Hi PSYOPwarrior, The standard mtu size is 1500. Page 638 ftp://ftp.dell.com/Manuals/all-products/esuprt_ser_stor_net/esuprt_powerconnect/powerconnect-5548_Reference%20Guide_en-us.pdf   You can use the port jumbo-frame command to enable larger frames.   On the Force10 the default is 1554 [URL]
This is likely a noob question so forgive me, but I can't find the answer anywhere.  I am in the process of setting up vCloud Director and in a number of places it mentions:  "Physical infrastructure MTU must be at least 50 bytes more than the MTU of the virtual machine vNIC"  My problem is that I can't figure out what the MTU settings on these switches are currently and how I can change them to appropriately match what I need in the vShield environment? Hopefully this makes sense! Thanks!
Powerconnect 5500 / Force10 S4810 MTU settings