I have 3 switch stacks of 3750G switches. Each stack has 3 switches for a total of 9 switches. The are connected using two fiber links from switch to switch. Config basically looks like a triangle with a stack at each point and the dual fiber links as the sides of the triangle.
If I would have configured this I would have bundled the two fibers of each leg using etherchannel teams. I would then rely on spanning tree turning off one the legs of the triangle to prevent loops.
However I did not config this, I inherited it. Instead of using etherchannel the architect of the setup configured the uplink ports with the command "spanning-tree link-type point-to-point".
How does this differ from etherchannel? it looks like I am not getting the benefit of the doubling of the throughput between switches.
Also, when I do a "show spanning-tree" I was surprised to find only one port of one of the legs in blocking mode. Should both ports be in block mode?