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Notes:


Note that on some router implementations, the lowest router id step in the BGP decision process is replaced by the selection of the oldest route. See e.g. : http://www.cisco.com/warp/public/459/25.shtml
Preferring the oldest route when breaking times is used to prefer stable paths over unstable paths, however, a drawback of this approach is that the selection of the BGP routes will depend on the arrival times of the corresponding messages. This makes the BGP selection process non-deterministic and can lead to problems that are difficult to debug.