Solved

3Com SuperStack 4400 IGMP snooping settings

Posted on 2008-10-20
6
2,261 Views
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.
0
Comment
Question by:brushhead1971
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 3
6 Comments
 
LVL 13

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.
0
 

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
0
 
LVL 13

Expert Comment

by:kdearing
ID: 22767644
What multicast specifically are you seeing? What IP?
0
Manage your data center from practically anywhere

The KN8164V features HD resolution of 1920 x 1200, FIPS 140-2 with level 1 security standards and virtual media transmissions at twice the speed. Built for reliability, the KN series provides local console and remote over IP access, ensuring 24/7 availability to all servers.

 

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.
0
 
LVL 13

Accepted Solution

by:
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?
0
 

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.
0

Featured Post

Threat Trends for MSPs to Watch

See the findings.
Despite its humble beginnings, phishing has come a long way since those first crudely constructed emails. Today, phishing sites can appear and disappear in the length of a coffee break, and it takes more than a little know-how to keep your clients secure.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

So, you're experiencing issues on your network and you've decided that you need to perform some tests to determine whether your cabling is good.  You're likely thinking that you may need to spend money which you probably don't have on hiring/purchas…
Before I go to far, let's explain HA (High Availability) and why you should consider it.  High availability is the mechanism used to provide redundancy to any service at the same site and appears as a single service to the users of that service.  As…
Get a first impression of how PRTG looks and learn how it works.   This video is a short introduction to PRTG, as an initial overview or as a quick start for new PRTG users.
Here's a very brief overview of the methods PRTG Network Monitor (https://www.paessler.com/prtg) offers for monitoring bandwidth, to help you decide which methods you´d like to investigate in more detail.  The methods are covered in more detail in o…

752 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question