Resources for Constrained Based Path Computation
Question
Which two resources are propagated by the headend router for constrained based path computation with MPLS Traffic Engineering? (Choose two.)
Answers
Explanations
Click on the arrows to vote for the correct answer
A. B. C. D. E. F.CD.
MPLS Traffic Engineering (MPLS-TE) enables network operators to establish traffic-engineered Label Switched Paths (LSPs) through a network. Constrained-based path computation (CBPC) is used to compute the paths for these LSPs. CBPC considers a set of constraints while computing the paths for LSPs.
The headend router is responsible for initiating the LSP and computing the path for the LSP. To compute the path, the headend router propagates certain resources, which are used by intermediate routers to compute the path for the LSP.
The resources that are propagated by the headend router for CBPC with MPLS-TE are:
Link bandwidth: The available bandwidth of the links between the routers is an essential resource that is propagated by the headend router. It enables the intermediate routers to select a path that has sufficient bandwidth to carry the traffic.
Link delay: The delay or latency of the links is another resource that is propagated by the headend router. The intermediate routers use this information to select a path that has the least delay.
Therefore, the correct answers to the given question are options C (link bandwidth) and E (link delay).
The other options listed, such as average link utilization, average input queue depth, link affinity, and link jitter, are not resources that are typically propagated by the headend router for CBPC with MPLS-TE. Although these metrics may be useful for network monitoring and troubleshooting, they are not typically used by the MPLS-TE protocol for path computation.
