question about AS relationship

William Herrin bill at
Thu Feb 20 18:58:06 UTC 2014

On Thu, Feb 20, 2014 at 3:14 AM, Song Li <refresh.lsong at> wrote:
> I have one simple question: as for AS relationship, should customer tell its
> provider the AS# of its own customers, or the provider have the right to
> require its customers to do that?

Um... you DO tell your provider the AS numbers of your customers... in
the BGP route announcement you send them. It's not a question of
rights or requirements. You already do it. Because that's how the
technology works.

As Chris noted, telling your provider out-of-band before sending the
same information via BGP is also a very good idea which enhances the
security of the whole doggone Internet.

Bill Herrin

William D. Herrin ................ herrin at  bill at
3005 Crane Dr. ...................... Web: <>
Falls Church, VA 22042-3004

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