2960S is formed a port-channel with 2960. When 2960S physical Interfaces are configured with 100 full, outdiscards packets issue are found at 2960S egree queue. I checked the traffic flow via the port-channel under 100 MB, and it only found at 2960S, 2960 does not have this issue. I have updated both switch to 12.2(58). Does anyone know what is happening?
PS: 2960 do not support 1G full.
I had done any test by using 2 2960S to form a port-channel. If I configure both switch to 100 full, outdiscards packet issue found. When I changed both physcial Interface to 1G full, problem solved.
Does it mean 2960S physical interface only allow 1G traffic even I set it to 100?