From: Carlos Trujillo (carlos.trujillo.jimenez@gmail.com)
Date: Wed Apr 09 2008 - 10:14:01 ART
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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