Allied Telesis AT-S39 - Manual (Page 88)

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Even though there is only one source, all the data links in the trunk are
used. For instance, if the server needed to send a packet to Workstation
C, by referring to the matrix Switch #2 would use Port 3 of the trunk to
transmit the packet from that particular source MAC address to Switch
#1.
As you can see, the SA/DA method is useful when a port trunk needs to
send packets from one source node to many destination nodes,
something that the SA method is not suited for. Additionally, the SA/DA
method is also valid when sending from many source nodes to one
destination node, or from many sources to many destinations.
The table below shows a possible matrix for a port trunk of three data
links using the SA/DA method, handling traffic from four sources to four
destinations.
The bottom line is that the SA/DA method is more flexible than the SA
method. A general rule to follow is if you are not sure which load
distribution to choose, you should probably go with SA/DA.
Table 3 Trunk Port Assignments in an SA/DA Matrix
Destinations Addresses
Source Addresses 00A0EE 2313A3 00A134 1A9032 00A301 9083B2 001B21 87C6D6
00B012 DA0231 1 2 3 1
001230 DA2943 2 3 1 2
0042AA D45A21 3 1 2 3
00456A C23521 1 2 3 1