Workshop on

Internet Design for SLS Delivery

"From Service Level Specification to Per Hop Behaviour"

25 - 26 January 2001
Tulip Inn Tropen, Amsterdam, The Netherlands
The IST-TEQUILA project organised a workshop on Quality of Service in IP networks and Internet Design for SLS delivery. This workshop was held in Amsterdam on 25-26 January 2001. 

Presentations, Pictures and Attendees

The presentations are now available on the Web through the workshop program web page. A list of the workshop attendees is also available here.Take a look at the workshop pictures page, by Michael Smirnov (GMD-FOKUS / CADENUS Project). Some  more pictures by David Griffin (UCL / TEQUILA).


The workshop focuses on two (related) topics: 

  • Service Level Specifications (SLS) - Modelling and Monitoring Customer Demands
  • Traffic Engineering (TE) and Management - Meeting the Customer Demands
SLS and TE are key aspects for the deployment of value-added IP service offerings over the Internet. Since these IP services are likely to be provided over the whole Internet, their corresponding QoS will be based upon a set of technical parameters that both customers and services providers will have to agree upon. Such agreements, and especially the negotiations preceding them, will be greatly simplified in the presence of an unambiguous set of (technical) SLS parameters. After signing the agreements and specifying the SLSs, it is further the task of the service provider to meet the customer demands through network management and traffic engineering. The customer expects certain performance from the network, but the operator also attempts to satisfy these expectations in a cost-effective manner. Therefore traffic engineering is a basic tool for the operator to accommodate as many as possible of the traffic requests by using optimally the available network resources.

Background on the TEQUILA project

The European project TEQUILA (IST-1999-11253) stands for Traffic Engineering for Quality of Service in the Internet, at Large Scale. TEQUILA's main objective is to study, specify, implement and validate service definition and Traffic Engineering tools for the Internet. The TEQUILA system should provide both quantitative and qualitative service guarantees through planning, dimensioning and dynamic control of traffic management techniques based on DiffServ. The project addresses the following technical areas: (a) Specification of static and dynamic, intra- and inter-domain SLSs (Service Level Specification). (b) Protocols and mechanisms for negotiating, monitoring and enforcing SLSs. (c) Intra- and inter-domain traffic engineering schemes to ensure that the network can cope with the contracted SLSs - within domains, and in the Internet at large.

More information is available at

SLS related standardisation efforts in the IETF

Members of the TEQUILA project introduced a first Internet Draft ("SLS - contents, parameters and semantics") on the SLS topic in June 2000. A second version of this draft and a proposal for a "Service Level Usage and Specification Framework " has been produced. These drafts together with two other proposals of AT&T and the IST-AQUILA project are currently discussed on a public mailing list: .To subscribe to the list send an email to with the sentence: subscribe in the body and nothing in the subject line. 

More information on the SLS related standardisation efforts can be found in

Maintained by TERENA. For further inquiries about the workshop, please contact