[ovs-discuss] IGMP snooping/query support in Openvswitch

[Justin Pettit]

You have more ports attached to br-int than in your diagram, and they're not all on the same VLAN.  This is really more a question of how Neutron is configuring OVS than how OVS works.  Here's a page that shows how Neutron wires things up:

	http://docs.openstack.org/grizzly/openstack-network/admin/content//under_the_hood_openvswitch.html

You'll probably have better luck posting your question about how multicast works in Neutron on a Neutron mailing list.

--Justin


On Dec 10, 2013, at 8:57 PM, Taurus Cheung <Taurus.Cheung at harmonicinc.com> wrote:

> Hi Justin,
>  
> Configuration details:
> 1) The 2 VMs are running on the same OpenStack compute node (Grizzly version)
> 2) Both VMs have a virtual nic to receive multicast traffic in VLAN 1002
> 3) Openvswitch version is 1.9.0
> 4) ovs quantum plugin is configured in tenant_network_type vlan
> 5) The ovs bridge interface is eth1
> (output of "ovs-vsctl show")
>         Bridge br-int
>         Port "qvo128d8126-0c"
>             tag: 1
>             Interface "qvo128d8126-0c"
>         Port "qvof11a3165-a5"
>             tag: 2
>             Interface "qvof11a3165-a5"
>         Port "qvo0cf1ef19-80"
>             tag: 1
>             Interface "qvo0cf1ef19-80"
>         Port "qvo48fdea98-df"
>             tag: 2
>             Interface "qvo48fdea98-df"
>         Port br-int
>             Interface br-int
>                 type: internal
>         Port "qvo191216ce-02"
>             tag: 2
>             Interface "qvo191216ce-02"
>         Port "qvo5de83fb2-d4"
>             tag: 2
>             Interface "qvo5de83fb2-d4"
>         Port "int-br-eth1"
>             Interface "int-br-eth1"
>     Bridge "br-eth1"
>         Port "eth1"
>             Interface "eth1"
>         Port "br-eth1"
>             Interface "br-eth1"
>                 type: internal
>         Port "phy-br-eth1"
>             Interface "phy-br-eth1"
> 6) eth1 is physically connected to a Cisco L3 switch. That switch port is a VLAN trunk port, properly configured in VLAN group 1002. The multicast source is input from another port on the same switch.
>                  +---------------------------------+
>                  |Compute Node                     |
>                  |   +-------------------------+   |
>                  |   |VLAN 1002                |   |
>                  |   |   +-----+     +-----+   |   |
>                  |   |   |VM-A |     |VM-B |   |   |
>                  |   |   +----++     ++----+   |   |
>                  |   +--------+-------+--------+   |
>                  |            |       |            |
>                  |          +-+-------++           |
>                  |          |  br-int  |           |
>                  |   +------+----------+-------+   |
>                  |   |                         |   |
>                  |   |           OVS           |   |
>                  |   +------+----------+-------+   |
>                  |          |  br-eth1 |           |
>                  |          +-----+----+           |
>                  |                |                |
>                  +------------+---+---+------------+
>                               | eth1  |
>                               +---+---+
>                                   |
>                                   |
>                                   |
>                                   |
>                                   | Trunk port in VLAN 1002
>           +---------------------+-+-+------------------------+
>           |Cisco switch         +---+                        |
>           |                                                  |
>           |                     +---+                        |
>           +---------------------+-+-+------------------------+
>                                   |
>                                   |
>                             Multicast Source
>  
>  
> Our experiment result is “VM-B would not receive the multicast traffic joined by VM-A”.
>  
> Regards,
> Taurus
>  
> -----Original Message-----
> From: Justin Pettit [mailto:jpettit at nicira.com]
> Sent: Wednesday, December 11, 2013 11:53 AM
> To: Taurus Cheung
> Cc: discuss at openvswitch.org
> Subject: Re: [ovs-discuss] IGMP snooping/query support in Openvswitch
>  
> On Dec 10, 2013, at 7:39 PM, Taurus Cheung <Taurus.Cheung at harmonicinc.com> wrote:
>  
> > That's good my understanding is correct.
> >
> > Although OVS doesn't support IGMP snooping, could I know what underlying mechanism in OVS result in "VM-B would not receive the multicast traffic joined by VM-A"?
>  
> How's it configured?  Did you install any flows or VLANs?  Anything else that may affect configuration?
>  
> --Justin