Hi,
I'm running OVS 2.5.0 @be3f39c94, and I see duplicate multicast packets in the
following scenario.
# ovs-vsctl add-br br0
# ovs-vsctl add-port br0 bond1
# ovs-vsctl set Bridge br0 mcast_snooping_enable=true
# ovs-vsctl set Bridge br0
other_config:mcast-snooping-disable-flood-unregistered=true
Bond1 is connected to a physical switch trunk port, and 2 vlans are running
IGMPv3 queriers. So this looks as expected:
# ovs-appctl mdb/show br0
port VLAN GROUP Age
1 1725 querier 11
1 1728 querier 3
Now create a port on vlan 1725 to send multicast packets from:
# ovs-vsctl add-port br0 p1725 tag=1725 -- set Interface p1725 type=internal
# ip address add 172.17.25.25/24 dev p1725
# ip link set dev p1725 up
# ip route add 224.0.0.0/4 dev p1725
# iperf -c 226.94.1.1 -u
------------------------------------------------------------
Client connecting to 226.94.1.1, UDP port 5001
Sending 1470 byte datagrams
Setting multicast TTL to 1
UDP buffer size: 208 KByte (default)
------------------------------------------------------------
[ 3] local 172.17.25.25 port 49108 connected with 226.94.1.1 port 5001
[ ID] Interval Transfer Bandwidth
[ 3] 0.0-10.0 sec 1.25 MBytes 1.05 Mbits/sec
[ 3] Sent 893 datagrams
Tcpdump on bond1 shows that ovs forwards each multicast packet twice to bond1.
The kernel flow shows bond1 (15) twice in the action:
# ovs-dpctl dump-flows | grep 01:00:5e:5e:01:01
recirc_id(0),in_port(18),eth(src=66:d1:17:8e:c8:eb,dst=01:00:5e:5e:01:01),eth_type(0x0800),ipv4(proto=17,frag=no),
packets:893, bytes:1350216, used:3.612s,
actions:push_vlan(vid=1725,pcp=0),15,15
# ovs-dpctl show | egrep "18|15"
port 15: bond1
port 18: p1725 (internal)
The problem does not happen if there is only one VLAN running a IGMP querier.
The problem does not happen if
other_config:mcast-snooping-disable-flood-unregistered = false.
I will build and test 2.6.1 tomorrow.
Thanks,
Darragh.
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