[c-nsp] multicast on layer 2

[Tim Stevenson]

You might try:
* enabling PIM on an SVI in that VLAN
* enabling the IGMP querier feature
* disabling IGMP snooping (not really advisable, floods to all ports)

For IGMP snooping to work properly, an IGMP querier MUST be present in the 
VLAN.

See:
http://www.cisco.com/warp/public/473/38.html

HTH,
Tim

At 12:28 PM 6/24/2005, Andrew K Ho declared:
>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
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Tim Stevenson, tstevens at cisco.com
Routing & Switching CCIE #5561
Technical Marketing Engineer, Catalyst 6500
Cisco Systems, http://www.cisco.com
IP Phone: 408-526-6759
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