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Enable Jumbo Frames on ESXi 4.1

I've been using ESX but I just purchased a new ESXi server and I want to enable jumbo frames.  I can't change this setting using the same method as before.  The only answers that I find online suggest that I SSH into the ESXi host and use the esxcfg -vswitch commands.  ESXi says that the esxcfg command is not recognized.  What am I missing here?  
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Andrew Hancock (VMware vExpert PRO / EE Fellow/British Beekeeper)
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That worked.  I must have put a space after esxcfg and -vswitch.  Thanks for the help.  
and make sure with esxcfg-nics -l the NICs have a MTU of 9000.

the above output is from an ESXi 4.1 host

are you specifiy a dash, between esxcfg-vswitch?