Current Combined Internet2 View
Aggregation of the Topology-Views from Internet2 Routers



Map of an Aggregated view of the MBGP Topology

 

The views of the MBGP topology at different routers are usually not the same. The distinctions in the views originate because of differences in the peering relationships and the differences in the policy being enforced on the AS to which the router belongs. Many a times, it is argued that it does not make sense to aggregate two MBGP topologies and to try to overlay them on the same display. This argument originates from the fact that as the topologies seen at different routers might be totally independent of each other, it does not make sense to compare them. Nevertheless, our attempts at the aggregation of the topologies have shown that the visualization and analysis of the aggregate views can be very useful. Visualization not only depicts the differences in the topologies in an intuitive and easily perceptible manner, but also acts as a powerful means for problem solving. A click on the above button will load an interactive, Otter, map of the topology obtained by the aggregation of the latest views from individual routers.

More Info:
Characteristics (color-coding etc) of this map.
How to interpret and analyze the visual?
How to use Otter, the visualization tool.



Available Color Codings:
As mentioned above, the map present here represents an aggregate view that Mantra generates by aggregating different snapshots of MBGP topology as seen from different point of networks. There are several roots in this graph; one corresponding to each of the routers that we collect data from. The edges on this map are color-coded based on the set of snapshots they are present in. Each snapshot represents the view from a router that we collect data from and is assigned a unique label accordingly. A special label, "First Hop", identifies the edges that represent first hop from the routers that we collect data from. The horizontal bar charts on the right side of the legend display the statistics about number of edges that are present in each of the sets.
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Hints to interpret/analyze the visual:
Basically this map shows the connectivity of various components in the MBGP topology. Ideally every AS sub-tree shall be reachable from each of the routers (note that due to route aggregation not all the AS' might be directly accessible from a router). Please refer to the discussions section for detailed descriptions.
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Comments and Suggestions:  <prash@caida.org>

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