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Current Global View Aggregation of the Topology Views from Multiple Routers |
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Current Global View Aggregation of the Topology Views from Multiple Routers |
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| 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: |
| 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. go top |
| 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. go top |
| Comments and Suggestions: <prash@caida.org> Last Modified: |