Review my BGP configuration

Hans van Kranenburg hans.van.kranenburg at
Mon Mar 25 23:54:49 CET 2013


On 03/25/2013 02:35 PM, Andre Nathan wrote:
> On Sat, 16 Mar 2013, Hans van Kranenburg wrote:
>>> There's just one weird thing I'm seeing in the logs:
>>> configuration error: tried to export prefix w.z.y.x/32
>>> configuration error: tried to export prefix
>>> ...
>> Cool, I didn't use print statements yet myself, but this shows they're
>> very useful for detection of spurious route announcements,
>> misconfiguration etc. With custom messages this is easy to detect in the
>> logs.
> So, I scheduled a full restart of bird on both routers this weekend, and
> this time the "configuration error" messages didn't show up. I guess
> after a number of "configure soft" commands that I did until I finally
> finished the configuration, my routing tables weren't in the state they
> were supposed to be.

Ah, that sounds like a plausible cause of the behaviour yes. Bird does a
lot of effort to find out how configuration changed and adapt to it,
which is an awesome feature, but especially when using soft, it tries to
do its best, but will not re-evaluate changed filters to remove routes.

> Anyway, a clean restart solved the issue :)

Great! Happy to hear that.

Hans van Kranenburg - System / Network Engineer
T +31 (0)10 2760434 | hans.van.kranenburg at |

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