[c-nsp] multicast on layer 2

[Andrew K Ho]

Hi, I was hoping someone could help me on this. 

I'm having a problem with an application on our network called Drive Image 
Pro (used to push pc images to build client machines), which purports to 
be a multicast application, but which is only being used at layer 2 as all 
traffic btn server and client  is contained in 1 vlan, hence is working 
essentially the same as broadcasts.  Howevever, the server and client send 
multicast packets to a multicast address to send packets. 

The server is connected to  Model / Serial cisco WS-C6509  OS / Version 
ios / 12.1(22)E2 on a 100m connection and the client is connected to a 
100m port on  Model / Serial cisco 4506  OS / Version ios / 12.2(20)EW . 
They are connected directly through a trunk link, running at gig on fiber. 
 The server and  client are pingable from either side so there is no 
reachability issue.

If the server and client are both on the 4506, it works fine, but won't 
work if connected as described above.  There are no configs affecting 
multicast packets.

Has anyone come across a problem like this or have any clue as to why it 
may not be working?

Thx in advance

Andy