• Current Meeting Report
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Integrated Services over Specific Link Layers (issll)

NOTE: This charter is a snapshot of that in effect at the time of the 38th IETF Meeting in Memphis, Tennessee. It may now be out-of-date.

Chair(s): 

Eric Crawley <esc@baynetworks.com>
John Wroclawski <jtw@lcs.mit.edu>

Transport Area Director(s): 

Allison Mankin <mankin@isi.edu>
Allyn Romanow <allyn@eng.sun.com>

Mailing Lists: 

General Discussion:issll@mercury.lcs.mit.edu
To Subscribe: issll-request@mercury.lcs.mit.edu
Archive: ftp://mercury.lcs.mit.edu/pub/issll/mail/

Description of Working Group: 

The ISSLL Working Group defines specifications and techniques needed to implement Internet Integrated Services capabilities within specific network technologies. 

The Internet Integrated Services design, developed within the IETF by working groups such as INTSERV and RSVP, specifies extensions to the IP architecture which allow applications to request and receive a specific level of service from the internetwork, as alternatives to the current IP best-effort service class. The work of these groups has resulted in technology-independent protocols and specifications. Focused engineering work to define the mapping of these universal specifications onto specific subnetwork technologies is now required. 

At minimum, the following points must be addressed for each candidate technology:

·   Service mappings. Service mappings define the way that the link layer technology is used to provide a particular IntServ traffic management service, such as controlled-load or guaranteed-delay. 
·   Setup protocol mappings. Setup protocol mappings define how an internet- level setup protocol such as RSVP is implemented or mapped onto the link layer technology. 
·   Adaptation protocols. Adaptation protocols are used to augment the native capabilities of the link-layer technology, when this is necessary to support required Integrated Services functions. 
·   Statements of non-applicability. Statements of non-applicability describe which Integrated Service capabilities are not supported by the link layer technology under consideration.

The ISSLL WG will carry out this work for all technologies with perceived market demand and of sufficient interest to its members. To ensure timely progress on each work item the WG will employ an administrative structure based on technology coordinators, as described below. The WG expects to coordinate its activities across technologies whenever technical commonality between layer two media is apparent. The WG chairs hold primary responsibility for this coordinating role. 

WG Outputs: 

The WG is expected to produce standards-track RFC's, informational RFC's and "best-current-practices" guidelines, as required. The need for standards-track RFC's is limited both because the work of the group is focused on the engineering of existing protocols to existing link layer technologies, and because in certain cases information and guidelines will better serve the needs of a rapidly evolving technology. 

Operational Structure: 

Due to the scope of the task and the need for parallel progress on multiple work items, the WG effort is organized as follows: 

A technical coordinator will be identified and selected for each media technology adopted as a work item by the group. This person will be responsible for coordinating the technical efforts of the group with respect to that media, working with and motivating the document editors, and evangelizing the group's work within the community and relevant external organizations such as the IEEE and ATM Forum. 

Since many link layer media continue to evolve, and since that evolution may be influenced by the work of the ISSLL WG, it is expected that each technology work item will be divided into short term tasks, medium term tasks, and ongoing monitoring, as follows:

·   Short term tasks focus on using the existing technology as best as possible with no changes whatsoever. This work will accept whatever limits are imposed the link-level and IP-level technology, with the goal of creating the best solution possible within a 6-9 month timeframe. 
·   Medium term tasks focus on planned changes to the technology that are currently being standardized and may not yet be widely available Ideally this work would conclude just as the changes become available in the market. In general a 1-1.5 year timeframe is appropriate for these tasks. 
·   Monitoring focuses on tracking and advising on changes being made by others to a link layer technology, to allow it to better support the Integrated Services models and protocols. Generally, these efforts would be conducted as informal activities, rather than work items within the WG structure. The exception would be when formal cooperation between the WG and an external effort was required.

In addition to the normal responsibilities of IETF working group chairs, the ISSLL chairs hold primary responsibility for selection of coordinators, identifying areas of technical commonality and building cross-technology efforts within the group. 

Relationship to Other Working Groups: 

The ISSLL WG maintains a close working relationship with the INTSERV and RSVP WG's. Particularly, ISSLL may wish to feed back information about the effectiveness or limitations of RSVP and INTSERV work in the context of a specific technology to these groups for review. ISSLL is also expected to interact with other WG's as needed to aid in the use of particular media (e.g. IPATM, PPPEXT). 

Coordinators for initially important technologies: 

ATM Sue Thomson, set@bellcore.com Low-Speed Serial Carsten Bormann, cabo@informatik.uni-bremen.de Ethernet Token Ring Wayne Pace, pacew@raleigh.ibm.com Frame Relay Cable Modems

Goals and Milestones:

· Providing integrated services over low-bitrate links 

· IP Integrated Services with RSVP over ATM 

· Interoperation of Controlled-Load and Guaranteed-Service with ATM 

· The Multi-Class Extension to Multi-Link PPP 

· QoSPPP Framing Extensions to PPP 

· A Framework for Providing Integrated Services Over Shared and Switched LAN Technologies 

· Integrated Services over ATM LAN Emulation (LANE) Networks 

· Integrated Services over IEEE 802.1D/802.1p Networks 

· PPP in a real-time oriented HDLC-like framing

No Request For Comments 

Current Meeting Report

Written Minutes Not Received (Slides Provided) 

Slides

1. Integrated Services Over Specific Link Layers (ISSLL) – Agenda 

2. Integrated Services System for LOW bitrate environments 

3. Update Report on the Framework Document 

4. RSVP Over ATM Implementation Guidelines 

5. What Guidelines (if any) are Needed? 

Attendees List