Which utility can you use to validate an LSP in an MPLS environment?

The correct answer is B. MPLS LSP ping. MPLS LSP ping is specifically designed to test the end-to-end connectivity of a Label Switched Path (LSP) in an MPLS network. It works similarly to a regular ICMP ping but operates within the MPLS data plane, sending echo requests along the LSP to verify that the path is…

Transport Technologies

Question

Options

AuRPF
BMPLS LSP ping
Clogging
DRSVP

How the community answered

(49 responses)

A
4% (2)
B
86% (42)
C
2% (1)
D
8% (4)

Explanation

MPLS LSP ping is specifically designed to test the end-to-end connectivity of a Label Switched Path (LSP) in an MPLS network. It works similarly to a regular ICMP ping but operates within the MPLS data plane, sending echo requests along the LSP to verify that the path is correctly established and forwarding packets as expected.

Why the distractors are wrong:

A. uRPF (Unicast Reverse Path Forwarding) is an anti-spoofing mechanism that validates source IP addresses on incoming packets - unrelated to LSP validation.
C. Logging captures events and errors for monitoring/troubleshooting but cannot actively probe or validate an LSP.
D. RSVP is a signaling protocol used to establish and reserve resources for LSPs (particularly in Traffic Engineering), not to validate them after the fact.

Memory tip: Think "ping = test connectivity" - just as you ping an IP address to test reachability, MPLS LSP ping does the same thing inside the MPLS tunnel. The word "ping" in the answer is your clue.

Topics

#MPLS LSP ping#LSP validation#MPLS verification#Path validation

Community Discussion

No community discussion yet for this question.

Full 300-515 Practice