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350-501 · Question #365

Which function does RSVP perform in a Cisco MPLS TE environment?

The correct answer is D. It reserves the bandwidth along the path between the head-end and tail-end router. In a Cisco MPLS TE environment, RSVP-TE is responsible for establishing and maintaining label-switched paths by explicitly reserving bandwidth and other resources along the entire path from the head-end to the tail-end router.

MPLS and Segment Routing

Question

Which function does RSVP perform in a Cisco MPLS TE environment?

Options

  • AIt establishes targeted LDP sessions between neighbors that are directly connected.
  • BIt signals to LDP protocol along the path that a Cisco MPLS TE will be configured.
  • CIt reserves bandwidth for LDP sessions between routers participating in a Cisco MPLS TE.
  • DIt reserves the bandwidth along the path between the head-end and tail-end router.

How the community answered

(48 responses)
  • A
    4% (2)
  • B
    6% (3)
  • C
    2% (1)
  • D
    88% (42)

Why each option

In a Cisco MPLS TE environment, RSVP-TE is responsible for establishing and maintaining label-switched paths by explicitly reserving bandwidth and other resources along the entire path from the head-end to the tail-end router.

AIt establishes targeted LDP sessions between neighbors that are directly connected.

Targeted LDP sessions are established and managed by the LDP protocol itself, not by RSVP, and are used for label distribution to non-directly connected peers.

BIt signals to LDP protocol along the path that a Cisco MPLS TE will be configured.

RSVP and LDP are distinct label distribution protocols; RSVP does not signal or inform LDP about MPLS TE configurations, as they operate independently for different purposes.

CIt reserves bandwidth for LDP sessions between routers participating in a Cisco MPLS TE.

RSVP reserves bandwidth for the MPLS TE tunnel's traffic, not for 'LDP sessions'; LDP is generally used for best-effort label distribution and does not inherently reserve bandwidth.

DIt reserves the bandwidth along the path between the head-end and tail-end router.Correct

RSVP-TE (Resource Reservation Protocol-Traffic Engineering) is the signaling protocol used in MPLS TE to establish and maintain traffic-engineered LSPs. Its core function is to explicitly reserve bandwidth and other specified resources along the entire path that the LSP traverses, from the head-end router to the tail-end router, ensuring quality of service for the forwarded traffic.

Concept tested: RSVP-TE function in MPLS TE

Source: https://www.cisco.com/c/en/us/td/docs/ios/mpls/configuration/guide/mp_cfg_chap07.html

Topics

#RSVP-TE#MPLS Traffic Engineering#Bandwidth Reservation#Signaling Protocol

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