When tow routers connected together,on R2 , "show mpls ldp neighbor" has one neighbor . but when three routers and connected to switch ,R1 have 2interwafce on SW and R1 ' interfaces have same range by R1 and R3 . R1,R2 = 10.0.0.0/8 R1,R3 = 20.0.0.0/8 mpls run on all routers and on R2 "show mpls ldp neighbor" has tow neighbor . why R3 is R3 ' neighbor ?