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Re: [RRG] Geographic aggregation-based routing is at odds with reality



On 21 jul 2008, at 16:59, William Herrin wrote:

According to your algorithm, the nodes outside a block should
opportunistically aggregate any routes it can for that block.

No, aggregation is local to an AS.

Then you only perform aggregation in origin-only ASes (like A, D, E
and H in the diagram) and don't attempt to aggregate in the others?

No, of course not. Aggregation in origin-only ASes is not the main issue, because those ASes don't necessarily have to run default-free.

The point is aggregation in the tier-1 service provider networks where default routes can't be used.

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