 |
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|
|
|
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|
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| • |
because
of convergence times of peers, information for
|
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|
even
a single prefix may be inconsistent for peers
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|
| • |
even
if the internal networks of peers have converged, there
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may
be additional delay getting that information to the
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monitor
box
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| • |
since
BGP only publishes the "best" path at each AS hop,
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information
about secondary paths can be lost.
So building
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|
an AS
topology graph may not actually capture backup
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paths
or peering
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| • |
people
occasionally announce routes they shouldn't or
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deaggregate
prefixes due to misconfiguration
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|