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Constraint-based LSP Setup using LDP

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Preemption. Failure Recovery. Recently, 'MPLS-OMP', C. Villamizar. 4. NANOG 15 ... Preemption, Route Pinning. TLVs for Error handling & diagnostics. 5. NANOG 15 ... – PowerPoint PPT presentation

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Title: Constraint-based LSP Setup using LDP


1
Constraint-based LSP Setup using LDP
  • Bilel Jamoussi
  • jamoussi_at_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
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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