Which protocol does MPLS use to support traffic engineering?
Which protocol does MPLS use to support traffic engineering?
MPLS (Multiprotocol Label Switching) uses the Resource Reservation Protocol (RSVP) to support traffic engineering. RSVP has been enhanced with traffic engineering extensions to reserve resources and establish Label Switched Paths (LSPs) that help efficiently manage and optimize network traffic.
Ref: How MPLS Traffic Engineering works - Cisco Community “… These components work together to make MPLS TE work: … • Path setup is a signaling protocol to reserve the resources for a traffic flow and to establish the LSP for a traffic flow. Resource Reservation Protocol (RSVP) is used for this purpose and has been enhanced with TE extensions for carrying labels and building the LSP. An alternative to RSVP for MPLS TE is constrained routing with Label Distribution Protocol (LDP), but Cisco devices do not support this protocol. …” A. TDP Wrong answer. B. RSVP Correct answer. C. LDP Wrong answer. D. BGP Wrong answer.
B is correct. MPLS traffic engineering automatically establishes and maintains LSPs across the backbone by using RSVP. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mp_te_path_setup/configuration/xe-16-11/mp-te-path-setup-xe-16-11-book/mpls-traffic-engineering-and-enhancements.html
B is correct
Answer B its correct