A tool for monitoring routing information in the Internet

The continuing rapid growth of the Internet brings us routing complexity as well as global connectivity. The volume of routing information, including inappropriate information, is getting larger. Many network administrators check the routing information in their border routers manually using the command line interface as their daily job. To reduce the burden of network administrators, a tool is desired which monitors BGP routing information and detects inappropriate routes automatically. This paper describes the design and implementation of a BGP monitor we are developing. It obtains the routing information in the Internet, logs every BGP message into a disk file for later off-line analysis, and maintains an internal routing table for on-line analysis. The on-line monitoring function is implemented as dynamic libraries in order to assimilate new functions without disrupting the peering session between the border router and the monitor