Hi,

I need to remove two As numbers per bgp_path

You can use a set as a second parameter. From the documentation: "delete(P,A) ... A may also be an integer set". On Fri, Jan 4, 2019 at 3:37 AM Xavier Trilla <xavier.trilla@clouding.io> wrote:

Hi Alexander,

That’s interesting I will play with this syntax, although I’m not 100% sure if I will be able to use it (I need to remove two As numbers per bgp_path) but maybe I can work something out.

Thanks! Xavier

El 4 gen 2019, a les 1:47, Alexander Zubkov <green@qrator.net> va escriure:

...

Hi,

Something like this worked for me:

delete(bgp_path, XXXX).len < N

...

On Fri, Jan 4, 2019 at 12:19 AM Xavier Trilla <xavier.trilla@clouding.io> wrote:

Hi,

For some route selection configurations I need to check the bgp_path.len without some AS numbers.

I tried something like:

bgp_path.delete(AS_1);

bgp_path.delete(AS_2);

if bgp_path.len < N then …

But doing this I modify permanently the AS path.

I’ve tried using a temp variable, but looks like bird doesn’t allow to create bgppath “variables”.

Any ideas about how this could be achieved?

Thanks!

Xavier

This is exactly what I've been trying to do, most probably I had something wrong with the syntax and that's why it was not working, I'll test it this week. Thanks! Saludos Cordiales, Xavier Trilla P. Clouding.io<https://clouding.io/> ?Un Servidor Cloud con SSDs, redundado y disponible en menos de 30 segundos? ?Pru?balo ahora en Clouding.io<https://clouding.io/>! El 6 gen 2019, a les 1:30, Ondrej Zajicek <santiago@crfreenet.org<mailto:santiago@crfreenet.org>> va escriure: On Thu, Jan 03, 2019 at 11:10:00PM +0000, Xavier Trilla wrote: Hi, For some route selection configurations I need to check the bgp_path.len without some AS numbers. I tried something like: bgp_path.delete(AS_1); bgp_path.delete(AS_2); if bgp_path.len < N then ... But doing this I modify permanently the AS path. I've tried using a temp variable, but looks like bird doesn't allow to create bgppath "variables". Hi Although approach suggested by Alexander Zubkov is applicable, i would note that BIRD allows bgppath variables, see: filter testfilter bgppath pp; { pp = bgp_path; pp = prepend(pp, 65500); pp = prepend(pp, 65500); print pp, " ", pp.len; accept; } The only think that is strange is that operators like delete or prepend cannot be used with 'dot-syntax' (i.e. pp.prepend(X)), but must be used with 'function-syntax' (i.e. pp = prepend(pp, X)). -- Elen sila lumenn' omentielvo Ondrej 'Santiago' Zajicek (email: santiago@crfreenet.org<mailto:santiago@crfreenet.org>) OpenPGP encrypted e-mails preferred (KeyID 0x11DEADC3, wwwkeys.pgp.net<http://wwwkeys.pgp.net>) "To err is human -- to blame it on a computer is even more so."