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Autonomous System (AS) connectivity between Internet eXchanges (IX) in 2002

Visualization of Autonomous Systems (AS) inter-connections between Internet eXchange points (IX) in 2002.

    Image Key:

Image Key
  • AS layer Each horizontal line represents an AS. (AS labels are provided in a larger scale image). Vertical lines connecting the AS lines and the IX bars in the layer below show the presence of a given AS at a given IX. ASes that are present at only one IX and do not provide any inter-IX connections are omitted from the visualization.
    Vertically, AS lines are grouped by the number of continents they connect. Those nearest to the IX layer connect IXes within a single continent. These intra-continental AS lines are colored by the color of a corresponding continent. Lines depicting ASes providing inter-continental connections are white. The more continents they connect (up to 4) the higher is their position in the image.

  • IX layer Each bar represents an IX. The length of a bar is proportional to the number of ASes present at this IX (and connecting it to at least one other IX). IXes are ordered on the x axis by their longitude. When space allows, IX labels are written on their corresponding bars. Otherwise, IX labels are placed below their corresponding bar, in the label layer.

  • Label layers This layer provides additional space for IX labels.

  • Continent layers Continent bars are sorted on the y axis by their longitude. Horizontally, a bar spans all IXes found in a corresponding continent.

    Image Data Source:

This visualization is based on the data gathered by CAIDA Macroscopic Topology Project. Our skitter tool [1] collected forward IP paths between skitter monitor hosts and a large number of target destinations. Among IP addresses seen in these paths we identified addresses belonging to IXes using the IX database maintained by Packet Clearing House [2]. For all remaining IP addresses we determined their origin ASes using BGP tables [3] from Route Views [4]. The image shows all links between IXes and ASes we found in skitter traces during the period from 2002/10/01 to 2002/10/07

click to enlarge
all links between IXes and ASes found from 2002/10/01 to 2002/10/07 (click to enlarge)


[1] CAIDA's skitter tool
[2] Packet Clearing House's Internet eXchange point data base
[3] K. Lougheed and Y. Rekhter., RFC 1106, "Border Gateway Protocol (BGP)"
[4] Meyer, D. University of Oregon Route Views Project.

Additional Content

Visualization of Autonomous Systems (AS) interconnections between InterneteXchange points (IX).

This shows the interconnections provided by Autonmous Systems (AS) between Internet eXchanges (IX).

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