Bandwidth Constraints Models for Differentiated Services (Diffserv)-aware MPLS Traffic Engineering: Performance Evaluation
RFC 4128
Document | Type |
RFC - Informational
(June 2005; No errata)
Was draft-wlai-tewg-bcmodel (gen)
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Author | Wai Lai | ||
Last updated | 2015-10-14 | ||
Stream | Independent Submission | ||
Formats | plain text html pdf htmlized (tools) htmlized bibtex | ||
Stream | ISE state | (None) | |
Consensus Boilerplate | Unknown | ||
Document shepherd | No shepherd assigned | ||
IESG | IESG state | RFC 4128 (Informational) | |
Action Holders |
(None)
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Telechat date | |||
Responsible AD | Bert Wijnen | ||
Send notices to | rfc-editor@rfc-editor.org |
Network Working Group W. Lai Request for Comments: 4128 AT&T Labs Category: Informational June 2005 Bandwidth Constraints Models for Differentiated Services (Diffserv)-aware MPLS Traffic Engineering: Performance Evaluation Status of This Memo This memo provides information for the Internet community. It does not specify an Internet standard of any kind. Distribution of this memo is unlimited. Copyright Notice Copyright (C) The Internet Society (2005). IESG Note The content of this RFC has been considered by the IETF (specifically in the TE-WG working group, which has no problem with publication as an Informational RFC), and therefore it may resemble a current IETF work in progress or a published IETF work. However, this document is an individual submission and not a candidate for any level of Internet Standard. The IETF disclaims any knowledge of the fitness of this RFC for any purpose, and in particular notes that it has not had complete IETF review for such things as security, congestion control or inappropriate interaction with deployed protocols. The RFC Editor has chosen to publish this document at its discretion. Readers of this RFC should exercise caution in evaluating its value for implementation and deployment. See RFC 3932 for more information. Abstract "Differentiated Services (Diffserv)-aware MPLS Traffic Engineering Requirements", RFC 3564, specifies the requirements and selection criteria for Bandwidth Constraints Models. Two such models, the Maximum Allocation and the Russian Dolls, are described therein. This document complements RFC 3564 by presenting the results of a performance evaluation of these two models under various operational conditions: normal load, overload, preemption fully or partially enabled, pure blocking, or complete sharing. Lai Standards Track [Page 1] RFC 4128 BC Models for Diffserv-aware MPLS TE June 2005 Table of Contents 1. Introduction ....................................................3 1.1. Conventions used in this document ..........................4 2. Bandwidth Constraints Models ....................................4 3. Performance Model ...............................................5 3.1. LSP Blocking and Preemption ................................6 3.2. Example Link Traffic Model .................................8 3.3. Performance under Normal Load ..............................9 4. Performance under Overload .....................................10 4.1. Bandwidth Sharing versus Isolation ........................10 4.2. Improving Class 2 Performance at the Expense of Class 3 ...12 4.3. Comparing Bandwidth Constraints of Different Models .......13 5. Performance under Partial Preemption ...........................15 5.1. Russian Dolls Model .......................................16 5.2. Maximum Allocation Model ..................................16 6. Performance under Pure Blocking ................................17 6.1. Russian Dolls Model .......................................17 6.2. Maximum Allocation Model ..................................18 7. Performance under Complete Sharing .............................19 8. Implications on Performance Criteria ...........................20 9. Conclusions ....................................................21 10. Security Considerations .......................................22 11. Acknowledgements ..............................................22 12. References ....................................................22 12.1. Normative References ....................................22 12.2. Informative References ..................................22 Lai Standards Track [Page 2] RFC 4128 BC Models for Diffserv-aware MPLS TE June 2005 1. Introduction Differentiated Services (Diffserv)-aware MPLS Traffic Engineering (DS-TE) mechanisms operate on the basis of different Diffserv classes of traffic to improve network performance. Requirements for DS-TE and the associated protocol extensions are specified in references [1] and [2] respectively. To achieve per-class traffic engineering, rather than on an aggregate basis across all classes, DS-TE enforces different Bandwidth Constraints (BCs) on different classes. Reference [1] specifies the requirements and selection criteria for Bandwidth Constraints Models (BCMs) for the purpose of allocating bandwidth to individual classes. This document presents a performance analysis for the two BCMs described in [1]: (1) Maximum Allocation Model (MAM) - the maximum allowable bandwidthShow full document text