[ovs-discuss] Tenant multicast traffic on OpenStack with OVN

O'Reilly, Darragh darragh.oreilly at hpe.com
Fri Sep 8 11:06:03 UTC 2017

Hi Tom,

I can confirm that multicast works very well with Neutron ML2/OVS provider networks. See https://gist.github.com/djoreilly/a22ca4f38396e8867215fca0ad67fa28

I don’t know about OVN and multicast.


From: ovs-discuss-bounces at openvswitch.org [mailto:ovs-discuss-bounces at openvswitch.org] On Behalf Of Tom Verdaat
Sent: 08 September 2017 10:26
To: ovs-discuss at openvswitch.org
Subject: [ovs-discuss] Tenant multicast traffic on OpenStack with OVN

Hi all,
I've been looking into how we can enable multicast traffic for our OpenStack tenants. We once had this on an old OpenStack release that was using nova-networking and a flat network, but lost this when moving to a Neutron provider networking setup. Apparently - according to Cisco - it doesn't work with a regular Neutron ML2 + OVS setup due to what the neutron L3 agent does with namespaces and iptables.

In reply to an audience questions about it during the Boston OpenStack Summit talk on OVN somebody mentioned that OVS can handle multicast traffic just fine and that this means using OVN it could, potentially, also work for tenants. So with the new OpenStack Pike release, OVN active/passive HA support making it suitable for production and OVN doing away with all the Neutron agents (including the L3 agent?) things are looking up. Just wondering if anyone could tell me:

Would multicast work when using Neutron with OVN?

If so, would it work with provider networks, flat networking, or both?

Any insights into the state of multicast supoprt is greatly appreciated!

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