Brocade Multi-Service IronWare Multicast Configuration Guide (Supporting R05.6.00) - Manual (Page 39)

Multi-Service IronWare Multicast Configuration Guide 27
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PIM Dense
1
Grafts to a multicast tree
A PIM device restores pruned branches to a multicast tree by sending graft messages towards the
upstream device. Graft messages start at the leaf node and travel up the tree, first sending the
message to its neighbor upstream device.
In the example above, if a new 229.255.0.1 group member joins on device R6, which was
previously pruned, a graft is sent upstream to R4. Since the forwarding state for this entry is in a
prune state, R4 sends a graft to R1. Once R4 has joined the tree, R4 along with R6 once again
receive multicast packets.
Prune and graft messages are continuously used to maintain the multicast delivery tree. No
configuration is required on your part.
PIM DM versions
The Brocade device supports PIM DM V1 and V2. The default is V2. You can specify the version on
an individual interface basis.
The primary difference between PIM DM V1 and V2 is the methods the protocols use for
messaging:
• PIM DM V1 – uses the IGMP to send messages.
• PIM DM V2 – sends messages to the multicast address 224.0.0.13 (ALL-PIM-ROUTERS) with
protocol number 103.