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Re: BGP Filtering

  • From: Jon Lewis
  • Date: Sat Jan 19 12:54:30 2008

On Sat, 19 Jan 2008, Andy Davidson wrote:

On 15 Jan 2008, at 16:11, Ben Butler wrote:

As a transit consumer - why would I want to carry all this cr*p in my
routing table, I would still be getting a BGP route to the larger prefix
anyway - let my transit feeds sort out which route they use & traffic
engineering.

Maybe you don't get covering aggregates. That causes holes. Whether you care is a matter of local policy, though. :-)

There's no maybe about it. Filtering on RIR minimums will result in the more clue deprived networks disappearing from your view and a loss of reachability unless you have default pointed at some network not using such a filter.

Since I've gotten several requests recently for the "latest version" of what I posted back in September (I guess others are starting to get worried/close to their limits), I decided this was a good time to setup some blog software (late last night)...and I posted the filter and a brief intro to http://jonsblog.lewis.org/

----------------------------------------------------------------------
 Jon Lewis                   |  I route
 Senior Network Engineer     |  therefore you are
 Atlantic Net                |
_________ http://www.lewis.org/~jlewis/pgp for PGP public key_________