[Xorp-users] IGMP report group ...?

[Pavlin Radoslavov]

Hervé Léonard <lherve at interfaceconcept.com> wrote:

> 
> Thank you very much Pavlin and Bruce for your answers. I took your advices
> and tried to go further...
> 
> In fact, in my first configuration, i did not have the mfea statement (see
> my first mail):
> 
> 	plumbing mfea4 interface eth0 vif eth0...

You must have the mfea statement in your config for all the
IGMP and PIM-SM enabled interfaces (incl. "interface register_vif");
it was an oversight on my side that I didn't notice that in your
original email.

> but only the IGMP configuration statement:
> 
> 	protocols igmp interface eth0 vif eth0
> 
> 
> But the flag ALLMULTI is set on the interface by the option MRT_ADD_VIF
> using setsockopt() passed to the kernel.
> And setsockopt(MRT_ADD_VIF) is done in mfea_mrouter.cc
> 
> is that correct?

Yes.

Pavlin

> Anyway, IGMP version 2 WITHOUT the mfea configuration statement for eth0 it
> doesn't work but WITH the mfea configuration, it does:  the IGMP group
> appears in xorp.
> 
> 
> Thanks,
> Leonard
> 
> 
> -----Message d'origine-----
> De : Pavlin Radoslavov
> Envoyé : mardi 7 octobre 2008 19:01
> À : Hervé Léonard
> Cc : xorp-users at xorp.org
> Objet : Re: [Xorp-users] IGMP report group ...?
> 
> 
> Hervé Léonard <lherve at interfaceconcept.com> wrote:
> 
> >
> > Hi,
> >
> > In fact, i do some other tests...
> >
> > The flag 'ALLMULTI' for the network card driver (in ifconfig) was not the
> > root cause of the group membership in xorp router.
> >
> > It was in fact the IGMP version number for the interface in Xorp
> > configuration.
> >
> > With the IGMP version 2 (by default) the IGMP membership doesn't work. But
> > with version 3, it does.
> >
> > I thought that only one router on the LAN can send IGMP Query, it is the
> > Querier IGMP. And this Querier IGMP should deal with 3 versions of IGMP
> for
> > all different kinds of hosts on the LAN...
> >
> > Is that the case with Xorp?
> 
> Few things:
> 
> * Yes, only the elected Querier should send IGMP Query messages.
> * If the Querier is configured for IGMPv3, it should deal with all
>   IGMP control messages from other routers and hosts: IGMPv1,
>   IGMPv2, IGMPv3.
>   The XORP IGMPv3 router-side implementation supports that.
> * If the Querier is configured for IGMPv2, the IGMPv3 hosts MUST
>   operate in IGMPv2 compatibility mode. If they don't, then you need
>   to find the root cause for that: is it on the host side (e.g., the
>   host IGMP implementation) or are there some other factors (e.g.,
>   firewall entries on either the host or the router side as I
>   mentioned in my earlier email on the subject).
> * Setting the XORP IGMP version to 3 is a perfectly acceptable
>   solution. In the future IGMPv3 and MLDv2 will become the default
>   configuration for XORP.
> 
> Pavlin
> 
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