A Service Provider Network Is Comprised of Several PE Routers

Multiple Choice

A service provider network is comprised of several PE routers that run iBGP with a pair of route reflectors for all BGP address families. Which two characteristics of the Constrained Route Distribution for BGP/MPLS VPNs scenario are true? (Choose two.)

A) The RR must advertise the default route target filter toward the PE routers
B) PE and RR routers must support this feature
C) Route distinguishers are used to constrain routing updates
D) The RRs do not need to advertise any route target filter toward the PE routers
E) This feature must be enabled on all devices in the network at the same time