If you're running ESX 3.5, there's a feature to backup your vSwitch configuration
using "vimsh" and as of 3.5u1 it turned into "vmware-vim-cmd". Easily
backing up that configuration pre-3.5 will have to be your standard
service console command "esxcfg-vswitch", I would say do the following:
esxcfg-vswitch -l (this will output your settings), long as your
systems are all the same, create a small bash script wrapper, to
re-create all your vswitches,portgroups, configure your vmkernel,
enable vmotion,etc,etc and add some logic based on the installation of
each host such as IP/Hostname. Once you've finished your deployment,
copy the shell script to each host and execute, and if done properly
you can have them all re-configured in a few minutes.
