[Rdo-list] Multicast does not work with ML2/VxLAN

[Zhang, Kimi (NSN - FI/Espoo)]

Hi, 

I am trying ML2/VXLAN on RDO Havana 2013.2.2 on CentOS 6.5 in a 3-nodes setup. OVS version is 1.11.0.

I enable multicast by setting vxlan_group = 239.1.1.1 in  /etc/neutron/plugins/ml2/ml2_conf.ini.

But from the tcpdump, I find the VM broadcast traffic still goes via multiple unicast packages between OVS agent nodes.  

How to make that multicast really work ?

My ml2_confi.ini:
[ml2]
type_drivers = vxlan
tenant_network_types = vxlan
mechanism_drivers = openvswitch
[ml2_type_flat]
[ml2_type_vlan]
[ml2_type_gre]
[ml2_type_vxlan]
vni_ranges = 1001:2000
vxlan_group = 239.1.1.1
[database]
sql_connection = mysql://neutron:83105f1d6ded47cc@10.142.0.101/neutron_ml2
[securitygroup]
firewall_driver = dummy_value_to_enable_security_groups_in_server

My ovs_neutron_plugin.ini on every OVS agent node:
[OVS]
vxlan_udp_port=4789
tunnel_type=vxlan
tunnel_id_ranges=1001:2000
tenant_network_type=vxlan
local_ip=10.142.255.101  #This varies on different node
enable_tunneling=True
[AGENT]
tunnel_types = vxlan
polling_interval=2
[SECURITYGROUP]
firewall_driver=neutron.agent.linux.iptables_firewall.OVSHybridIptablesFirewallDriver


Kimi