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- Network Availability and Failure Resilience (September 2001 - September 2003)
This project analyzed the failure characteristics of Sprint's IP
backbone and developed techniques and recommendations to improve
failure resilience and availability. Contributions include the design
of a novel IGP weight selection algorithm that is robust to link
failures, a novel deflection routing algorithm to counter sudden link
overloads and a detailed characterization of link failures and their
probable causes. In addition, a detailed study of IGP convergence
behavior led to a large reduction in IGP convergence times in Sprint's
network and recommendations to Cisco on router software modifications.
Selected Documents:
- A. Nucci, B. Schroeder, S. Bhattacharyya, N. Taft, C. Diot."IGP
Link Weight Assignment for Transient Link Failures." 18th
International Teletraffic Conference (ITC) 2003.[
PDF]
- A. Markopoulou, G. Iannaccone, S. Bhattacharyya, C-N. Chuah, C. Diot."Characterization of Link Failures in an IP Backbone." IEEE Infocom 2004.[
PDF]
- G. Iannaccone, S. Bhattacharyya, C-N. Chuah, C. Diot."Feasibility of IP Restoration in a Tier-1 Backbone" IEEE Networks Magazine, Special Issue on Protection, Restoration and Disaster Recovery, 2004.[PDF]
- S. Iyer, S. Bhattacharyya, N. Taft, C. Diot."An approach to alleviating link overload as observed in an IP backbone." IEEE Infocom 2003.[
PDF]
- Routing and Traffic Engineering(June 2001 - September 2003)
This work was aimed at understanding and improving the performance of
IP routing protocols and traffic engineering practices in Sprint's
network. Contributions include the development of new techniques for
estimation traffic between backbone Points of Presence (PoP) and the
analysis of the interactions between BGP, IGP and traffic dynamics.
Selected Documents:
- A. Medina, N. Taft, S. Bhattacharyya, C. Diot. "Traffic Matrix
Estimation: Existing Techniques and New Directions." ACM Sigcomm 2002.[ PDF]
- S. Agarwal, C-N. Chuah, S. Bhattacharyya, C. Diot. "Impact of BGP Dynamics on Intra-Domain Traffic." ACM Sigmetrics 2004. [ PDF]
- S. Agarwal, A. Nucci, S. Bhattacharyya, C. Diot. "Measuring the Shared Fate of IGP Engineering and Inter-Domain Traffic." International Conference on Network Protocols (ICNP) 2005 [ PDF]
- Source Specific Multicast (SSM)(October 1999 - December 2002)
Source Specific Multicast (SSM) has received widespread attention as a
service model that can address the issues hindering the commercial
deployment of IP multicast. SSM solves the global multicast address
allocation problem, reduces complexity and improves source access
control. I have played a leading role in standardizing SSM in the
IETF, as the co-chair of the SSM Working Group in the IETF. I have
been associated with the development of the first Linux host
implementaton of the Internet Group Management Protocol (IGMP) version
3. I am also the lead author of an RFC describing deployment issues
for SSM.
Selected Documents:
- S. Bhattacharyya (editor). "An Overview of Source-Specific Multicast". IETF RFC 3569. [ TEXT]
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