Well, I'm a bit sceptical when deploy anything in Server Core at the first place.
As an additional tool from previous post:- http://www.ms4u.info/2009/12/managing-server-core-easy-or-hard-way.html
If you would like to do teaming on DELL Server, please refer to http://www.ms4u.info/2010/02/install-broadcom-advanced-control-suite.html
How about HP NIC Teaming?
1. Go to hp website and navigate to hardware driver.
2. Locate HP NCU (Network Configuration Utility) , download and install into Server Core
3. Then simply start hpteam.cpl from c:\program files\hp\ncu and do the usual GUI based configuration.
Is that simple? Never guess that NCU is working in Server Core.