Operation with or without IP addressing

You can configure IGMP on VLANs that do not have IP addressing. Using IGMP without IP addressing reduces the number of IP addresses you use and configure, significant in a network with many VLANs. The limitation on IGMP without IP addressing is that the switch cannot become querier on any VLANs for which it has no IP address; thus the network administrator must ensure that another IGMP device acts as querier. Hewlett Packard Enterprise also advises that an additional IGMP device be available as backup querier.

Comparison of IGMP operation with and without IP addressing
IGMP Function available with IP Addressing configured on the VLAN	Available without IP Addressing?	Operating Differences without an IP Address
Forward multicast group traffic to any port on the VLAN that has received a join request for that multicast group.	Yes	None
Forward join requests (reports) to the querier.	Yes	None
Configure individual ports in the VLAN to Auto (the default) Blocked, or Forward.	Yes	None
Configure IGMP traffic forwarding to normal or high-priority forwarding.	Yes	None
Age-Out IGMP group addresses when the last IGMP client on a port in the VLAN leaves the group.	Yes	Requires that another IGMP device in the VLAN have an IP address and can operate as querier. This can be a multicast router or another switch configured for IGMP operation. Hewlett Packard Enterprise recommends that the VLAN also include a device operating as a backup querier in case the device operating as the primary querier fails.
Support Fast-Leave IGMP (below) and Forced Fast-Leave IGMP.	Yes
Support automatic querier election.	No	Querier operation not available.
Operate as the querier.	No	Querier operation not available.
Available as a backup querier.	No	Querier operation not available.