Our network is as follows: 2 6509, each with 2 SUP1A and 2 PFC/MSFC1.
Each rack (edge switches) has two 1000BaseSX backbones, one to each 6509 configured as trunks using DOT1Q.
At the moment our network is working without that redundancy between 6509 supervisors.
My question is as follows: is it tecnically correct to connect the two 6509 Sup1A to SUP1A using trunking (redundancy?).
In some documention, it is to my undestanding that it should not be done as to avoid spanning tree problems.