Johnny Zhang
In vSphere the new vDS would make your life much easier. However, if anything goes wrong during configuration you lost all your network (That include your management network as well). If you still have iLO or KVM you can follow the steps to get the access back

Step 1: Logon to ESX host.

Step 2: Create a new temporary vSS (tmpSwitch) and Port Group (vswifPg)
esxcfg-vswitch -a tmpSwitch
esxcfg-vswitch -A vswifPg tmpSwitch

Step 3: Move uplink from vDS to vSS
esxcfg-vswitch -l (to get DVSwitch, DVPort, and vmnic names)
esxcfg-vswitch -Q vmnic0 -V (unlink vmnic0 from vDS)
esxcfg-vswitch -L vmnic0 tmpSwitch (link to vswitch)

Step 4: Move vswif from vDS to vSS
esxcfg-vswif -l (get vswif IP address, netmask, dvPort id, etc.)
esxcfg-vswif -d vswif0
esxcfg-vswif -a vswif0 -i -n -p vswifPg

Check or edit the default gateway address by editing /etc/sysconfig/network or adding default gateway address with:
route add default gw
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