Hi folks,

I was asked for an example dump of an openstack config on ovsdb netvirt and how one can piece mail the ovs ports

to the overlay network that goes with it.

For that, I ‘devstacked' 3 nodes using my one trick pony github [1] repo. ;)

Then, I created 2 tenants with 2 internal subnets and put 2 vms in each with floating ips.

The output of operational tree using my handy tool [3] looked like this [4] ([5] with flows).

The output from neutron’s rest interface gave me this [6].

Pulling the string for a tenant port in openstack compute node 192.168.50.22 —as an example-- you can see that:

* lines 14, 15, 30, 31, 37 and 40 from [4] represent the tunnel ports that interconnect the openstack nodes

* line 42 from [4] is:  of:6   tapbd8efa88-36   mac:fa:16:3e:fb:d9:bf   ifaceId:bd8efa88-3665-409a-a7fa-47663a9089b2.

 So, the tenant vm that owns that port is in compute node 192.168.50.22. 

  br-int in that node is aka openflow:191757013640004 (charlie)

  If you search for ‘47663a9089b2’ in [6], you will find it belongs to neutron port that has address 10.20.0.3 and

  belongs to subnet id 8daa2590-67d9-45c1-b956-f820aa5dba43. That is on line 691 of [6].

  Furthermore you can see that it belongs to tenant 33d676feac934d98a809eadfd8e5e985, mentioned in line 702.

 

* with that, you can connect the dots and find all neutron ports that belong to a certain subnet / tenant, as well as the bridge

  and openstack nodes they are located.

These where the curl commands that dumped me the crud tables in neutron northbound [7]. I’m pretty sure that can be obtained

via mdsal’s restconf too, but I am not too familiar with that yet.

Hope this helps. :)

— flavio

[1]:  https://github.com/flavio-fernandes/devstack-nodes

[2]: https://gist.github.com/2b3aca972ee689d31560

[3]: https://lists.opendaylight.org/pipermail/ovsdb-dev/2015-July/001698.html

[4]: https://gist.github.com/63efbecd91c630ff7374

[5]: https://gist.github.com/c0326ba0787e02c1f4a1

[6]: https://gist.github.com/77fe6c73427bcede09dd

[7]: curl -u admin:admin http://192.168.50.1:8080/controller/nb/v2/neutron/networks

      curl -u admin:admin http://192.168.50.1:8080/controller/nb/v2/neutron/subnets

      curl -u admin:admin http://192.168.50.1:8080/controller/nb/v2/neutron/ports

===

$ ./showOvsdbMdsal.py -f

aliasMap:
  alpha      -> openflow:50647211443526
  bravo      -> openflow:8796758886516
  charlie    -> openflow:191757013640004
  delta      -> openflow:8796757453186
  echo       -> openflow:68498488746567
  foxtrot    -> openflow:8796764052230
 
ovsdbNode:192.168.50.20:47988 mgr:192.168.50.1:6640 version:2.3.2
  alpha:br-int
    of:1 tap165bbfcf-50 mac:fa:16:3e:43:d0:5f ifaceId:165bbfcf-50ec-4e33-b978-5e2310097403
    of:2 patch-ext
    of:3 vxlan-192.168.50.21
    of:4 vxlan-192.168.50.22
    of:5 tap207df591-ca mac:fa:16:3e:97:c3:a5 ifaceId:207df591-ca7f-4da3-b156-5af408b14ac7
    of:6 tapce6a55b8-6f mac:fa:16:3e:bd:aa:21 ifaceId:ce6a55b8-6f6b-419a-814c-7075f22d0fe3
    of:7 tap79cb76bd-d9 mac:fa:16:3e:b3:52:57 ifaceId:79cb76bd-d959-44bf-b203-1af6f55def8d
    of:8 tap412bb62b-48 mac:fa:16:3e:8a:5c:3b ifaceId:412bb62b-48ba-454e-b370-207fd550f12b
    of:9 tap5f960323-fc mac:fa:16:3e:b8:26:17 ifaceId:5f960323-fcaa-4b6a-aea7-f25c579fa909
    of:10 tape713da3b-5e mac:fa:16:3e:83:11:af ifaceId:e713da3b-5e04-4496-b5a4-14aa8ebcd5f9
  bravo:br-ex
    of:1 eth2
    of:2 patch-int
ovsdbNode:192.168.50.21:51445 mgr:192.168.50.1:6640 version:2.3.2
  delta:br-ex
    of:1 eth2
    of:2 patch-int
  echo:br-int
    of:1 vxlan-192.168.50.20
    of:2 vxlan-192.168.50.22
    of:3 tap055b988d-4e mac:fa:16:3e:50:48:1c ifaceId:055b988d-4e4c-48f9-a479-50b725c10655
    of:4 patch-ext
    of:5 tap70290b63-bc mac:fa:16:3e:18:1c:64 ifaceId:70290b63-bc50-4191-bf00-55f1b9794ef8
ovsdbNode:192.168.50.22:52843 mgr:192.168.50.1:6640 version:2.3.2
  charlie:br-int
    of:1 vxlan-192.168.50.20
    of:2 tapbce1a32b-3b mac:fa:16:3e:92:06:83 ifaceId:bce1a32b-3b4b-4ba1-a05b-b157989abccb
    of:3 patch-ext
    of:4 vxlan-192.168.50.21
    of:5 tap2c38c301-52 mac:fa:16:3e:2c:6b:e0 ifaceId:2c38c301-526a-49b0-b4d6-5c74cb7e5c22
    of:6 tapbd8efa88-36 mac:fa:16:3e:fb:d9:bf ifaceId:bd8efa88-3665-409a-a7fa-47663a9089b2
  foxtrot:br-ex
    of:1 eth2
    of:2 patch-int
 
ofLinks (discover via lldp):
  charlie:1 <-> alpha:4
  charlie:3 <-> foxtrot:2
  charlie:4 <-> echo:2
  alpha:2 <-> bravo:2
  alpha:3 <-> echo:1
  echo:4 <-> delta:2
  delta:1 -> bravo:1
  bravo:1 <-> foxtrot:1

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