Is it possible to deploy a Bright Cluster using 10 Gig-E switches instead of 1 Gigabit switches?
Yes.
But make sure that your 10 Gig-E NICs can PXE boot. Nowadays this is not a problem, but in the past there have been some buggy PXE implementations in 10 Gig-E NICs which would require upgrading the firmware of the NIC. You don’t want to have to manually do that on, for example, 1000 nodes.