Hello, I build a new network loop. 1st : I have 2 switchs linked with stack (9300), and 8 GBIC per switch.2nd : I have many other switchs with 2 GBIC per switch. I create a fiber network : -----9300_Nb1 (gbic_3) >>gbic_25 : 2960-X : gbic_27 >>gbic...