Long BGP AS paths

Sat Sep 30 22:44:54 UTC 2017

On Sat, 30 Sep 2017 at 15:33, William Herrin <bill at herrin.us> wrote:

> To the chucklehead who started announcing a 2200+ byte AS path yesterday
> around 18:27 EDT, I beg of you: STOP. You've triggered a bug in Quagga
> that's present in all versions released in the last decade. Your
> announcement causes routers based on Quagga to send a malformed update to
> their neighbors, collapsing the entire BGP session. Every 30 seconds or so.
>
> For everyone else: please consider filtering BGP announcements with
> stupidly long AS paths.

Nowhere in the BGP RFCs it says it is okay for the software to crash. Bugs
happen. You patch and move on. :-)

>