You cannot choose the interfaces the way you explained. That is by design, due to internal failsafe network setup. On base ports all link aggregations should include eth2 port and in case of IO module it must include eth10.
I'm with a customer and configuring link aggregation on a VNXe3300.  we wants to combine eth2 on one card with eth10 on another but we are prevented from doing this in GUI and command line.  Is there a technical reason for this?  Also we would like to combine eth4 and eth5 or any other combination of ports but it seems you can only create link aggreagation ports when combined with eth2 or with eth10.  Smarti
Why can't we configure eth2 and eth10 for link aggregation?