350-501 · Question #423
How is RSVP used with MPLS traffic engineering tunnels?
The correct answer is C. It reserves bandwidth along the path of the tunnel. RSVP (Resource Reservation Protocol) is used with MPLS Traffic Engineering (TE) tunnels to signal and reserve specific network resources, such as bandwidth, along the explicitly defined path of the tunnel.
Question
How is RSVP used with MPLS traffic engineering tunnels?
Options
- AIt assigns a tag to a packet as it travels through the tunnel.
- BIt removes and reassigns an MPLS label when the packet enters the tunnel.
- CIt reserves bandwidth along the path of the tunnel.
- DIt reduces the CPU burden when a packet travels through the tunnel.
How the community answered
(43 responses)- A2% (1)
- B2% (1)
- C91% (39)
- D5% (2)
Why each option
RSVP (Resource Reservation Protocol) is used with MPLS Traffic Engineering (TE) tunnels to signal and reserve specific network resources, such as bandwidth, along the explicitly defined path of the tunnel.
Assigning a tag (label) to a packet as it travels through the tunnel is a function of the MPLS data plane, not RSVP.
Removing and reassigning MPLS labels are label operations performed by MPLS Label Switching Routers (LSRs) as part of data plane forwarding, not a function of RSVP.
RSVP is the signaling protocol used in MPLS Traffic Engineering to establish TE tunnels by explicitly requesting and reserving specific network resources, such as bandwidth and explicit paths, along the chosen Label Switched Path (LSP) to meet traffic requirements.
While MPLS generally reduces CPU burden for packet forwarding compared to IP, RSVP-TE itself is a control plane protocol for signaling and resource reservation and does not directly reduce data plane CPU burden.
Concept tested: RSVP role in MPLS Traffic Engineering
Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mp_te/configuration/xe-16/mp-te-xe-16-book/mp-te-basics-xe.html
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