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

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slide1

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

slide2

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

slide3

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
slide4

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
slide5

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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