[c-nsp] BGP prefix announcement question..

[Garry]

Drew Weaver wrote:
>                 Hi there, there appear to be a few different ways (I'd almost say "many") to announce/filter BGP prefix announcements between neighbors these days (I'm speaking specifically about Internet edge neighbors here i.e. company to internet transit provider), I am trying to see if there has ever been defined a 'standard' way to do it which makes things like employing Blackhole communities (on the side of the corporation) a little less painful than cutting your own teeth with a spoon.
>   
Well, for a CE site announcing under their own AS it's pretty easy - 
just set up a prefix filter with the network(s) you wish to announce ...
On the PE, it's a more complicated, depending on whether you have _lots_ 
of BGP customers and therefore prefer some kind of automatic filter 
deployment, or just a hand full, allowing the tech folks to set up the 
filters manually - the latter case is the same as with a CE site, while 
possibly also adding an AS filter, ensuring that only the customer's AS 
is announced by them ...

As for automatic filters by using a routing database, I'm still looking 
for a tool myself ;)

-gg