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The routing switch supports 2048 multicast flows in hardware. See,Flow capacity.
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The multicast routing table (MRT) that PIM-DM creates allows up to 128 outbound VLANs at any given time. PIM-DM supports multicast routing across 128 VLANs.
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The routing switch allows one instance of PIM per VLAN. For networks using multinetted VLANs, all routers on the intended VLAN must have at least one common subnet if you intend on routing multicast packets. The routing switch provides a command for specifying which IP address PIM will use on each VLAN.
A PIM router without a state-refresh messaging capability learns of currently active flows in a multicast network through periodic flood and prune cycles on the path back to the source. The switches covered in this guide sense downstream multicast routers that do not have the state-refresh capability and will periodically flood active multicast groups to these devices. This periodic flooding is not necessary if all downstream multicast routers are switches covered in this guide. (The HPE routing switch Series 9300 and the routers offered by some other vendors do not offer the state-refresh capability.)
The routing switch provides an ample multicast environment, supporting 2048 multicast flows in hardware across a maximum of 64 VLANs. (A flow comprises a unicast source address and a multicast group address, regardless of the number of active hosts belonging to the multicast group at any given time.)
Enabling IP multicast routing to support PIM-DM operation has the effect of disabling IGMP traffic high-priority, if configured.
The switch allows ACL filtering on unicast addresses, but not on multicast addresses. Also, an ACL does not take effect on a flow if the flow began before the ACL was configured.