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352-001 · Question #705

352-001 Question #705: Real Exam Question with Answer & Explanation

The correct answer is D: next-next-hop tunnel. MPLS TE FRR uses next-next-hop (NNHOP) backup tunnels to protect against both link failures and node failures within the 50ms failover window required to match SONET/SDH resiliency. Next-hop tunnels alone only address link failures and cannot protect when the adjacent router itse

Question

A network engineering team is designing a lab network for a customer demonstration. The design engineer wants to show that the resiliency of the MPLS Traffic Engineering Fast Reroute solution has the same failover/failback times as a traditional SONET/SDH network (around 50 msec). Which type of MPLS TE tunnel must be considered for this demonstration to address the link failure and node failure within the lab network?

Options

  • Anext-hop tunnel
  • BTE backup tunnel
  • CFRR backup tunnel
  • Dnext-next-hop tunnel

Explanation

MPLS TE FRR uses next-next-hop (NNHOP) backup tunnels to protect against both link failures and node failures within the 50ms failover window required to match SONET/SDH resiliency. Next-hop tunnels alone only address link failures and cannot protect when the adjacent router itself fails.

Common mistakes.

  • A. A next-hop (NHOP) backup tunnel terminates at the next router and only protects against link failures between the PLR and that router, providing no protection if the next-hop node itself fails.
  • B. 'TE backup tunnel' is a generic descriptive term and not a specific MPLS TE FRR tunnel classification - the actual types are defined by where they terminate: next-hop (NHOP) or next-next-hop (NNHOP).
  • C. 'FRR backup tunnel' is not a recognized MPLS TE tunnel type designation - it is informal shorthand that does not specify whether link-only or node-plus-link protection is provided.

Concept tested. MPLS TE FRR next-next-hop tunnel node protection

Reference. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mp_te_path_protect/configuration/xe-16/mp-te-path-protect-xe-16-book/mp-te-frr-node-link-prot.html

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