Implementing and Operating Cisco Service Provider Network Core Technologies (SPCOR) — Question 128

An engineer is implementing MPLS OAM to monitor traffic within the MPLS domain. Which action must the engineer perform to prevent packets from being forwarded beyond the service provider domain when the LSP is down?

Answer options

• A. Configure a private IP address as the destination address of the headend router of Cisco MPLS TE.
• B. Disable IP redirects only on outbound interfaces.
• C. Disable IP redirects on all ingress interfaces.
• D. Implement the destination address for the LSP echo request packet in the 127.x.y.z/8 network.

Correct answer: D

Explanation

The correct answer is D because using the 127.x.y.z/8 address ensures that echo request packets remain within the local host, preventing any possibility of them being forwarded outside the service provider domain. Options A, B, and C do not effectively address the issue of preventing packets from leaving the domain when the LSP fails.