352-001 Question #482: Real Exam Question with Answer & Explanation

The correct answer is A: OAM for MPLS Networks. VPLS is transported over MPLS LSPs, so OAM for MPLS Networks is the correct standard to monitor the underlying transport paths that carry customer VPLS traffic and support SLA verification.

Question

You are reviewing the Layer 2 VPN service offering of a service provider. A top priority is meeting SLAs for its customers. Which OAM standard should you recommend to monitor customer VPLS connectivity?

Options

AOAM for MPLS Networks
BConnectivity Fault Management
CEthernet in the First Mile
DEthernet Local Management Interface

Explanation

VPLS is transported over MPLS LSPs, so OAM for MPLS Networks is the correct standard to monitor the underlying transport paths that carry customer VPLS traffic and support SLA verification.

Common mistakes.

B. Connectivity Fault Management (IEEE 802.1ag) is an Ethernet-layer OAM standard for monitoring Ethernet segments, not the MPLS transport paths that carry VPLS pseudowires between PEs.
C. Ethernet in the First Mile (IEEE 802.3ah) is scoped to point-to-point Ethernet access links only and provides no mechanism for monitoring multi-point VPLS connectivity across an MPLS core.
D. E-LMI (MEF 16) is a protocol for signaling service attributes between CE and PE devices and does not perform active connectivity monitoring or provide path-level fault detection.

Concept tested. OAM for MPLS-based VPLS connectivity monitoring

Reference. https://www.rfc-editor.org/rfc/rfc4379

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