Nokia MultiProtocol Label Switching
Question No. 1
RSVP LSPs must exist between each PE-ABR pair, or ABR-ABR pair in each area.
When LDP-over-RSVP is active, the LDP prefixes are resolved to a physical egress interface.
Targeted sessions must exist between all routers along the tunnel path.
Link LDP sessions must exist between each ABR-ABR pair in each area.