Grafts to a multicast tree – Brocade FastIron Ethernet Switch IP Multicast Configuration Guide User Manual
Page 86
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 preceding example, 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. You do not
need to configure anything.
Grafts to a multicast tree
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FastIron Ethernet Switch IP Multicast Configuration Guide
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