[neutron][ovn] VLAN Ranges

Slawek Kaplonski skaplons at redhat.com
Thu Dec 16 07:42:26 UTC 2021


On środa, 15 grudnia 2021 22:19:23 CET Ammad Syed wrote:
> Hi,
> I am using neutron xena release with OVN. I have currently defined the vlan
> range "network_vlan_ranges = vlannet1:3500:3600" in ml2_conf.ini.
> I have set bridge mapping via ovs with the below command.
> ovs-vsctl set open . external-ids:ovn-bridge-mappings=vlannet1:br-vlan
> Now I have to add a new vlan range. Can anyone confirm the syntax of
> ml2_conf.ini and bridge mapping.
> network_vlan_ranges = vlannet1:3500:3600,vlannet2:300:400

That syntax is correct. This config option is comma-separated list of physnets 
and ranges as You did above.

> ovs-vsctl set open .
> external-ids:ovn-bridge-mappings=vlannet1:br-vlan,vlannet2:br-vlan
> Need to confirm the correct way to add new vlan range if the server is
> currently live ? Can we use the same bridge with two different mapping i.e
> vlannet1 and vlannet2 ?

No. On bridge can be mapped to one physical network. We even had proposal to 
change it recently: https://bugs.launchpad.net/neutron/+bug/1952867 but finally 
we decided that we don't want to allow that.

> Ammad

Slawek Kaplonski
Principal Software Engineer
Red Hat
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