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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.
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.
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.
This layer provides additional space for IX labels.
Continent bars are sorted on the y axis by their longitude.
Horizontally, a bar spans all IXes found in a corresponding
Image Data Source:
This visualization is based on the data gathered by CAIDA Macroscopic
Topology Project. Our
skitter tool 
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
maintained by Packet Clearing House . For all
remaining IP addresses we determined their origin ASes using
BGP tables 
Route Views .
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