[e-nsp] Summit450X - strange IGMP-snooping on port connected to Linux server?

[F J]

Hi,
I am using a Summit450X as a layer2 switch in my multicast network. 
I am using PIM SM on my routers and I am running IGMP snooping on my layer2 switches.

On this 450X-switch I have a HP server runnning Linux connected to port 21.

When running some show commands (see below) it looks like the switch thinks that the 
server is a router? And that it should get all Multicast streams? 

Can anyone explain what is causing this? 
Is my switch misconfigured or is my server doing something strange?
What is the criteria for being listed as a router by the switch?

Port 45 is connected to the closest router.

Any ideas of what could be causing this kind of behaviour is appreciated!

Best Regards
Fredrik

X450a-48tdc.19 # sh igmp snooping 
Vlan             Vid  Port   #Senders #Receivers Router Enable
-------------------------------------------------------------- 
SN102          164         6                          Yes 
                      19               2         No
                      20               5         No
                      21               3         Yes
                      45               0         Yes

VLAN SN102          (164) Snooping=Enabled  
    Group           Sender          Age  
    239.1.1.1       10.21.65.5      14   
    239.1.1.2       10.21.65.5      10   
    228.0.198.75    10.21.64.4      25   
    228.0.198.76    10.21.64.4      13   
    228.0.198.77    10.21.64.4      13   
    5 Incoming multicast streams 

    Port   Host            Subscribed        Age    
    19     10.21.64.2      225.10.10.10      66     
    19     10.21.64.2      226.10.10.10      63     
    20     10.21.64.3      224.2.127.254     67     
    20     10.21.64.3      224.2.127.255     69     
    20     10.21.64.3      234.5.6.7         63     
    20     10.21.64.3      239.1.1.1         64     
    20     10.21.64.3      239.1.1.2         61     
    21     10.21.64.4      228.0.198.75      68     
    21     10.21.64.4      228.0.198.76      63     
    21     10.21.64.4      228.0.198.77      60     
    21     10.21.64.4      All Groups        69     
    45     10.21.64.1      All Groups        1      



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