You could try recreating the whole thing, something like the following should do it (Need to be done from console which is where you are already I guess).
esxcfg-vswitch --unlink=vmnic0 vSwitch0
esxcfg-vswitch --delete vSwitch0
esxcfg-vswif --del vswif0
esxcfg-vswitch –a vSwitch0
esxcfg-vswitch -link=vmnic0 vSwitch0
esxcfg-vswitch –A “Service Console” vSwitch0
esxcfg-vswif –a vswif0 –i 10.1.1.1 –n 255.255.255.0 –p “Service Console”
Check out the following for information on the esxcfg net commands
http://www.b2v.co.uk/b2vguide2vmware3.htm
http://kb.vmware.com/kb/1000258