Having an issue on a 3750 stack where we've enabled Jumbo frames for the gigabit interfaces and now I want to configure a WLC5508 to etherchannel to the 3750. I've gone through and created the Port-Channel interface but I when I add the member Gigabit interfaces, I get a log message that the MTU's are different between the Gi and Po interfaces. If I check the Gi interfaces I can see the MTU is set to 9000. The Po interface is set to 1500 MTU. I've not found a way of increasing this MTU on the Po interface. Any suggestions?
I have this problem too.