HP MSR ASM Configuration Manual page 179

If only IGMP is enabled on the router, or if both IGMP and PIM are enabled on the router, the router
•
does the following:
Maintains dynamic member ports or dynamic router ports according to IGMP packets
Maintains dynamic router ports according to PIM hello packets
If only PIM is enabled on the router, the following occur:
•
The router broadcasts IGMP messages as unknown messages in the VLAN.
After receiving a PIM hello message, the router maintains the corresponding dynamic router
port.
• If IGMP is disabled on the router, one of the following occurs:
If PIM is disabled, the router deletes all its dynamic member ports and dynamic router ports.
If PIM is enabled, the router deletes only its dynamic member ports but not its dynamic router
ports.
NOTE:
On a router with Layer-3 multicast routing enabled, use the display igmp group port-info command to
view Layer-2 port information.
If PIM is disabled on the router, one of the following occurs:
•
If IGMP is disabled, the router deletes all its dynamic router ports.
If IGMP is enabled, the router maintains all its dynamic member ports and dynamic router ports.
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