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

["William Herrin" <bill@herrin.us>]

On Mon, Jul 21, 2008 at 9:58 AM, Iljitsch van Beijnum
<iljitsch@muada.com> wrote:
> On 21 jul 2008, at 15:52, William Herrin wrote:
>
>> Found the breach. Look at http://bill.herrin.us/network/geoag-i1.gif
>
> Does this preempt your earlier message or add to it?

Adds to it.

> What do the green arrows mean?

Green arrows indicate payment of money or some other consideration in
exchange for "Internet Service." The arrow points towards the ISP
receiving payment.

The permission rule is: For any packet transiting the network, there
must be a trail of green arrows to every node it transits from either
the packet's source or its destination.

In the diagram, nodes C and G are two "Tier 1" backbone providers: all
other nodes either pay them or peer with them.


> Are the letters ASes or are the letters routers with the blue shapes their
> AS?

The letters can be treated as ASes. The blue circles indicate
geographic regions in which addresses are allocated from an aggregable
block. According to your algorithm, the nodes outside a block should
opportunistically aggregate any routes it can for that block.

Regards,
Bill Herrin


-- 
William D. Herrin ................ herrin@dirtside.com bill@herrin.us
3005 Crane Dr. ...................... Web: <http://bill.herrin.us/>
Falls Church, VA 22042-3004

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