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