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Hello Community,

Current portgroup scenario is not fully clear for me. The related spec [3]
doesn't clearly describe it. And based on implementation [1] and [2] I
guess it should work in the following fashion for node with 3 NICs, where
eth1 and eth2 are members of Porgroup Po0/1

Node network connection info:
eth1 (aa:bb:cc:dd:ee:f1) <---> Gig0/1
eth2 (aa:bb:cc:dd:ee:f2) <---> Gig0/2
eth3 (aa:bb:cc:dd:ee:f3) <---> Gig0/3

For FLAT network scenario:
1. Administrator enrol ironic node.
2. Administrator creates a 3 ports for each interface, and a portgroup that
contains eth0 and eth1 ports.
3. The ports Gig0/1 and Gig0/2 are added to portgroup Po0/1 manually on the
switch.
4. When user request to boot an instance, Nova randomly picks interface
[2], it might be a portgroup or single NIC interface. Proposed change [1]
do not allow to specify what exactly network type we would like to use
single NIC or portgroup.

For multitenancy case:
All looks the same, in addition administrator adds local_link_connection
information for each port (local_link_connection 'port_id' field is
'Gig0/1' for eth1, 'Gig0/2' for eth2 and 'Gig0/3' for eth3, ). Ironic send
this information to Neutron who plugs ports to needed network.

The same user-scenario is available at the moment without any changes to
Nova or Ironic. The difference is that administrator creates one port for
single interface eth3 with local_link_connection 'port_id'='Gig0/3',  and a
port that is a logical representation of portgroup (eth1 and eth2) with
local_link_connection 'port_id'='Po0/1'.

Please let me know if I've missed something or misunderstood current
portgroup scenario.

Reference:
[0] https://review.openstack.org/206163
[1] https://review.openstack.org/332177
[2]
https://github.com/openstack/nova/blob/06c537fbe5bb4ac5a3012642c899df815872267c/nova/network/neutronv2/api.py#L270
[3]
https://specs.openstack.org/openstack/ironic-specs/specs/not-implemented/ironic-ml2-integration.html
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