The Experts below are selected from a list of 174 Experts worldwide ranked by ideXlab platform
Fouad A Tobagi - One of the best experts on this subject based on the ideXlab platform.
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design and deployment of a passive monitoring infrastructure
Lecture Notes in Computer Science, 2001Co-Authors: C Fraleigh, Christophe Diot, Bryan Lyles, Sue Moon, Dina Papagiannaki, Philippe Owezarski, Fouad A TobagiAbstract:This paper presents the architecture of a passive monitoring system installed within the Sprint IP Backbone network. This system differs from other packet monitoring systems in that it collects packet-level traces from multiple links within the network and provides the capability to correlate the data using highly accurate GPS timestamps. After a thorough description of the monitoring systems, we demonstrate the system's capabilities and the diversity of the results that can be obtained from the collected data. These results include workload characterization, packet size analysis, and packet delay incurred through a single Backbone Router. We conclude with lessons learned from the development of the monitoring infrastructure and present future research goals.
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IWDC - Design and Deployment of a Passive Monitoring Infrastructure
Lecture Notes in Computer Science, 2001Co-Authors: C Fraleigh, Christophe Diot, Bryan Lyles, Sue Moon, Dina Papagiannaki, Philippe Owezarski, Fouad A TobagiAbstract:This paper presents the architecture of a passive monitoring system installed within the Sprint IP Backbone network. This system differs from other packet monitoring systems in that it collects packet-level traces from multiple links within the network and provides the capability to correlate the data using highly accurate GPS timestamps. After a thorough description of the monitoring systems, we demonstrate the system's capabilities and the diversity of the results that can be obtained from the collected data. These results include workload characterization, packet size analysis, and packet delay incurred through a single Backbone Router. We conclude with lessons learned from the development of the monitoring infrastructure and present future research goals.
Manish Karir - One of the best experts on this subject based on the ideXlab platform.
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flamingo visualizing internet traffic
Network Operations and Management Symposium, 2006Co-Authors: J. Oberheide, M. Goff, Manish KarirAbstract:In this paper we describe a set of visualization techniques that can help the task of operating and managing a network by representing network traffic information in a concise and intuitive manner. We have implemented these visualization techniques in Flamingo, a software tool that can be used to explore Internet traffic flow data. Flamingo is able to process live Netflow data in real-time and present a set of interactive visualizations and associated manipulation tools that can help users in network data analysis. Flamingo is comprised of a server and a client component. The Flamingo server is responsible for receiving raw Netflow feeds from devices in the network that can sample traffic, and then sending processed information to the client for display. The Flamingo client receives data from the server and provides concise intuitive data visualizations, 3D space navigation, as well as filtering capabilities that can help the operator to extract or monitor specific information of interest. Flamingo also supports a playback mode which allows users to select specific historical Netflow data for visualization. We illustrate with the help of simple examples, based on traffic data from a busy Internet Backbone Router, how Flamingo can be used to perform network monitoring tasks as well as network security related data forensics.
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NOMS - Flamingo: Visualizing Internet Traffic
2006 IEEE IFIP Network Operations and Management Symposium NOMS 2006, 2006Co-Authors: J. Oberheide, M. Goff, Manish KarirAbstract:In this paper we describe a set of visualization techniques that can help the task of operating and managing a network by representing network traffic information in a concise and intuitive manner. We have implemented these visualization techniques in Flamingo, a software tool that can be used to explore Internet traffic flow data. Flamingo is able to process live Netflow data in real-time and present a set of interactive visualizations and associated manipulation tools that can help users in network data analysis. Flamingo is comprised of a server and a client component. The Flamingo server is responsible for receiving raw Netflow feeds from devices in the network that can sample traffic, and then sending processed information to the client for display. The Flamingo client receives data from the server and provides concise intuitive data visualizations, 3D space navigation, as well as filtering capabilities that can help the operator to extract or monitor specific information of interest. Flamingo also supports a playback mode which allows users to select specific historical Netflow data for visualization. We illustrate with the help of simple examples, based on traffic data from a busy Internet Backbone Router, how Flamingo can be used to perform network monitoring tasks as well as network security related data forensics.
A L Chiu - One of the best experts on this subject based on the ideXlab platform.
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IP over optical layer restoration: architecture, design, and analysis
Optical Transmission Switching and Subsystems III, 2005Co-Authors: A L Chiu, John Lester StrandAbstract:Optical layer capacity and unit cost improvements are basic to the rapid growth of IP networks. However, the new rapid reconfiguration and restoration capabilities of the optical layer have been sparingly utilized by IP network operators. This is consistent with the economics: the widely deployed optical layer architecture based on a "discrete" optical crossconnect (DOXC - one not integrated into the WDM) incurs heavy interface costs. In addition, there are architectural and control issues which are roadblocks to IP exploitation of rapid optical layer agility. In the first part of the paper, we describe a next generation all-optical architecture based on OXCs integrated with the WDM ("IOXCs"), and one instantiation of this architecture using a class of reconfigurable degree-N optical add-drop multiplexer (OADM). A new shared mesh restoration mechanism based on hot standbys is designed to overcome slow convergence and transient behaviors that are typical in all-optical networks. A series of economic comparisons are made on both a 120-node hypothetical national network and a smaller express Backbone network to demonstrate the cost effectiveness of the new IOXC-based restoration in comparison to the IP layer restoration after some optical layer failure that results in one or more IP link failures. In the IP over Optical architecture, the Optical Layer can provide its IP clients rapid and efficient restoration for IP link failures that are due to some optical layer failure; however its inability to protect against Router and Router interface failures erodes its attractiveness. In the second part of the paper, we propose a joint IP/Optical restoration mechanism to deal with this. It is suitable for IP offices with at least two Backbone Routers and an optical cross-connect. The OXC is used to re-terminate OC-48/OC-192 links from a failed Backbone Router to its mate. The entire interoffice portion of the re-terminated link is reused, thus minimizing the amount of additional inter-office capacity required to protect against Router failures. The proposed scheme is also applicable to restoration for Router interface failures as well as to cases with single Backbone Router office architecture.
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an agile optical layer restoration method for Router failures
IEEE Network, 2003Co-Authors: A L Chiu, J StrandAbstract:The optical layer can provide its IP clients with rapid and efficient restoration for link failures; however, its inability to protect against Router failures erodes its attractiveness. Here, we propose a joint IP/optical restoration mechanism suitable for IP offices with a minimum of two Backbone Routers and an optical cross-connect. The OXC is used to reterminate OC-48/OC-192 links from a failed Backbone Router to its mate. The entire interoffice portion of the reterminated link is reused, thus minimizing the amount of additional link capacity required to protect against Router failures. A similar approach applicable when there are tunable transceivers but no OXC is also described.
C Fraleigh - One of the best experts on this subject based on the ideXlab platform.
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design and deployment of a passive monitoring infrastructure
Lecture Notes in Computer Science, 2001Co-Authors: C Fraleigh, Christophe Diot, Bryan Lyles, Sue Moon, Dina Papagiannaki, Philippe Owezarski, Fouad A TobagiAbstract:This paper presents the architecture of a passive monitoring system installed within the Sprint IP Backbone network. This system differs from other packet monitoring systems in that it collects packet-level traces from multiple links within the network and provides the capability to correlate the data using highly accurate GPS timestamps. After a thorough description of the monitoring systems, we demonstrate the system's capabilities and the diversity of the results that can be obtained from the collected data. These results include workload characterization, packet size analysis, and packet delay incurred through a single Backbone Router. We conclude with lessons learned from the development of the monitoring infrastructure and present future research goals.
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IWDC - Design and Deployment of a Passive Monitoring Infrastructure
Lecture Notes in Computer Science, 2001Co-Authors: C Fraleigh, Christophe Diot, Bryan Lyles, Sue Moon, Dina Papagiannaki, Philippe Owezarski, Fouad A TobagiAbstract:This paper presents the architecture of a passive monitoring system installed within the Sprint IP Backbone network. This system differs from other packet monitoring systems in that it collects packet-level traces from multiple links within the network and provides the capability to correlate the data using highly accurate GPS timestamps. After a thorough description of the monitoring systems, we demonstrate the system's capabilities and the diversity of the results that can be obtained from the collected data. These results include workload characterization, packet size analysis, and packet delay incurred through a single Backbone Router. We conclude with lessons learned from the development of the monitoring infrastructure and present future research goals.
J Strand - One of the best experts on this subject based on the ideXlab platform.
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an agile optical layer restoration method for Router failures
IEEE Network, 2003Co-Authors: A L Chiu, J StrandAbstract:The optical layer can provide its IP clients with rapid and efficient restoration for link failures; however, its inability to protect against Router failures erodes its attractiveness. Here, we propose a joint IP/optical restoration mechanism suitable for IP offices with a minimum of two Backbone Routers and an optical cross-connect. The OXC is used to reterminate OC-48/OC-192 links from a failed Backbone Router to its mate. The entire interoffice portion of the reterminated link is reused, thus minimizing the amount of additional link capacity required to protect against Router failures. A similar approach applicable when there are tunable transceivers but no OXC is also described.
