Quick suggestion about enable/disable protocol

[Alexander Zubkov]

Hi,

In the meanwhile, you can use my patch, so that bird shouldn't change
protocol states when you do "configure soft". There is a link in my
presentation (slide 6):
https://ripe81.ripe.net/archives/video/479/
There are some other patches you might find interesting too.

On Wed, Dec 1, 2021, 08:08 <bird21 at sensation.net.au> wrote:

> Hi!
>
> On Wed, 1 Dec 2021, Maria Matejka wrote:
>
> >> 1. Allow enable/disable to be part of the config, so that a protocol
> can be
> >> disabled by default, and needs a manual poke via CLI command to enable
> it.
> [...]
>
> > This is already in config, use "enabled" and "disabled" keywords.
>
> Aha! I didn't find that previously in the docs - of course now I can see
> it. I did try "disable" as per the CLI command, but obviously that
> slightly different directive doesn't work. Perhaps a note could be added
> to the CLI docs to mention that it can be set semi-permanently in the
> config?
>
> >> 2a. When reloading config, preserve the current state of a protocol
> that
> >> has been disabled. (I'm trying to debug a config, which involves
> disabling
> [...]
>
> > We don't like to change what BIRD does by default as it may confuse
> others
> > who aren't familiar with the changes and both variants of behavior have
> their
> > appropriate use. Yet we may consider something like  a "keep protocol
> states"
> > option to explicitly disable protocol disabling/enabling on config
> reload.
>
> Yes, I did intend to mean that it would be an option, rather than a
> (potentially dangerous) change in default behaviour. For now, I'll just
> try to remember to uncomment "disabled" in the block before I start
> fiddling. :)
>
> Whilst I have your attention, there is one other thing that doesn't seem
> to be explicitly mentioned in the docs: what happens when you have
> multiple import/export filters listed for the one protocol? Does the first
> accept/reject win, and exit any further filter processing, or is there
> some other behaviour? Are the multiple filters evaluated in config order,
> or some other order?
>
> Initially I was trying to make separate filters for 0.0.0.0/0 and
> x.x.x.0/24, for import and export via BGP respectively, and combine them
> to allow both routes to be advertised locally (without needing a third
> filter)... but it doesn't work, possibly because both filters have an
> unconditional reject at the end.
>
> Thanks!
>
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