We have a router with 3 subinterfaces
sub 100 for PC's
sub 200 for Phones
sub 300 for Call manager
This links to a Cisco 3560 (no routing) trunked.
On this 3560 we have a wireless access point and 3 PC's. The wireless access point has 2 wireless handheld devices that are used to connect to vehicles for diagnostics. The PC's (hard wired) run an application that are able to connect to the handheld devices and pull information into a report in the PC's application. Here is what our problem is and mind you I know some about multicast on a network however not entirely sure how this application works and who the sender/reciever is.
If we disable IP IGMP SNOOPING on the switch we are able to see the handheld devices. With IGMP snooping on, we cannot see the handheld devices during the discovery when the application is fired up.
Whats odd is the PC's (hardwired) and the access point are all on the same switch and VLAN 100.
All sub interfaces on the routers have ip pim sparse-dense-mode enabled and ip multicast routing is enabled on the router as well.
I have been attempting to troubleshoot the problem but having a hard time determining where to start or to even know what the problem may be. I suspect the developer of this application has done something wrong as disabling igmp snooping on a switch shouldn't be needed to make this work.
If you want output please let me know.
yes the AP can pass IGMP vers 2 packets they are multicast frames
And yes enabling IGMP version3 on the switch (and on the multicast router if it is a different device) can be a solution
Hope to help