Pekka Savola wrote:
> Why exactly is advertising the aggregate a problem?  The 
> nodes will filter 
> out those sources they are auto-configured not to speak to 
> before even 
> seeing any maliscious packets.

You clearly trust your filter configuration manager. Not everyone does, and
there is ample 'operational failure from typo' evidence to back up their
mistrust.

The point is that if there is no route, there is nothing that will need to
be filtered. The security paranoid will both remove routes, and install
filters, on the belief that failures will not occur in both at the same
time. Despite the noise about not providing security, these are two
mechanisms used in basic layered security models.

Tony

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