http://datatracker.ietf.org/doc/search/?rfcs=on&activeDrafts=on&search_submit=&name=VLAN&sortBy=doc

http://datatracker.ietf.org/wg/trill/

http://baike.baidu.com/view/21837.htm?fromId=16125

http://www.bitscn.com/network/200605/26966.html

http://detail.zol.com.cn/product_param/index2786.html

http://hi.baidu.com/weioip/item/b9baf00c605ad726a1312d67

http://wenku.baidu.com/view/424c8a8fcc22bcd126ff0ca3.html