Claudio,

Thanks for your very comprehensive reply, I just wanted to make sure it
wasnt an oversight

Thanks again,

Tom Smyth

On Fri, 24 Oct 2025 at 07:42, Claudio Jeker <cjeker@diehard.n-r-g.com>
wrote:

> On Fri, Oct 24, 2025 at 04:56:50AM +0100, Tom Smyth wrote:
> > Folks,
> >
> >
> > I noticed  while audting config differences between  older bgpd router
> and
> > a newer one
> >
> > that in the section " # filter bogon AS numbers" the line  filtering  AS
> 0
> > was removed
> > when people summarised / reduced the verbosity of the different bogon AS
> > numbers,
> >
> > deny quick from any AS 0                              # Reserved for
> other
> > use
> >
> > should this line be re-introduced to the example ?
>
> Not necessary. AS 0 is not allowed in an ASPATH and results in the UPDATE
> to be treated as a withdraw. See also RFC 7607 on how AS 0 is handled.
>
> --
> :wq Claudio
>


-- 
Kindest regards,
Tom Smyth.