Unsupported Trunks; Figure 29: Unsupported Trunk With Different Numbers Of Links Between Switches; Figure 30: Unsupported Trunk With Mixed Cables - Allied Telesis AlliedWare Plus x950 Series Installation Manual

Unsupported
The following are examples of unsupported trunks.
Trunks
Figure 29. Unsupported Trunk with Different Numbers of Links Between
Wiring Room 1
AT-SP10TW Direct
Attach Cables
Fiber Optic Cables
Wiring Room 2
 In stacks of three or four switches, the number of links in the trunk
has to be the same on all switches. The trunk in Figure 29 is
unsupported because the middle switch is connected to the top
and bottom switches with two links each, while the top and bottom
switches are connected with only one link.
 The cables in a trunk must be all the same type: They can be all
fiber optic cables, direct attach cables, or twisted pair cables.
Trunks cannot contain different types of cables. The trunk in
Figure 30 is unsupported because it has both fiber optic and direct
attach cables.
Figure 30. Unsupported Trunk with Mixed Cables
x950 Series Installation Guide for VCStack
Switches
65