[ovs-discuss] Open vSwitch and multicast question

Gianluca Cecchi gianluca.cecchi at gmail.com
Fri Aug 10 16:32:14 UTC 2012


Thanks for confirmation.
So i have to investigate instead with iptables rules that were in place
with standard bridges and now I have to translate them with Open vSwitch
and brcompat
Il giorno 10/ago/2012 18:15, "Ben Pfaff" <blp at nicira.com> ha scritto:

> On Fri, Aug 10, 2012 at 12:58:31PM +0200, Gianluca Cecchi wrote:
> > Hello,
> > having two nodes with CentOS 6.3, each one with Open vSwitch 1.6.1.
> > On each node there is a vm and I want to make an RHCS cluster between
> > these two virtual machines cross hosts.
> >
> > At this moment I have on each host something like this
> >     Bridge "br0"
> >         Port "brvlan65"
> >             tag: 65
> >             Interface "brvlan65"
> >                 type: internal
> >         Port "vnet2"
> >             tag: 65
> >             Interface "vnet2"
> >         Port "vnet0"
> >             tag: 66
> >             Interface "vnet0"
> >         Port "brvlan66"
> >             tag: 66
> >             Interface "brvlan66"
> >                 type: internal
> >         Port "bond0"
> >             trunks: [65, 66]
> >             Interface "eth3"
> >             Interface "eth2"
> >         Port "br0"
> >             Interface "br0"
> >                 type: internal
> >
> > Where:
> > vnet0 is the network adapter of the VM on production network (eth0 for
> the VM)
> > vnet6 is the network adapter of the VM on intracluster network (eth1 for
> the VM)
> >
> > virtual machines are able to ping each other through the intracluster
> > interface (using -I option of ping), but are not able to make the
> > cluster.
> > I suspect it could depend on multicast messages not passing between them.
>
> What makes you suspect that?
>
> Open vSwitch treats multicast the same as broadcast.  ARP uses
> broadcast, so if the machines can talk to each other over IP (without
> statically configured MAC addresses) then it's unlikely that OVS is
> causing trouble with multicast.
>
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