From: Thor Kopp (thorkopp@googlemail.com)
Date: Wed Apr 09 2008 - 16:27:21 ART
Hello Carlos, thank you very much for your explanation.
Best Regards - Thor
On Wed, Apr 9, 2008 at 2:14 PM, Carlos Trujillo <
carlos.trujillo.jimenez@gmail.com> wrote:
> Igmp Snooping operates different in a switch than MVR.
> In igmp snooping the switches continously listen to the mulicast streams
> between the multicast router and clients attached to its ports, so it builds
> a multicast mac-address table, and continously update, delete, change ports
> depending if the clients join or leave a multicast stream.
> While MVR is build for another purpose: In a switching plataform *Provides
> Inter-Vlan Multicast services* *(forwarding multicast traffic between
> different vlans without the use of a router)* and without enabling
> multicast Routing too!.
>
> MVR allows suscribers connected to a separate VLAN than the MULTICAST VLAN
> to recibe multicast traffic when they *JOIN-IT (via IGMP JOINS).*
> By enabling MVR the switch listen for a the destination multicast ip
> address of the streamead packets in the MULTICAST VLAN, and it changes the
> physical mac-address (when required) so those streams can be sent to a
> different vlan where multicast recibers are locted.
>
>
> 2008/4/9, Thor Kopp <thorkopp@googlemail.com>:
> >
> > Hello GS,
> >
> > Can someone explain how IGMP Snooping differ from MVR and when we would
> > use
> > MVR? My CD say 'It allows the single multicast VLAN to be shared in the
> > network while subscribers remain in separate VLANs. MVR provides the
> > ability
> > to continuously send multicast streams in the multicast VLAN, but to
> > isolate
> > the streams from the subscriber VLANs for bandwidth and security
> > reasons.'
> >
> > Could we use 'ip igmp access-group' to restrict group that ports receive
> > traffic from or use 'ip multicast boundry' to restrict what multicast
> > traffic go out interface. But then I think that igmp access-group and
> > multicast boundry are L3 commands that we would put on router interface
> > and
> > MVR acts at L2 on our switch to prevent traffic so still unsure.
> >
> > Best Regards - Thor
> >
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