[j-nsp] Am I carrying this route or not ?

[Zehef Poto]

Hey guys,

Thank you all for the very valuable input. Actually yes, Tobias is right,
I'm having this question because of the (quoted by Tobias) e-mail we got
yesterday across several IXPs.

I just don't understand what is to "carry a route in my backbone". Am I not
supposed to know all of (or most of) the Internet routes, since I work with
tier-1 upstream providers ? As a consequence, it means I'm carrying all
these routes right ?

A "show route X/22" tells that it was advertised by an eBGP peer on one of
my edge routers, and the three other ones learnt this same route via OSPF.

This is where I'm completely confused. What am I supposed to do to "carry"
a route or not ?

Thanks again,

2013/3/24 Tobias Heister <lists at tobias-heister.de>

> Hi All,
>
> Am 24.03.2013 00:26, schrieb Jeff Wheeler:
> > Whoever that person is that said something about "use next-hop-self"
> > in this context, either you misunderstood them, or you shouldn't
> > listen to them anymore.  That has nothing to do with looking to see if
> > your router knows about a route.
>
> This sounds like the OP wants to help the cloudfare guys who send the
> following mail to DECIX/AMSIX (and probably other IX) yesterday.
>
> > We're currently seeing a very large attack directed to our IP on AMS-IX
> (X).
> >
> > We request that all peers:
> >
> > 1) Don't carry this route (X/22) in your backbone. (you can set
> next-hop-self, etc). It'll save other security concerns and possible free
> transit you're giving away to others.
> > 2) Filter any traffic within to the AMS-IX exchange fabric (again,
> X/22), except for your point to [multi]point BGP communications.
>
> --
> Kind Regards
> Tobias Heister
>