[c-nsp] Route Aggregation and Deaggregation

[Andrew Miehs]

Sent from a mobile device

On 19/07/2012, at 17:04, "Elmar K. Bins" <elmi at 4ever.de> wrote:

> andrew at 2sheds.de (Andrew Miehs) wrote:
> 
>>> 
>> What is this "scrubbing" that you are referring to?
> 
> My guess is: Blackholing unwanted traffic on the transit side.
> 
> In that case there's a good chance of traffic towards the deaggregated
> /24 coming in via one of the other ISPs.
> 
> In order to make sure that traffic for the /24 only reaches you through
> ISP1, you would have to advertise that /24 to ISP1 and all other /24s
> in a somehow deaggregated sense (more likely /20+/21+/22+/23+/24) to
> the other ISPs.

Why that? You announce a /24 to isp3 and they announce it to the world including isp1 and isp2.

All traffic, even inside isp1 would match the path via isp3.

Andrew