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300-415 · Question #331

Refer to the exhibit. A WAN Edge router is configured with SLAs. Which TLOC does the traffic take if the internet TLOC has latency 100 ms, loss 2%, jitter 50ms, and the MPLS TLOC has latency 50 ms…

The correct answer is A. MPLS. Given typical SLA configurations prioritizing lower latency and loss, traffic will choose the MPLS TLOC due to its superior latency and loss metrics.

Policies

Question

Refer to the exhibit. A WAN Edge router is configured with SLAs. Which TLOC does the traffic take if the internet TLOC has latency 100 ms, loss 2%, jitter 50ms, and the MPLS TLOC has latency 50 ms, loss 1%, and jitter 150 ms?

Options

  • AMPLS
  • Binternet
  • CMPLS or internet
  • Ddrop

How the community answered

(33 responses)
  • A
    85% (28)
  • B
    3% (1)
  • C
    3% (1)
  • D
    9% (3)

Why each option

Given typical SLA configurations prioritizing lower latency and loss, traffic will choose the MPLS TLOC due to its superior latency and loss metrics.

AMPLSCorrect

In SD-WAN, SLA policies prioritize links based on configured thresholds; given that MPLS has significantly lower latency (50ms vs 100ms) and lower loss (1% vs 2%), it is the preferred TLOC, even with higher jitter, unless jitter is explicitly set as the most critical parameter in the SLA and the threshold is violated.

Binternet

The internet TLOC has higher latency and higher loss, making it less desirable than MPLS under standard SLA configurations that typically prioritize these metrics.

CMPLS or internet

Without specific SLA thresholds and priorities, it's impossible for either to be chosen; however, given the metrics, one path is clearly superior in latency and loss.

Ddrop

Traffic would not be dropped unless both TLOCs failed to meet minimum SLA requirements or were otherwise unavailable.

Concept tested: Cisco SD-WAN SLA path selection

Source: https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/sdwan-xe-17-book/sdwan-policy-config.html

Topics

#SD-WAN SLA#Path selection#TLOC#Performance metrics

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