What types of protection switching does enhanced MSTP support? (Multiple Choice)

Question

Options

• ASNCP
• BMSP
• CLSP1+1/1:1
• DMPLS-TP ring network protection

• A
  100% (31)

Explanation

Enhanced MSTP (Multi-Service Transport Platform) is designed as a converged, multi-layer transport system that unifies both traditional SDH/TDM and modern packet/MPLS transport - precisely why it supports all four protection mechanisms listed. In this question, there are no wrong distractors; every option is correct.

• SNCP (A) - Sub-Network Connection Protection is a classic SDH/SONET path-level protection where traffic is duplicated across two routes and the receiver selects the better signal; enhanced MSTP inherits full SDH capabilities.
• MSP (B) - Multiplex Section Protection operates at the SDH section level (1+1 or 1:N), protecting point-to-point links; again, inherited from SDH support.
• LSP 1+1/1:1 (C) - Label Switched Path protection covers the MPLS/packet layer; 1+1 sends traffic on both paths simultaneously while 1:1 switches only on failure - supported because enhanced MSTP carries MPLS traffic.
• MPLS-TP Ring Protection (D) - Adds ring-topology protection for MPLS-TP networks, relevant to metro/carrier Ethernet deployments within the platform.

Memory tip: Think "Enhanced = Everything." Because enhanced MSTP bridges the gap between legacy SDH and modern MPLS-TP, it must support all protection layers - SDH-level (SNCP, MSP) and packet-level (LSP, MPLS-TP ring). If a question lists all four, the answer is almost certainly all four.

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