Source tree forwarding

Source tree forwarding
Corporate
intranet
Host A Host B
Host D Host C
Router 1 Router 3
Router 2 Router 4
Switch 1
Switch 2
Switch 3
Switch 4
Source 172.16.1.51
for group 225.3.1.100
Member 224.2.127.254 Member 225.3.1.100
Also notice in this figure that the shortest path to the receivers was chosen. This is known as
choosing the shortest path tree (SPT). You can see from the preceding output that there are three
sources for the same group of 224.2.127.254. This indicates that there are three SPT groups shown
here: (195.134.100.102, 224.2.127.254), (207.98.103.221, 224.2.127.254), and (128.39.2.23,
224.2.127.254). Each of these sources has its own shortest path tree to the receivers.