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.
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El 6 gen 2019, a les 1:30, Ondrej Zajicek 
<[email protected]<mailto:[email protected]>> 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: 
[email protected]<mailto:[email protected]>)
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."

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