400-007 · Question #106
Which MPLS TE design consideration is true?
The correct answer is C. MPLS TE optimizes the routing of IP traffic, given the constraints imposed by backbone capacity. The core purpose of MPLS Traffic Engineering is to optimize IP traffic routing based on network constraints such as available bandwidth and link affinity, rather than relying solely on shortest-path IGP calculations.
Question
Which MPLS TE design consideration is true?
Options
- AMPLS TE replaces LDP and the dependency of the IGP to identify the best path.
- BMPLS TE provides link and node protection
- CMPLS TE optimizes the routing of IP traffic, given the constraints imposed by backbone capacity
- DMPLS TE requires Layer 3 VPN full-mesh topology deployment
How the community answered
(20 responses)- C95% (19)
- D5% (1)
Why each option
The core purpose of MPLS Traffic Engineering is to optimize IP traffic routing based on network constraints such as available bandwidth and link affinity, rather than relying solely on shortest-path IGP calculations.
MPLS TE uses RSVP-TE for tunnel signaling but does not replace LDP; LDP continues to operate independently for non-TE label distribution, and both protocols can coexist on the same network.
Link and node protection via Fast Reroute (FRR) is an optional MPLS TE extension, not a universal design characteristic; basic MPLS TE tunnels do not inherently provide FRR protection without explicit configuration.
MPLS TE uses RSVP-TE to signal Label Switched Paths (LSPs) along explicitly constrained paths determined by CSPF (Constrained Shortest Path First), allowing operators to route traffic based on bandwidth reservations, link affinity, and administrative constraints imposed by backbone capacity. This is the fundamental design purpose of MPLS TE - steering traffic away from congested shortest paths onto paths that better utilize available network resources.
MPLS TE is independent of L3VPN topology and does not require a full-mesh deployment; it can be used with any VPN topology including hub-and-spoke.
Concept tested: MPLS Traffic Engineering constraint-based path selection
Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mp_te/configuration/xe-16/mp-te-xe-16-book/overview-of-mpls-te.html
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