350-501 Architecture Practice Question
An SP has configured MPLS TE tunnels for traffic engineering. To verify the status of the TE tunnels, which command provides the most relevant information?
⚠ Common exam trap
Cisco often tests the distinction between LDP and RSVP-TE; candidates mistakenly think LDP is involved in TE tunnel signaling, but LDP is for label distribution in non-TE MPLS, while TE tunnels exclusively use RSVP-TE for path setup and bandwidth reservation.
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
✓
show mpls traffic-eng tunnels brief
The 'show mpls traffic-eng tunnels brief' command directly displays the status, state (up/down), and key parameters (e.g., bandwidth, path) of all configured MPLS TE tunnels, making it the most relevant command for verifying TE tunnel status. It provides a concise view of tunnel endpoints, admin/operational states, and signaled bandwidth, which is essential for traffic engineering verification.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
show mpls forwarding-table
Why it's wrong here
This displays label forwarding entries, not TE tunnel configuration or state.
- ✗
show mpls ldp tunnels
Why it's wrong here
This command shows LDP-related tunnel information, not TE tunnels.
- ✓
show mpls traffic-eng tunnels brief
Why this is correct
This command summarizes TE tunnel states and is the primary verification tool.
- ✗
show ip rsvp reservation
Why it's wrong here
RSVP reservations are used for TE but do not directly show tunnel status.
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