Implementing and Operating Cisco Service Provider Network Core Technologies (SPCOR) — Question 250

A new PE router is configured to run OSPF as an IGP with LDP on all interfaces. The engineer is trying to prevent black holes after convergence when the
PERSON device loses an LDP session with other PE routers. Which action must the engineer take to implement LDP session protection on a new PE router?

Answer options

• A. Configure the mpls ldp session protection and mpls label protocol ldp commands on the interfaces on the new PE router that connect to the CENTER routers.
• B. Configure the mpls ldp discovery targeted-hello accept and mpls ldp session protection commands on the interfaces on the new PE router that connect to the CE routers.
• C. Configure the new PE router with the mpls ldp session protection command and on neighboring routers that connect to this new PE router.
• D. Configure the new PE router with the mpls ldp session protection command on interfaces with directly connected neighbors.

Correct answer: C

Explanation

The correct answer, C, is appropriate because implementing the mpls ldp session protection command on both the new PE router and its neighboring routers ensures that LDP sessions are safeguarded against disruptions. Options A and B focus on specific commands for different router connections, which do not fully address the requirement for session protection. Option D limits the protection to directly connected neighbors, which is insufficient for comprehensive session safeguarding.