On Fri, 2003-06-27 at 13:18, Anuska Aragón Fernández wrote:
> andre.liese AT GMX DOT DE wrote:
> >>Hi all,
> >
> > Hi Anuska,
> >
> >
> >>My question is, taking into account that every packet addressed to the
> >>gateway is using as destination a multicast mac address, how to avoid
> >>these packets to be sent to every port in the switches?
> >
> > If your switches are able to learn who is on which port they don't send
> > every frame to every port. Switches can learn this by receiving IGMP
> > messages.
> > The switches's IGMP snooping feature must be enabled.
> >
> IGMP snooping is enabled, but packets still arrive to ports they
> shouldn't. Anyway, I do not know much about it but, IGMP is not related
> with ip multicast? What is the relationship between IGMP and ethernet
> multicast?
Usually, a cluster product using IP unicast/MAC multicast sends an "IGMP
membership report" when a node enters the cluster and an "IGMP leave
group" when it leaves the cluster. Of course, the IP multicast group
"reported" by the IGMP message is compatible with the MAC multicast
associated (In fact you can derive a MAC multicast from any class D IP
addresses) with the IP unicast representing the cluster.
But I don't think that Check Point is using IGMP...
Without IGMP, you can also force your switch to forward packet to the
same MAC destination through two differents ports.
>
> Greeetings,
> --
> A n u s k a A r a g ó n
> e-mail: anuska.aragon AT si.unirioja DOT es
> Tf.: +34 941 299233 Fax: +34 941 299180
>
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