The configuration explicitly contains ip igmp version 2 , which overrides the normal AOS-CX IGMP version selection for this Layer 3 VLAN interface. HPE Aruba Networking documents the default IGMP version as IGMPv3 . The ip igmp version < VERSION > command permits either version 2 or version 3, and removing the explicit version configuration restores the interface to the default of IGMPv3 . Therefore, configuring version 2 represents a custom, non-default IGMP version , making option D correct. Aruba Networks
The commands have separate multicast functions. ip igmp enable enables IGMP operation on VLAN 2222 so the Layer 3 interface can process multicast membership information from attached receivers. ip pim-sparse enable enables PIM Sparse Mode on that routed interface, allowing the switch to participate in multicast routing and build multicast distribution trees toward other PIM routers. HPE Aruba configuration examples show PIM-SM and IGMP enabled together on receiver-facing routed interfaces. Aruba Networks
PIM is therefore not a requirement for ordinary Layer 2 multicast forwarding , and neither is it required merely to perform generic local Layer 3 unicast routing. Its role is specifically multicast routing between Layer 3 interfaces .
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