Building Differentiated Services Research Group (BUDS)



Identify major issues and investigate solutions for building, deploying and managing predictable, robust, intra- and inter-domain services based on various architectures and per-hop behaviors including those defined by the Differentiated Services IETF WG.


The Differentiated Services IETF WG has produced a set of standards-track and informational RFCs providing a good framework for implementing Differentiated Services. These documents include a set of specifications for Per-Hop Behaviors that define local (network element) treatment of data packets [1], [2], [3], [4].

Nevertheless, these specifications alone are not sufficient for architecting, implementing and deploying a set of services in production networks. The following are major issues that need to be addressed in order to make deployment of Differentiated Services possible:


In this group, we plan to address all the above issues. More specifically, the following are first priority goals:

As a second priority, the following are items to work on after achieving most of the goals in the first phase. Also, the following goals need to be defined better.

The BuDS group will consult and collaborate with related IETF working groups such as DiffServ, Traffic Engineering, ISSLL, IPPM, Policy. Specifically, the BuDS group will receive suggestions to study issues related to building, deploying and managing Differentiated Services. The BuDS group will make recommendations to the relevant IETF groups for items to be standardized.


[1] An Expedited Forwarding PHB (RFC 2598).

[2] Assured Forwarding PHB Group (RFC 2597).

[3] An Architecture for Differentiated Services (RFC 2475).

[4] Definition of the Differentiated Services Field (DS Field) in the IPv4 and IPv6 Headers (RFC 2474).

Membership Policy

This group is of limited membership. A limited membership model was chosen to encourage rapid progress. Others may petition the group by sending membership requests along with goals and reasons for a membership request. The group will either approve or deny the request in a timely manner based on the current position of the group, current research requirements and the candidates request.


Victor Firoiu ( and Jon Crowcroft (


This Research Group has concluded and is no longer active.

The charter and other information on this page is provided as a record of history. Email addresses and links may no longer function.

For inquiries about this former Research Group, please email