Bandwidth Constraints Models for Differentiated Services (Diffserv)-aware MPLS Traffic Engineering: Performance Evaluation
RFC 4128
|
| Document |
Type |
|
RFC - Informational
(June 2005; No errata)
|
|
Last updated |
|
2015-10-14
|
|
Stream |
|
ISE
|
|
Formats |
|
plain text
pdf
html
bibtex
|
| Stream |
ISE state
|
|
(None)
|
|
Consensus Boilerplate |
|
Unknown
|
|
Document shepherd |
|
No shepherd assigned
|
| IESG |
IESG state |
|
RFC 4128 (Informational)
|
|
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
Show full document text