Configuring IP Multicast Protocols
Video Conferencing
Server
(207.95.5.1, 229.225.0.1) (Source, Group)
229.225.0.1 | 229.225.0.1 |
| ||
Group | Group | Group | Group | Group |
Member | Member | Member | Member | Member |
R2R1
Leaf Node
Prune Message
sent to upstream router (R4)
R4
... 
R5
Interrmediate Node
(No Group Members)
Leaf Node
(No Group Members)
... 
R3
R6
Leaf Node
... 
Group | Group | Group |
Member | Member | Member |
229.225.0.1
Figure 9.6 Pruning leaf nodes from a multicast tree
Grafts to a Multicast Tree
A DVMRP router restores pruned branches to a multicast tree by sending graft messages towards the upstream router. Graft messages start at the leaf node and travel up the tree, first sending the message to its neighbor upstream router.
In the example above, if a new 229.255.0.1 group member joins on router R6, which had been pruned previously, a graft will be 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, it along with R6 will once again receive multicast packets.
You do not need to perform any configuration to maintain the multicast delivery tree. The prune and graft messages automatically maintain the tree.
9 - 41