With IGMP snooping enabled on a pure Layer 2 local network, if the network doesn't include a multicast router, multicast traffic might not be properly forwarded through the network. You can solve this problem by configuring one of the devices as an IGMP querier. The IGMP querier device sends periodic general query packets to all the devices in the network. This configuration ensures that the snooping membership tables are updated and prevents multicast traffic loss.