Strange behaviour on filtering bgp_large_community ...

[Tim Weippert]

Hi Maria, 

i think the confusion part is, that it works on CLI in a "symmetric" way
but not in a function, that was my biggest questionmark :)

regards, 
tim

On Mon, May 15, 2023 at 01:21:46PM +0200, Maria Matejka wrote:
> Hello!
> 
> The ~ operator is not symmetric. We should probably better check its arguments or maybe even update the syntax. It basically means, when A ~ B, that A is in B.
> 
> Sorry for that confusion.
> Maria
> 
> On 15 May 2023 12:59:11 CEST, Tim Weippert via Bird-users <bird-users at network.cz> wrote:
> >Hi List, 
> >
> >maybe i'm doing something wrong, but if i use some quick and dirty
> >filter on the CLI all is working as expecting:
> >
> >show route where bgp_large_community ~ [(65000, 0, 1001)]
> >show route where (65000, 0, 1001) ~ bgp_large_community
> >
> >both get the expected results, show all routes with the specific
> >community attached.
> >
> >If i use it in a filter function to filter the routes out:
> >
> >function filter_large(int TestID)
> >{
> >  if ( bgp_large_community ~ [(65000, 0, TestID)] ) then { return false; }
> >  return true;
> >}
> >
> >i get "all" routes, if clause doesn't get catched.
> >
> >function filter_large_V2(int TestID)
> >{
> >  if ( (65000, 0, TestID) ~ bgp_large_community ) then { return false; }
> >  return true;
> >}
> >
> >with the V2 function i get what i want, filter out all routes with the
> >community attached and show all the rest.
> >
> >I'm a little confused here, because the first version of the if clause is
> >used for bgp_ext_community on several functions on my setup and working
> >as expected, only for bgp_large_community i need to switch to if clause
> >from version V2, and only in a function?
> >
> >Can someone confirm or explain this?
> >
> >regards, 
> >tim
> >
> >-- 
> >Tim Weippert
> >http://weiti.org - weiti at weiti.org
> >GPG Fingerprint - E704 7303 6FF0 8393 ADB1  398E 67F2 94AE 5995 7DD8

-- 
Tim Weippert
http://weiti.org - weiti at weiti.org
GPG Fingerprint - E704 7303 6FF0 8393 ADB1  398E 67F2 94AE 5995 7DD8