Which Kind of Switch?

Hi there,

we have got a C300 with 3x BL460c with one CPU each and we need to upgrade the network to 10GB.

Now we have got a FlexFabric 10Gb 2-port 55AM Adapter (647590-B21) for each Server.
But the BladeSwitch doesn't work

At Bay 1 & 2 is a 10GB Ethernet Blade Switch (445860-B21).

Why doesn't work it? Wich Kind of Switch i should use?

Also we have got a BLc 1:10Gb Enet Switch (438031-B21)

Thank you.