problem with Broadcom BCM57416 NetXtreme-E dual port 10GBASE-T

we recently buy a Dell R640 server with ESXi

and one Broadcom NetXtreme BCM5720 dual port Gigabit Ethernet

and one Broadcom BCM57416 NetXtreme-E dual port 10GBASE-T

i create a Vswitch0 with the two gigabit ethernet card for management

i create a Vswitch1 with the two 10GBASE-T card for all virtuals machines (actually just one vm)

firmware ok, driver ok, ESXi version ok, linkspeed auto-negotiation enable

everything seems to be ok but i can't ping my only virtual machine

thx for your ideas