300-410 Infrastructure Services Practice Question
A network engineer is configuring a Cisco IOS XE router to support MPLS Traffic Engineering (TE) with RSVP-TE. The engineer has enabled MPLS TE globally and on the interfaces. The engineer wants to ensure that the router can signal an LSP with a specific bandwidth requirement of 100 Mbps. Which command is required to enable RSVP-TE signaling on the interface?
⚠ Common exam trap
It's easy for candidates to confuse the global MPLS TE command with the interface-level RSVP-TE bandwidth command.
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
✓
ip rsvp bandwidth 100000
To enable RSVP-TE signaling on an interface, the 'ip rsvp bandwidth' command must be configured. This command reserves bandwidth for RSVP-TE LSPs and allows the interface to participate in RSVP signaling. The bandwidth value is specified in kilobits per second, so 100 Mbps is 100,000 kbps. Without this command, the router cannot signal an LSP with the required bandwidth, even if MPLS TE is enabled globally and on the interface.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
ip rsvp bandwidth 100000
Why this is correct
This command enables RSVP-TE signaling on the interface and reserves 100,000 kbps (100 Mbps) of bandwidth for RSVP-TE LSPs. It is required to signal an LSP with a specific bandwidth requirement. The bandwidth value is specified in kilobits per second, so 100 Mbps equals 100,000 kbps. This command allows the interface to participate in RSVP-TE signaling and reserve the requested bandwidth.
- ✗
mpls traffic-eng tunnels
Why it's wrong here
This command enables MPLS TE tunnels globally or on an interface, but it does not enable RSVP-TE signaling. It is necessary for the router to support TE tunnels, but RSVP-TE signaling requires the 'ip rsvp bandwidth' command to reserve bandwidth and signal LSPs. Without RSVP bandwidth configuration, the router cannot signal the LSP with the required bandwidth.
- ✗
mpls traffic-eng bandwidth 100000
Why it's wrong here
This command does not exist in Cisco IOS XE. The correct command to set the bandwidth for an MPLS TE tunnel is 'tunnel mpls traffic-eng bandwidth' under the tunnel interface, but that is for the tunnel itself, not for enabling RSVP-TE on a physical interface. To enable RSVP-TE on an interface, the 'ip rsvp bandwidth' command is used. This option is a distractor with incorrect syntax.
- ✗
mpls rsvp-te bandwidth 100000
Why it's wrong here
This command is not valid in Cisco IOS XE. The correct command to enable RSVP-TE and reserve bandwidth on an interface is 'ip rsvp bandwidth'. The 'mpls rsvp-te' syntax is not used in Cisco IOS XE for this purpose. This option is a distractor with incorrect syntax.
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Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Cisco exam blueprint
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