I am having problems establishing an ether channel between a 6504 dist-sw and a 6509 acc-sw. The etherchannel at each end was configured as desirable silent, all other required settings match. I already have a number of etherchannels formed between the dist-sw and other acc-sw's configured the same. If I select different ports on the 24 port gig sfp ( ports 18 and 19)blade than the two Im having problems with(port 16 and 17)joining together the etherchannel comes up no problem. Its seems as though this is some type of a restriction as far as the number of ether channels you can have on one blade or which ports you select on the blade to etherchannel. I dont think its a faulty port problem as I have the same problem on the adjacnet distribution switch (Two distribution switches). Has anybody else run into this problem before?