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Re: Route table growth and hardware to the filter

  • From: Sam Stickland
  • Date: Tue Sep 11 10:59:36 2007

Forrest wrote:

Maybe this is a dumb question, but why isn't there a BGP option to just
filter more specific routes that have the same AS path as the larger
aggregate? This would allow the networks that announce more specifics for
traffic engineering to still accomplish that, while throwing away the
garbage from someone else that decides to announce their /19 as 33 routes
for no apparent reason. Sure, this would fail if a network decided to only announce /24's for example without a larger aggregate, but how many networks are really doing that?

There's a couple of feature requests open at Cisco that would do this. Rodney Dunn (at Cisco) pushed quite hard for these but couldn't get any traction. As he's previously pointed out it would have if people would vote for them (attach a case to).


Rodney Dunn wrote:

Take your pick. :)

CSCsa45474 Ability to block overlapping BGP prefixes from being installed in RIB

or better:

CSCsa46049 IOS RIB should not install overlapping routes with same next hop


On Tue, Oct 03, 2006 at 05:26:51PM +0200, Gert Doering wrote:

> Hi,
> > On Tue, Oct 03, 2006 at 11:09:16AM -0400, Rodney Dunn wrote:
> > I could never get them to agree to do it before and I have no reason
> > to believe anything has changed.
> > Is there a CSC number that one could attach cases to?
> > gert
> -- > USENET is *not* the non-clickable part of WWW!
> //
> Gert Doering - Munich, Germany [email protected]
> fax: +49-89-35655025 [email protected]
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