多项选择题

A.EBGP multihop is not configured on routers R1 and R3
B.Routers R1 and R3 do not receive the same routes via an IGP
C.Synchronization in autonomous system 100 is turned is on
D.The BGP routers in autonomous system 100 are not logically fully-meshed
E.Synchronization in autonomous system 100 is turned is off