I don't know how to configure IGMP on one interface as the command "IP pim ..." is not available on routers 857w.
Can someone help with it?
Hi, you can ignore random comment about switch es, anyway is correct to state that the 85x does not support pim like many other advance protocols, but this is a product limitation, not due to the 85x being old, as they are not.
You need a minimum of an 87x and possibly advanced IP service image to do that you're asking for.
Hope this helps, please rate post if it does!