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Overview This section presents results based on BGP updates collected from a border router in Sprint's backbone. The updates are collected continuously by a ZebRa router (http://www.zebra.org) over an external BGP (E-BGP) session. Thus the collected information corresponds to the BGP routing updates that would be received by an Autonomous System (AS) that has a BGP peering session with the Sprint backbone. The Zebra router periodically generates a "snapshot" of the received updates which is then analyzed to obtain the results presented here. Currently, one such snapshot is generated every week. The results fall into two broad categories. In the first category we analyze each BGP table snapshot separately and derive various statistics such as BGP prefix length distribution, distribution of BGP prefixes by AS path length, etc. The second category consists of results based on analyses of data from all of the collected snapshots. This part is helpful in understanding long-term trends such as the rate of growth of the number of BGP prefixes that Sprint announces to peering ASes, or changes in AS path lengths through Sprint. |
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