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A network engineer is configuring a newly installed PE router at the regional gateway location. The new PE router must use MPLS core routing protocols with the existing P router, and LDP sessions between the two routers must be protected to provide faster MPLS convergence. Which configuration must the engineer perform on the network so that LDP sessions are established?
Correct Answer: A
To establish LDP sessions between the PE and P routers, you need to enable communication over TCP port 646 for T-LDP hello messages. T-LDP (Targeted LDP) uses TCP port 646 for session establishment. Example configuration: interface GigabitEthernet0/0 mpls ldp discovery targeted-hello accept Reference: Implementing and Operating Cisco Service Provider Network Core Technologies (SPCOR) v1.0 course material.