| So what was
the big problem? |
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| • | We mark routes
from upstreams with bgp |
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| communities, and
use them to subset which |
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| routes are
advertised to downstream customers. |
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| • | Eg, everyone gets
Abilene, Dren, Esnet, MAX, |
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| but only a few
get vBNS (yes, we still have) |
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| • | Started out doing
same w/ ISP : bgp community |
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| to control Qwest
route advertisement. |
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| • | Then discovered
that we were blackholing traffic |
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| from certain
non-Qwest customers eg NLM. |
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