[c-nsp] IOS XR BGP

[Gert Doering]

Hi,

On Mon, Nov 28, 2011 at 06:44:48PM -0500, Keegan Holley wrote:
> 2011/11/28 Gert Doering <gert at greenie.muc.de>
> > On Mon, Nov 28, 2011 at 11:41:08AM -0500, Keegan Holley wrote:
> > > That wasn't centered around aggregates and no.  Some of us don't run
> > > gigantic intercontinental ISP's :) So yes us lowly Tier-II and Tier-III
> > > AS's may on occasion learn our own routes from an external connection.
> >
> > These lowly ASes urgently need to implement anti-bogon filters on their
> > eBGP sessions.  NEVER EVER accept prefixes belonging to your address
> > space from the outside.
>
> That's crap.  

In that case: "I encourage all my competitors to do so".

What's your AS number?  Shall we see what happens if I announce the /24 
with your name servers in it?  (Except that I'm a good guy, and would
never do that, of course).

> You will need to do it to have customers multi-home with your
> ARIN space for one.  Secondly those outside AS's may belong to your company
> a sister company or an acquisition and you may want to use the eBGP path as
> a backup. 

Of course there are valid exceptions.  But they should be *exceptions*.

ASes relying on "nobody will do that" or (even worse) relying on vague
and ill-understood BGP preferences will just feel the pain some day.

gert
-- 
USENET is *not* the non-clickable part of WWW!
                                                           //www.muc.de/~gert/
Gert Doering - Munich, Germany                             gert at greenie.muc.de
fax: +49-89-35655025                        gert at net.informatik.tu-muenchen.de
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 305 bytes
Desc: not available
URL: <https://puck.nether.net/pipermail/cisco-nsp/attachments/20111129/c9ca77dc/attachment.sig>