NM-16ESW supports Etherchannel only (http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122newft/122limit/122x/122xt/122xt_2/ft1636nm.htm#xtocid5), you can go to the following URL to find some information:
http://www.cisco.com/warp/customer/473/4.html
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