[c-nsp] BGP question : What's the best way for filtering outgoing prefixes?

[Saku Ytti]

On (2011-08-19 11:50 -0400), Jon Lewis wrote:

> >While testing, I am wondering, is it standard practice to clear my
> >community strings from routes before going to peer/transit?
> 
> Yes.  You never know what special meaning various community strings
> might have to someone else.  You should set community none on routes
> you receive after you've looked at the community strings (if you
> were interested), and before sending routes to another AS unless you
> meant for them to go out with a certain community string.

I have to disagree. If you document your communities like maybe country of
origin or things of that nature, you should just pass them to transit, as other
people may find them useful for TE.
Same for ingress, you should only delete your own ASN (or other communities you
use inside your ASN) rest you should leave untouched, even if you don't care
for them, your customers might.

-- 
  ++ytti