Figure 40: Unsupported Trunk With Only One Link Between Switches; Figure 41: Unsupported Trunk With Different Port Speeds - Allied Telesis x950 Series Installation Manual

Chapter 3: Virtual Chassis Stacking
86
In most cases, trunks should have a minimum of two links between

switches. The trunk in Figure 40 is not recommended because
there is only one link between switches. The exceptions to this are
stacks of three or four switches with trunks of base 100Gbps ports.
Refer to Figure 32 on page 81.
Figure 40. Unsupported Trunk with Only One Link Between Switches
Trunk links must be the same speed. The example in Figure 41 is

unsupported because the links are different speeds.
Figure 41. Unsupported Trunk with Different Port Speeds
Allied Telesis does not recommend using the XEM2-1CQ Line

Card for a stack trunk because it has only one transceiver port and
the switch has only one expansion port. Refer to Figure 42 on page
87. Instead, use two base 40/100Gbps transceiver ports, as shown
in Figure 32 on page 81, to build a 100Gbps trunk.
10Gbps
40Gbps or
100Gbps