How many switches should be set as IGMP Querier when configuring IGMP Snooping?

When configuring IGMP Snooping in a network, only one switch should be set as the IGMP Querier. The role of the IGMP Querier is to send periodic IGMP Query messages to ensure that multicast group members can inform the network about their memberships. If there are multiple IGMP Querier switches in the same network, it can create confusion and potentially duplicate queries, leading to inefficient multicast traffic management and misunderstandings regarding group memberships among switches.

Designating a single IGMP Querier eliminates the potential for conflicts and ensures that the multicast management is handled in a clear, organized manner. This setup allows the switch to effectively manage multicast flows and optimize bandwidth usage for multicast traffic across the network. Thus, having only one Querier leads to more reliable and stable IGMP Snooping behavior.