Knowledge Base

Title Authors Last Update Category
Fairness in a data center Mikkel Hagen

Existing data centers utilize several networking technologies in order to handle the performance requirements of different workloads. Maintaining diverse networking technologies increases complexity and is not cost effective. This results in the current trend to converge all traffic into a single networking fabric. Ethernet is both cost-effective and ubiquitous, and as such it has been chosen as the technology of choice for the converged fabric. However, traditional Ethernet does not satisfy the needs of all traffic workloads, for the most part, due to its lossy nature and, therefore, has to be enhanced to allow for full convergence. The resulting technology, Data Center Bridging (DCB), is a new set of standards defined by the IEEE to make Ethernet lossless even in the presence of congestion. As with any new networking technology, it is critical to analyze how the different protocols within DCB interact with each other as well as how each protocol interacts with existing technologies in other layers of the protocol stack.

This dissertation presents two novel schemes that address critical issues in DCB networks: fairness with respect to packet lengths and fairness with respect to flow control and bandwidth utilization. The Deficit Round Robin with Adaptive Weight Control (DRR-AWC) algorithm actively monitors the incoming streams and adjusts the scheduling weights of the outbound port. The algorithm was implemented on a real DCB switch and shown to increase fairness for traffic consisting of mixed-length packets. Targeted Priority-based Flow Control (TPFC) provides a hop-by-hop flow control mechanism that restricts the flow of aggressor streams while allowing victim streams to continue unimpeded. Two variants of the targeting mechanism within TPFC are presented and their performance evaluated through simulation.

December 7, 2012 Theses
Space-Time Diagrams (PPT) Jeff Laird

used at UNH-IOL for training and discussion

December 6, 2012 White Papers
Advantages and Testing Considerations of a Converged DCB Network Presentation Peter J. Scruton

Peter participated in the 2012 Ethernet Technology Summit in San Jose, California as a panelist in one of the Sessions. The Session focus was on the Continuing Role of Ethernet in Storage.

December 4, 2012 External Links
Comparison of DCBX Versions Daniel Shea

A comparison of the baseline versus the IEEE standard versions of Data Center Bridging Capabilities Exchange.

September 11, 2012 Tutorials
Testing Home Routers for World IPv6 Launch Timothy Winters

The University of New Hampshire InterOperability Laboratory (UNH-IOL) hosted its fourth IPv6 Customer Edge (CE) Router Interoperability Test Event the week of April 16 - April 20, 2012 at its 32,000+ square-foot facility in Durham, New Hampshire. The test event brought together both users and suppliers of CE routers, also known as home router equipment. The purpose of the test event was to gain a perspective on the current status of IPv6 interoperability against the Internet Engineering Task Force (IETF) Basic Requirements for IPv6 Customer Edge Routers and support the Internet Society (ISOC) World IPv6 Launch. The eight participating vendor companies tested a total of ten distinct home router implementations throughout the week using publicly routable IPv6 addresses. Participants included Broadcom, CHT-TL IPv6 Testing Lab, D-Link, NDM Systems, Motorola Mobility LLC, Netgear, Time Warner and ZyXEL.

Observations discussed in this paper include:
* DHCP Solicits Frequency
* Renumbering
* No Default Route
* Forwarding before Address Acquisition
* DHCPv6 IA_PD & IA_NA Interactions

August 31, 2012 White Papers
Demystifying the IPsec Puzzle Sheila Frankel

Now that the Internet has blossomed into the "Information Superhighway" with its traffic and drivers becoming increasingly diverse, security has emerged as a primary concern. This book offers the reader a global, integrated approach to providing internet security at the network layer. The author gives a detailed presentation of the revolutionary IPsec technology used today to create Virtual Private Networks and, in the near future, to protect the infrastructure of the Internet itself. The book addresses IPsec's major aspects and components to help the reader evaluate and compare features of different implementations. It provides a detailed understanding of this cutting-edge technology from the inside, which enables the reader to more effectively troubleshoot problems with specific products. Based on standards documents, discussion list archives, and practitioners' lore, this resource collects all the current knowledge of IPsec and describes it in a literate, clear manner.

July 10, 2012 Recommended Textbooks
IPv6 Essentials Silvia Hagen

IPv6 Essentials, Second Edition provides a succinct, in-depth tour of all the new features and functions in IPv6. It guides you through everything you need to know to get started, including how to configure IPv6 on hosts and routers and which applications currently support IPv6. The new IPv6 protocols offers extended address space, scalability, improved support for security, real-time traffic support, and auto-configuration so that even a novice user can connect a machine to the Internet. Aimed at system and network administrators, engineers, network designers, and IT managers, this book will help you understand, plan for, design, and integrate IPv6 into your current IPv4 infrastructure.

July 10, 2012 Recommended Textbooks
10BASE-T Medium Attachment Unit

An overview of the 10BASE-T Medium Attachment Unit.

July 5, 2012 Tutorials
40 Gigabit Ethernet and 100 Gigabit Ethernet Technology Overview John D’Ambrosia, Force10 Networks, David Law, 3COM, and Mark Nowell, Cisco Systems

Overview of 40 and 100 Gigabit Ethernet Technology; provided by the Ethernet Alliance, June 2010

July 5, 2012 External Links
SIP Trunk Interworking: How the SIP Forum is Improving Interoperability between SIP-PBXs and Service Providers James Swan (UNH-IOL), John Berg (CableLabs), David Hancock (CableLabs)

Interworking issues continue to be an obstacle to achieving scale on SIP Trunk deployments. Due to variances in the SIP profiles supported by different SIP Trunk products, Service Providers and vendors are forced to spend significant time and people resources to identify and resolve interworking issues for each new SIP-PBX/SSP-network combination. The SIP Forum has been actively working on multiple fronts to resolve this interworking roadblock, and to move the rollout of SIP Trunking service toward more of a plug-and-play deployment model.

This session provides a status update on two important SIP Forum initiatives in this area:

1. The SIPconnect 1.1 Recommendation: This recommendation defines a SIP profile for the SIP Trunk interface between a SIP-PBX and Service Provider network. It defines procedures to resolve common interworking issues at the SIP Trunk interface for capabilities such as security, PBX registration, and call features.

2. The SIPconnect 1.1 Interop and Compliance Program: The focus of this program is to encourage the adoption of SIPconnect 1.1 through a series on interop events, and ultimately to develop a rigorous test-platform-based compliance program that will enable vendors to indicate product compliance with SIPconnect 1.1.

July 3, 2012 External Links