350-501 Architecture Practice Question
In an SR network, which configuration is required to activate TI-LFA for link protection?
⚠ Common exam trap
Cisco often tests the distinction between per-interface and per-process configuration; the trap here is that candidates might think TI-LFA is configured under the interface (like traditional MPLS-TE FRR) rather than under the IGP process.
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
✓
fast-reroute per-prefix ti-lfa under the IGP process
TI-LFA (Topology Independent Loop-Free Alternate) is activated under the IGP process using the 'fast-reroute per-prefix ti-lfa' command. This enables segment routing to compute a backup path that provides link protection without relying on the topology of the failure, ensuring 50-msec convergence.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
metric delay interface configuration
Why it's wrong here
This affects IGP metric propagation, not fast reroute.
- ✗
label-preferred under the interface
Why it's wrong here
This is not a valid IOS-XE command.
- ✓
fast-reroute per-prefix ti-lfa under the IGP process
Why this is correct
This command enables TI-LFA for all prefixes in the IGP domain.
- ✗
mpls traffic-eng auto-tunnel primary
Why it's wrong here
This is for auto-generated TE tunnels, not for TI-LFA.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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