| Routing Tables |
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| • | sets
of peers change over time |
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| • | some
peers provide different sets of information: customer, |
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| aggregated,
etc |
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| • | daily
(or hourly) snapshots may not be representative of the |
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| majority
of the day, just that time period |
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| • | different
peers have different policies for prefix filtering |
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| • | time
smear across collection period for `sho ip bgp' (query |
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| walks
live data structure) |
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| • | historical
archives (nlanr) are often truncated due to IOS |
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| TCP
bugs & collection periods were 2+ hours at times |
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| 19 |