Foundry Networks Switch and Router User Manual

Configuring IP Multicast Protocols
December 2000 18 - 41
Figure 18.6 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.
Console
NetIron
Console
NetIron
Console
NetIron
Console
NetIron
Console
NetIron
Console
NetIron
Group
Member
Group
Member
Leaf Node
(No Group Members)
R5
R3
R4
R6
R1
R2
Leaf Node
Leaf Node
Video Conferencing
Server
(207.95.5.1, 229.225.0.1)
(Source, Group)
...
Group
Member
Group
Member
Group
Member
...
Group
Member
Group
Member
Group
Member
...
Prune Message
sent to upstream router (R4)
Interrmediate Node
(No Group Members)
229.225.0.1
229.225.0.1 229.225.0.1

Foundry Networks Switch and Router Specifications

General

Brand	Foundry Networks
Model	Switch and Router
Category	Switch
Language	English