Hi Lokendra: The only place I found a documented reference is [1]. If the "--provider-segment" is given to the network creation command, that will override the VLAN ranges defined per physical network in "ml2_type_vlan:network_vlan_ranges". If no pre-allocated segment is found (this process is done during the Neutron server initialization), a new one is created with the parameters the user provided [2]. Regards. [1] https://www.oreilly.com/library/view/learning-openstack-networking/978178839... [2] https://github.com/openstack/neutron/blob/db83514d052ceede559894a1439c2b45ee... On Wed, May 18, 2022 at 10:22 AM Lokendra Rathour <lokendrarathour@gmail.com> wrote:

Hi Team, We have deployed tripl0 Train using two tenant networks by configuring the parameters for additional networks. environments.yaml: *NeutronBridgeMappings: datacentre:br-tenant,datacentre2:br-extratenant*

in environments/network-environment.yaml

* NeutronNetworkVLANRanges: 'datacentre:1:500,datacentre2:501:1000'*

and have also isolated and separated the physical nic configuration for ovs in network/config/bond-with-vlans/compute.yaml

with this setting, overcloud is deployed and the network is getting created, Checking further, in Controller configs(/etc/neutron/plugins/ml2/) we see the changes as below, which looks fine:

*[ml2_type_vlan]* *network_vlan_ranges=datacentre:1:500,datacentre2:501:1000*

*but it is also allowing* the network to be created from the wrong network segment range. For example, while creating a network:

- openstack network create --share --provider-network-type vlan --provider-physical-network datacentre2 --provider-segment 420 datacenter_2_420

-provider-physical-network- *"datacentre2"* is having VLAN range from 501-1000 and if I am passing the provider segment as 420(which is out of range) then *also a network is getting created.*

This does not look fine. please help share any inputs on the same. -- ~ Lokendra skype: lokendrarathour