Explicit as-path filtering (with prepending allowed)

[Wilco Baan Hofman]

On 02/10/2019 01:58, Wilco Baan Hofman wrote:
> 
> 
> On 19/09/2019 06:42, Nigel Kukard wrote:
>> Hi guys,
>> 
>> Is there perhaps an equivalent in BIRD for the following...
>> 
>> ^(65000_)+(65101_)+(65253_)+$
>> 
>> The closest I could come was the following, but I am unsure if
>> it would match if any of the networks prepend.
>> 
>> if (bgp_path ~ [= 65000 65101 65253 =])
> 
> This would be correct, but would not match routes with prepends.
> It would be useful to have this indeed.
> 
> Easiest way to implement would probably be to have a deduplicated 
> attribute with only distinct ASes in the path, something like if
> (bgp_path.distinct ~ [= x y z =]) syntax or something similar, but 
> this is not possible (correct me if I'm wrong).

Should have been: not *currently* possible (still, correct me if wrong)
:)

-- Wilco