Alcatel Carrier Internetworking Solutions 8800 User Manual
Troubleshooting PIM-SM
Shared Tree
OmniSwitch Troubleshooting Guide
September 2005
page 16-23
Shared Tree
A shared distribution tree is formed around the RP, from which all traffic is distributed regardless of the
location of the traffic sources. The advantage of shared distribution trees is simple topology on PIM SM
routers. The DR is sending a JOIN message to the RP, and a graft to the SPT. The disadvantage is that the
path between the source and receivers might not be the shortest one, which could introduce delay. The
rendezvous router may also be a traffic bottleneck if there are many high data rate sources. The Source
Path Tree can be called RP TREE too.
location of the traffic sources. The advantage of shared distribution trees is simple topology on PIM SM
routers. The DR is sending a JOIN message to the RP, and a graft to the SPT. The disadvantage is that the
path between the source and receivers might not be the shortest one, which could introduce delay. The
rendezvous router may also be a traffic bottleneck if there are many high data rate sources. The Source
Path Tree can be called RP TREE too.
MCAST SOURCE
225.1.1.1
MCAST RECEIVER
for 225.1.1.1
MCAST SOURCE
225.1.1.1