int eth 1/xg3 channel-group 1 mode on exit int port-channel 1 switrchport mode trunk switchport trunk allowed vlan add ..... exit When you configure port-channel (LAG, channel-group) interface all the configuration is done under the port-channel interface. On the physical interfaces you only specify to which port-channel they belong.
Hi I currently have 2 stacks of 8 6248 switches linked via a single 10G fibre connection. I am using the XG3/4 ports on the back of a couple of the 6248's. The link is currently trunking 6+  different VLAN's. What I would like to do is use the second 10G link that I have (currently not plugged in) as extra through put between the stacks  as well as redundancy if one of the fibre link fails. I have had a play with the LAG settings but I cant figure out how to get all the the trunks active across the aggrigated link. Anyone have any suggestions. Regards Paul      
Aggrigate Connection between 2 stacks of 6248's 