Hi, Probably at least three, one for each of the MXLs and one for the CMC. You may also want IPs for each of the iDRACs on the blades, so that you can access them directly.
 I am working to implement the M1000e chassis which will utilize 2 Dell Force10 MXL integrated switch blades. between the intergrated swtches and other management functions, how many IP addresses do I need to allocate to the Chassis? 
M1000e IP Address requirements?