Core switch: C1
C1 is an L3 switch--there is no router
Access switches: A1, A2, A3
VLANs: V1, V2
Hosts: H11, H12, H13, H21, H22, etc.
C1 connects to A1, A2, A3
A1, A2, A3 each support V1 and V2
A1 connects to H11, H12, H13
A2 connects to H21, H22, etc.
IGMP snooping is running on core switch and access switches.
The way access switches using IGMP snooping decide to forward multicast data to hosts is relatively obvious.
But how does IGMP snooping look from the Core's perspective? Is there a separate querier per VLAN? Are there essentially two tables (one per VLAN), and each table has zero to three rows (one entry per access switch)?