i have 4 switches, they have 4 ports fa21, fa22 are port channel one and fa23,fa24 are port channel 2. Everything is fine until i set the trunk native vlan to anything other than vlan 1. When is set the native to say 150 i get mismatch errors like crazy. i can get rid of the errors by selecting the allowed vlans 2-1000. However, this should not have to be the case.
Second, the native VLAN has to be the same across all the intefaces that make up the channel.