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3<br />
PIM Dense<br />
FIGURE 4<br />
Pruning leaf nodes from a multicast tree<br />
229.225.0.1<br />
Group<br />
Member<br />
Group<br />
Member<br />
Video Conferencing<br />
Server<br />
(207.95.5.1, 229.225.0.1)<br />
(Source, Group)<br />
229.225.0.1<br />
Group Group<br />
Member Member<br />
...<br />
Group<br />
Member<br />
R2<br />
R1<br />
R3<br />
R4<br />
Prune Message<br />
sent to upstream router (R4)<br />
R5<br />
R6<br />
Leaf Node<br />
(No Group Members)<br />
... ...<br />
Intermediate Node<br />
(No Group Members)<br />
Group Group<br />
Member Member<br />
229.225.0.1<br />
Group<br />
Member<br />
Grafts to a multicast tree<br />
A PIM device restores pruned branches to a multicast tree by sending graft messages towards the<br />
upstream device. Graft messages start at the leaf node and travel up the tree, first sending the<br />
message to its neighbor upstream device.<br />
In the example above, if a new 229.255.0.1 group member joins on device R6, which was<br />
previously pruned, a graft is sent upstream to R4. Since the forwarding state for this entry is in a<br />
prune state, R4 sends a graft to R1. Once R4 has joined the tree, R4 along with R6 once again<br />
receive multicast packets.<br />
Prune and graft messages are continuously used to maintain the multicast delivery tree. No<br />
configuration is required on your part.<br />
PIM DM versions<br />
The <strong>Brocade</strong> device supports only PIM V2. PIM DM V2 sends messages to the multicast address<br />
224.0.0.13 (ALL-PIM-ROUTERS) with protocol number 103.<br />
Configuring PIM DM<br />
NOTE<br />
This section describes how to configure the “dense” mode of PIM, described in RFC 1075. Refer to<br />
“Configuring PIM Sparse” on page 86 for information about configuring PIM Sparse.<br />
74 FastIron Ethernet Switch IP Multicast Configuration Guide<br />
53-1002638-02