Old and new nexus cards dont like each other

It seems that when you have a mix of N7K-M132XP-12 and N7K-M132XP-12L you have to do an force command in order to have a port on the 12L join and etherchannel with older 12 cards. You have to preconfig all the vlans (generally make the new interface look like the port channel) to get the thing to work. Clunky