvm-agent will set the VLAN ID(521) for each instance.