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Use of Overbooking in Diffserv-aware MPLS Traffic Engineering <draft-wlai-tewg-overbook-00.txt> IETF’57 TEWG Meeting Vienna, July 14, 2003 Jerry Ash, Wai Sum Lai AT&T Labs. Overbooking in DS-TE Per-domain per-CT overbooking Specified in current PROTO, MAM, and RDM drafts

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Use of Overbooking in Diffserv-aware MPLS Traffic Engineering

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Use of overbooking in diffserv aware mpls traffic engineering draft wlai tewg overbook 00 txt

Use of Overbooking in

Diffserv-aware MPLS Traffic Engineering

<draft-wlai-tewg-overbook-00.txt>

IETF’57 TEWG Meeting

Vienna, July 14, 2003

Jerry Ash, Wai Sum Lai

AT&T Labs


Use of overbooking in diffserv aware mpls traffic engineering draft wlai tewg overbook 00 txt

Overbooking in DS-TE

  • Per-domain per-CT overbooking

    • Specified in current PROTO, MAM, and RDM drafts

    • Based on existing techniques for aggregate TE:

      Link size overbooking

      LSP size overbooking

  • Per-link per-CT overbooking

    • Addressed by this draft

    • Two methods compared:

      Components-based approach (based on the LOM)

      Integrated approach


Use of overbooking in diffserv aware mpls traffic engineering draft wlai tewg overbook 00 txt

Components-Based Approach (the LOM Method)

New concepts

  • LOM = local overbooking multiplier

  • Normalized bandwidth = reserved bandwidth / LOM

    Bandwidth Constraints

  • Unaffected by LOM

    Unreserved Bandwidth

  • Needs to be adjusted to account for LOM

    Maximum Reservable Bandwidth

  • Relationship with LOM currently unspecified

    Impact on operations

  • Different formulas for different overbooking scenarios


Use of overbooking in diffserv aware mpls traffic engineering draft wlai tewg overbook 00 txt

Integrated Approach

Single concept, single formula

  • Maximum reservable bandwidth = maximum link bandwidth

  • OB = overbooking factor

  • OB = LSOM * LSPOM * LOM

    LSOM = link size overbooking multiplier

    LSPOM = LSP size overbooking multiplier

    LOM = local overbooking multiplier

    Impact on router operations

  • Reserved bandwidth = Tspec / OB


Use of overbooking in diffserv aware mpls traffic engineering draft wlai tewg overbook 00 txt

Integrated Approach

Issues under discussion

  • router interpretation of Tspec to determine ‘reserved bandwidth’

  • relationship to current overbooking models

    • validity of Maximum reservable bandwidth = maximum link bandwidth


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