Subject: [magma] IGMPv2 Snooping and Border routers environment

From: "KIMBALL,KAREN (HP-Roseville,ex1)" <[email-masked]>
Date: Thu, 16 Oct 2003 12:52:25 -0400

> Probably it is a problem already solved or discussed.
> 
> Using a HP 2524 switch and configuring IGMP snooping as usual.
> The switch is connected only to routers at the borders of 4 
> different domain.
> 
> Multicast traffic between two domains is forwarded by the 
> switch on every port
> connected. That is broadcast.
> IGMP group is not recorded in the switch memory to let this snoop.

IGMP snooping requires that switches forward ALL multicast traffic toward
routers and the IGMP querier.

If the routers send the multicast traffic to a switch and there is another
router (or more) connected to the switch, that traffic will be forwarded.

Why is the router sending the multicast traffic if there are no joined
members
out of its domain?

You probably want this switch closer to your network edge, and not as a
router interconnection, if you are doing IGMP snooping.

Thanks,
	Karen Kimball

> Is there something I am missing or this kind of environment 
> could not be used
> for multicast?

_______________________________________________
magma mailing list
[email-masked]
https://www1.ietf.org/mailman/listinfo/magma