BGP Filtering
Jon Lewis
jlewis at lewis.org
Sat Jan 19 17:52:03 UTC 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 |
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