单项选择题
A. establish starting at the egress router going back to the ingress router
B. establish starting at the ingress router going downstream to the egress router
C. establish when a router learns of a new prefix
D. establish when the path correctly matches the reverse path forwarding check
多项选择题 Which two statements are correct regarding MPLS LSP establishment methods?（） (Choose two.)
单项选择题 Which device is responsible for assigning label values in an MPLS network?（）
单项选择题 An ERX Edge Router is operating in an MPLS network using interface label space.What is used to make a forwarding decision?（）