[58506] in North American Network Operators' Group
Re: Communities BCP [was: RE: BGP Path Filtering]
daemon@ATHENA.MIT.EDU (Danny McPherson)
Fri May 16 17:49:29 2003
Date: Fri, 16 May 2003 15:47:02 -0600
From: Danny McPherson <danny@tcb.net>
To: <nanog@merit.edu>
In-Reply-To: <Pine.LNX.4.55.0305161424010.1683@seatpost.its.uiowa.edu>
Errors-To: owner-nanog-outgoing@merit.edu
On 5/16/03 1:26 PM, "Jay Ford" <jay-ford@uiowa.edu> wrote:
> You can & definitely should strip those community values on announcements you
> receive from EBGP peers. Interesting things happen if you let others turn
> your routing policy knobs when you think they can't reach them.\
Agreed.
Likewise, when you receive communities (and MEDs, ugh!) [if possible] you
should reset them (v. employing 'additive'). Unnecessary propagation and/or
uniqueness of many attributes (especially transitive) can that go unnoticed
often have a significant impact on efficiencies of BGP update packing --
which subsequently impacts convergence, CPU & memory resource utilization,
etc...
-danny
