InthecontextofMPLS,whatisthecorrectactiontobeperformedwhenanaggregatelabelisrece
A.ItaddstheVPNlabelintothetoplabelintheMPLSlabelstack
B.ItreplacesthetoplabelintheMPLSlabelstackwithaVPNlabelandpropagates
C.ItreplacesthebottomlabelintheMPLSlabelstackwithaVPNlabelandpropagates
D.ItremovesthetoplabelintheMPLSlabelstackanddoesaLayer3lookuponunderlyingIPpackets
E.Noneofabove
正确答案：参考D
词条内容仅供参考，如果您需要解决具体问题
（尤其在法律、医学等领域），建议您咨询相关领域专业人士。