Subject: BCP Documents on ISP Uses, Requirements, Desires for TE (TEBCPs)

From: "Ash, Gerald R (Jerry), ALABS" <[email-masked]>
Date: Thu, 31 Jul 2003 13:48:07 -0500

All,

Regarding the TEWG milestone 'BCP documents on ISP uses, requirements, desires (TEBCPs)', various drafts were submitted, including:

http://www.watersprings.org/links/mlr/id/draft-springer-te-level3bcp-00.txt (expired)
http://www.faqs.org/ftp/internet-drafts/draft-liljenstolpe-tewg-cwbcp-02.txt (expired)
http://www.watersprings.org/links/mlr/id/draft-ietf-tewg-qos-routing-04.txt (not accepted by IESG for publication)
 
To date, no BCPs have been published by the TEWG related to this work item.

However, the ITU-T has recently published the E.360 Series of 7 Recommendations on 'QoS Routing & Traffic Engineering Methods' (the full text and summaries are available at http://www.research.att.com/~jrex/jerry/ and a Liaison Statement to the IETF is posted at http://www.ietf.org/IESG/LIAISON/COM2-076.htm).  The Recommendations provide a basis for QoS routing and TE for IP-based multiservice networks, based on widely deployed best practices and network modeling/analysis.  As such, they are relevant to the request from the TEWG for service provider uses, requirements, and desires for traffic engineering best current practices.  

In the E.360 Series, analysis models are used to demonstrate that currently operational TE/QoS routing methods and best current practices are extensible to QoS routing and TE for IP/MPLS networks.  The methods addressed include call and connection routing, QoS resource management, routing table management, dynamic transport routing, capacity management, and operational requirements.  Based on the results of these studies as well as established practice and experience, methods for dynamic QoS routing and admission control are proposed for consideration in network migration to IP-based technologies. 

Also available at http://www.research.att.com/~jrex/jerry/ is a recently published Computer Communications paper based on this work, entitled "Performance evaluation of QoS-routing methods for IP-based multiservice networks'.  The paper provides a performance analysis of lost/delayed traffic and control load for various QoS routing methods, and shows that a) aggregated per-virtual-network bandwidth allocation compares favorably with per-flow allocation, and b) event-dependent routing methods for management of LSPs perform as well or better than state-dependent routing methods with flooding, and significantly enhance network scalability.

Thanks,
Jerry Ash