Ok great - go to this document
http://now.netapp.com/NOW/knowledge/docs/hardware/filer/210-00640+H0.pdf
and you will want to cable exactly as you see in the "Cabling for a Standard Active/Active Configuration" diagram so that each controller will have an "IN" connection to both shelves. This is so that in the event of a failover there is an alternate second Fibre Channel path to the shelf.
In general FC is very forgiving of hot plugging new paths but I have to put the disclaimer here that in your case since you have two different shelf types (one of which I think is now EOL) you should log a case with NGS to make sure there are no known problems in this scenario with your version of ONTAP and firmware levels.
Cheers