3Com 3C63100-AC-C - PathBuilder S600 Bridge/router Reference Manual page 173

Figure 134 Ad Virtual Circuit Screen—Selecting the Circuit Type
4 Enter the number corresponding to the type of circuit you want to configure:
Unicast—A bidirectional circuit.
MC Source—Multicast source; A multicast circuit is a circuit which its to be
multicast over other VCs (up to 32 leaves are supported). A multicast source
circuit indicates the source of the multicast.
MC Leaf—Multicast leaf; A multicast circuit is a circuit which its to be multicast
over other VCs (up to 32 leaves are supported). A multicast leaf circuit indicates
the replication destination.
You are prompted to specify the VC type of the circuit you are configuring, as
shown in Figure 135.
Figure 135 Add Virtual Circuit Screen—Selecting the VC Type
Configuring Virtual Circuits 173