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3Com SuperStack 4400 IGMP snooping settings

Posted on 2008-10-20
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Last Modified: 2013-11-10
Hi,
I have got hold of a 3 Com 4400 48 port Managed Switch.  I am trying to multicast stream Video and Radio from a DVB-s onto my local network.  I can stream this onto my Network without a problem apart from the fact that it takes down my router and VOIP phones because they do not like the Multicast traffic.

I got this switch in order to filter out these Multicast stuff, except to those which had registered as a Multicast subscriber.

What I really need help with is how to set the Switch up as to filter out Multicast.

Can anyone help please?

Thanks,

Rob.
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Question by:brushhead1971
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Expert Comment

by:kdearing
ID: 22764277
Enabling and Disabling IGMP Snooping-

You can enable or disable IGMP Snooping for all Switch units in the stack using the IGMP command on the Multicast Filtering menu.

To enable or disable IGMP Snooping:

At the Top-level menu, enter:
    bridge multicastFilter igmp snoopMode

The following prompt is displayed:
    Enter new value (enable, disable) [enable]:
    Enter enable or disable.
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Author Comment

by:brushhead1971
ID: 22765171
Hi,
Snooping appears to be turned on.  Am I understand Snooping properly because I am still seeing this Multicast all over my network.

Regards,

Rob.
4400-cap.GIF
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LVL 13

Expert Comment

by:kdearing
ID: 22767644
What multicast specifically are you seeing? What IP?
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Author Comment

by:brushhead1971
ID: 22813867
Hi,
I am beginning to think that I have another switch on the network that seems to be causing the network to fall over, or rather one specific bit.  I will do some more testing and report back.  I thought that the opint of IGMP snooping was to stop unnecessary traffic from apperaing, ie, to tpoint that had not registered as being part of the Multicast group.

Rob.
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Accepted Solution

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kdearing earned 125 total points
ID: 22814769
IGMP Snooping blocks multicast traffic from flooding all ports of the switch (or VLAN). It allows the multicast only to those switchports that have received a Join message for that specific multicast group.

What specific multicast IP are you trying to inject into your network?
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Author Comment

by:brushhead1971
ID: 22958920
Hi,
Thanks kdearing, you gave me enough to start a new thought thread.  I did some Googling onn Multicast addresses, and you were right to ask what address I was using.  I was passing everything onto nttwork as 224.0.0.1, 224.0.0.2 and so on.  I had not appreciated that this would be ignored by the Switch, because it is intended to flod the network.

I am now using 239.0.01 etc etc and the switch now blocks Multicast traffic as I had imagined it would.

Thanks a lot.
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