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When Null0 and BGP May Cause Problems

If you read any networking textbook or study guide on the subject of BGP and route stability, very often you will find a mention or even a suggestion to tie your aggregated prefix to null0 to ensure that the prefix is remains in the routing table thereby increasing the stability of your BGP advertisements.

While this is a good thing, to a certain extent, there are situations where such a configuration may lead to service interruption in case of an outage.  This quick article talks a little about internet routing using BGP and some "common practices".