route withdrawals are not sent upon protocol removal

[Thomás S. Bregolin]

On Wed, Jun 6, 2018 at 1:59 PM, Thomás S. Bregolin <thoms3rd at gmail.com>
wrote:

> On Wed, Jun 6, 2018 at 1:33 PM, Thomás S. Bregolin <thoms3rd at gmail.com>
> wrote:
>
>> Hello,
>>
>>
>> On Tue, Jun 5, 2018 at 3:43 PM, Thomás S. Bregolin <thoms3rd at gmail.com>
>> wrote:
>>
>>> On Tue, Jun 5, 2018 at 2:13 PM, Jan Maria Matejka <jan.matejka at nic.cz>
>>> wrote:
>>>
>>>> Could you please try the attached script or try to create some
>>>> reproducer for me
>>>> to see the bug clearly?
>>>>
>>>
>>> I will give the test-withdraw script a go and reply with more
>>> information.
>>>
>>
>> I've attached a modified version of the test-withdraw script showing the
>> issue. It seems my problem is related to the "start delay time" option.
>> When I set it to 1, sometimes the withdrawal is sent, and sometimes it
>> isn't. However, when it *isn't* sent, it is *never* sent, no matter how
>> long I wait. The problem is solved by setting the timeout to a higher
>> value, or using the default 5 seconds.
>>
>> I am no longer sure if this is a bug or not. Please let me know if you
>> would like more information about this.
>>
>
> P.S.: removing the time delay solves the issue in the test script, but not
> in my production environment. Seem I have some more debugging to do.
>

Some debug logs with a "start delay time" of 20 seconds:

Jun 06 13:11:47 m03 bird[28196]: Reconfiguring
Jun 06 13:11:47 m03 bird[28196]: Removing protocol e_route_20
Jun 06 13:11:47 m03 bird[28196]: kernel1: Reconfigured
Jun 06 13:11:47 m03 bird[28196]: device1: Reconfigured
Jun 06 13:11:47 m03 bird[28196]: bgpint: Reconfigured
Jun 06 13:11:47 m03 bird[28196]: Reconfigured

You can see the protocol is removed but the prefixes are not withdrawn;
there are no "bird[28196]: cf_bgplan < removed ... via ... on ..." messages.


- Thomás
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