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Constraint-based LSP Setup using LDP

Constraint-based LSP Setup using LDP. Bilel Jamoussi jamoussi@nortelnetworks.com. Agenda. Overview: MPLS Values Traffic Engineering Requirements Constraint-based LSP setup using LDP CRLSP Setup Progress in IETF: Consensus Progress in IETF: Running Code Issues with RSVP Extensions

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Constraint-based LSP Setup using LDP

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  1. Constraint-based LSP Setup using LDP Bilel Jamoussi jamoussi@nortelnetworks.com

  2. Agenda • Overview: MPLS Values • Traffic Engineering Requirements • Constraint-based LSP setup using LDP • CRLSP Setup • Progress in IETF: Consensus • Progress in IETF: Running Code • Issues with RSVP Extensions • Questions to ISPs

  3. Overview: MPLS Values • Traffic Engineering • IP-VPN • L2/L3 Integration

  4. Traffic Engineering • “Requirements for Traffic Engineering Over MPLS”,D. Awduche, et al: • Strict & Loose ER • Specification of QoS • Specification of Traffic Parameters • Route Pinning • Preemption • Failure Recovery • Recently, “MPLS-OMP”, C. Villamizar

  5. Constraint-based LSP Setup using LDP • Uses LDP Messages & TLVs • LDP runs on a reliable transport(TCP) • Does NOT require hop-by-hop • Introduces new TLVs to signal ER, and other “Constraints” • QoS, • Traffic Parameters, • Preemption, • Route Pinning • TLVs for Error handling & diagnostics

  6. 1. Label Request 2. Label Mapping CRLSP Setup IN LER 1 LSR 2 LSR 3 LSR Out LER Notification Release / Withdraw Downstream on demand ordered label distribution mode

  7. Current CRLDP QoS Support • Three Service Class • Best Effort • Throughput Sensitive • Delay Sensitive • Traffic Parameters • Peak Data Rate • Committed Data Rate • Committed Burst Tolerance

  8. Progress in IETF: Consensus Constraint-Based LSP Setup using LDP • 14 vendors & ISPs collaborated on CRLDP • Accepted through MPLS WG Consensus • CRLDP is included by reference in the base LDP Specification • LDP Spec is going thorough last call this month

  9. Progress in IETF: Running Code Constraint-Based LSP Setup using LDP • Demonstrated interoperability among 3 Vendors’ implementations in November ‘98 • CRLDP is simple, stable, robust, and easily extendible • Implementations are being tested

  10. Issues with RSVP Extensions for MPLS • Soft state refresh overhead is problematic for MPLS scalability • Latency & reliability: problematic for robustness • Fundamental changes to the RSVP protocol are proposed • RSVP WG expressed resistance to extensions in Orlando IETF • Discussion has not yet started on RSVP mailing list

  11. Questions to ISPs • Is MPLS viewed as mainly an “Intra-Provider” solution in the short-term? • If so, is QoS is a requirement? • Is MPLS a viable “Inter-Provider” solution? • Will ISPs offer MPLS as a service? • Is Loose Explicit Routing a requirement?

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