350-501 MPLS and Segment Routing Practice Question
A service provider wants to use Segment Routing TE with Flex-Algo to engineer traffic around links with low bandwidth. Which configuration approach should be taken?
⚠ Common exam trap
Cisco often tests the distinction between standard IGP metric manipulation and Flex-Algo's custom metric types, where candidates mistakenly think adjusting the IS-IS metric is the correct Flex-Algo approach, but Flex-Algo requires explicit definition of a new metric type rather than relying on the default metric.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Define a Flex-Algo with a metric type of 'min-unidirectional-link-bandwidth'.
Flex-Algo allows the definition of a custom metric type, such as 'min-unidirectional-link-bandwidth', which enables Segment Routing TE to compute paths that avoid low-bandwidth links. This approach directly addresses the requirement to engineer traffic around links with low bandwidth by using bandwidth as the path selection metric.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Configure a policy-map to apply QoS marking on TE tunnels.
Why it's wrong here
QoS policy does not affect path computation for TE tunnels.
- ✗
Use the 'min-delay' metric in Flex-Algo to prefer low-delay links.
Why it's wrong here
Min-delay selects low-delay links, not based on bandwidth.
- ✓
Define a Flex-Algo with a metric type of 'min-unidirectional-link-bandwidth'.
Why this is correct
This Flex-Algo metric excludes links with insufficient bandwidth, meeting the requirement.
- ✗
Use standard IS-IS metric and adjust it on low-bandwidth links to a high value.
Why it's wrong here
Manual metric adjustment is possible but not a Flex-Algo feature; Flex-Algo provides automatic exclusion based on bandwidth.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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