Multicast Distribution Trees
 Source or Shortest Path trees
More resource intensive; requires more state n(S x G)
You get optimal paths from source to all receivers, minimizes delay
Best for one-to-many distribution
 Shared or Core Based trees
Uses less resources; less  memory n(G)
You may get sub optimal paths from source to all receivers,
depending on topology
The RP (core) itself and its location may affect performance
Best for many-to-many distribution
May be necessary for source discovery (PIM-SM)