[Openstack-operators] Multiple vlan ranges on same physical interface [ml2]

George Shuklin george.shuklin at gmail.com
Fri May 8 16:35:53 UTC 2015

We've got a bunch of business logic above openstack. It's allocating 
VLANs on-fly for external networks and connect pieces outside neutron 
(configuring hardware router, etc).

Anyway, after some research we've decided to completely ditch idea of 
'tenant networks'. All networks are external and handled by our software 
with administrative rights.

All networks for tenant are created during tenant bootstrap, including 
local networks which are now looking funny 'external local network 
without gateway'. By nailing every moving part in 'neutron net-create' 
we've got stable behaviour and kept allocation database inside our 
software. That kills a huge part of openstack idea, but at least it 
works straightforward and nice.

I really like to see all that been implemented in vendor plugins for 
neutron, but average code and documentation quality for them are below 
any usable level, so we implements hw configuration by ourselves.

On 05/08/2015 09:15 AM, Kevin Benton wrote:
> If one set of VLANs is for external networks which are created by 
> admins, why even specify network_vlan_ranges for that set?
> For example, even if network_vlan_ranges is 'local:1000:4000', you can 
> still successfully run the following as an admin:
> neutron net-create --provider:network_type=vlan 
> --provider:physical_network=local --provider:segmentation_id=40 
> myextnet --router:external
> On Thu, May 7, 2015 at 7:32 AM, George Shuklin 
> <george.shuklin at gmail.com <mailto:george.shuklin at gmail.com>> wrote:
>     Hello everyone.
>     Got a problem: we want to use same physical interface for external
>     networks and virtual (tenant) networks. All inside vlans with
>     different ranges.
>     My expected config was:
>     [ml2]
>     type_drivers = vlan
>     tenant_network_types = vlan
>     [ml2_type_vlan]
>     network_vlan_ranges = external:1:100,local:1000:4000
>     [ovs]
>     bridge_mappings = external:br-ex,local:br-ex
>     But it does not work:
>     ERROR neutron.plugins.openvswitch.agent.ovs_neutron_agent [-]
>     Parsing bridge_mappings failed: Value br-ex in mapping: 'gp:br-ex'
>     not unique. Agent terminated!
>     I understand that I can cheat and manually configure bridge pile
>     (br-ex and br-loc both plugged to br-real, which linked to
>     physical interface), but it looks very fragile.
>     Is any nicer way to do this? And why ml2 (ovs plugin?) does not
>     allow to use mapping from many networks to one bridge?
>     _______________________________________________
>     OpenStack-operators mailing list
>     OpenStack-operators at lists.openstack.org
>     <mailto:OpenStack-operators at lists.openstack.org>
>     http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-operators
> -- 
> Kevin Benton

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