draft-chen-opsawg-nettunnel-model-considerations-00.txt:Xia Chen:huawei:china:9:oct:2015:19:figure,kwd:Active:: draft-chen-opsawg-nettunnel-model-considerations-00.txt:Shunwan Zhuang:huawei:china:9:oct:2015:19:figure,kwd:Active::