[e-nsp] Replacing a Summit48si with a Summit200-24 --> Strange problem

[F J]

Hi,
I have a strange problem related to Extreme. It involves an Alpine3804, a 
Summit48si, a Summit200-24 and a Video server (Kasenna MediaBase). I want 
the Video server to receive Multicast streams and my Extreme products are 
only working in Layer2.

When I connect my Video server directly to the Alpine I have no problem. I 
also can connect my Summit48si to my Alpine and then connect the Video 
server to the Summit48si. Still no problems.

My problem starts when I try to replace my Summit48si with a Summit200-24. 
Then it "sometimes" works.

I can always watch the Multicast streams with a PC connected to the 
Summit200-24 switch (no visible errors in the stream) but only "sometimes" 
record the Multicast streams in the Video server.

As I said, I don't have any problems recording Multicast streams when my 
Videoserver is connected directly to the Alpine or the Summit48si, only when 
the Video server is connected to the Summit200-24 which is connected to the 
Alpine.

The Summit48si and Alpine has SW 7.4 and I have tried Summit200-24 with SW 
7.1 and 7.3.

I have tried transporting the same type of Multicast streams over 
Summit200-24 switches before without any problems. I also have tried to 
temporarily move a multicast source to the same Summit200-24 switch and then 
I can receive (and always record) that particular stream in my video server.

Therefore I get the feeling I have some sort of problem between my Alpine 
card (FM-32Ti(45210) or GM-4Ti(45113)) and my Summit200-24 (fastEthernet or 
Copper-GigabitEthernet port). But why only with the Summit200-24 and not the 
Summit48si?

Has anyone experienced anything similar? Any ideas what to look for is 
appreciated, I think it seems really strange...

BR
/// Fredrik