igmp multicast problem on 3com switches

[Migration User]

Hello,

 

Can anyone help me with the following issue?

 

My network contains multiple 3com4400 switches with workstations attached to.

These switches are connect by fiber to a 3com5500 switch (Core)

We also got one HP5304XL with most servers connected to. The HP is by a copper trunc connected to the 3Com5500

Our ghost server is direct plugged on the 3Com5500

The server and workstations are on the same vlan(16)

 

I need to get my multicast working in order to image our workstations.

On every switch we have igmp spoofing switched on. (on the 5500 only no the switch, not on the vlan16)

 

The issue i got now is when ik disable igmp spoofing on a 3com4400, multicast works fine. But this restults in a multicast to all switchports instead of only the ports that need the multicast traffic.

When i enable igmp spoofing on a 3com4400 the ghostsession will be found, but no traffic will be passed to the client (clone will nog start)

 

I hava read i need an igmp quirer and in my understanding its the best idea the 3com5500 should be the one, however i dont know how to enable that (on 3com4400 its a simple cli command witch isnt there on the5500)

 

Does anyone how to solve this issue and (if its the sollution) how to get the 3com5500 to become the igmp carrier?

 

 

 

[Migration User]

In my post where i wrote "spoofing", i meant "snooping" of course..

[Migration User]

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I hava read i need an igmp quirer and in my understanding its the best idea the 3com5500 should be the one, however i dont know how to enable that (on 3com4400 its a simple cli command witch isnt there on the5500)

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Yes, you need an IGMP querier; you have to have one for the end nodes (i.e., client machines) in the network to reply to the queries, because otherwise there aren't renewals of the IGMP memberships (sent in response to the queries) for the switch to snoop.

IGMP queries are supposed to be generated by routers (since actually the original point of the IGMP protocol is to allow routers to generate efficient spanning trees), so whatever device you have providing routing services to the subnet is the "ideal" device to be generating the queries. You would normally only enable query generation in a switch if you don't have any router, or of course if the switch contains a module which is also doing your routing.

As for the 5500, a few seconds of searching at the 3Com documentation website turned up this index of documentation. You don't describe a particular submodel in the line but the IGMP commands are described on page 407 of the 5500 family configuration guide.

Message Edited by Nigel Bree on 01-10-2009 02:36 PM