I will try to explain my problem.
I want to increase bandwith to 2Gb/s on my network.
My network is really easy : 2 computer with 2 ports ethernet 1Gb/s configured in bonding (mode 0 round robin), so there is load-balancing and a better bandwidth.
Between the 2 computers, we have our cisco 4948 Catalyst. So i created port-channel 1 (port 3 and 4 for the 1st computer) and port-channel 2 (port 7 and 8 dor the 2nd computer) on mode 'ON' .
I read that mode 'ON' is enought to just increase bandwidth.
But it doesnt work, i tried other mode (desirable auto active passive), dont work too, i try to change the load-balancing : src-dst mac, ip, port, dont work. Always the same bandwidth : around 950 Mb/s
i did a test without the Switch : The computers are linked directly with 2 cross-cable, and the bandwidth is 1,8 Gb/s, Means bonding on Pc works.
PS : i'm french sorry.