Import filter on 2nd ASN in AS path?

[Ondrej Zajicek]

On Thu, Mar 28, 2019 at 12:25:29AM +0100, Robert Scheck wrote:
> Hello Maria,
> hello Alexander,
> 
> first of all, thank you very much for your suggestions.
> 
> On Tue, 26 Mar 2019, Maria Matějka wrote:
> > Did you try using BGP path mask? Like
> > if (bgp.path ~ [= ? bogon bogon * =]) …
> 
> I didn't try this before, but I'm now also not sure how I could get my int
> set (BOGON_ASNS) properly into your example, because just

That is unfortuately not possible (only single ASNs or ASN ranges),
although it is a thing that makes perfect sense, so we should implement
it.

> > On March 26, 2019 10:34:39 AM GMT+01:00, Alexander Zubkov <green at qrator.net> wrote:
> 1 (rather "undefined" or failing). It starts to work properly when using
> 
> if (bgp_path.len >= 2 && delete(bgp_path, [ AS-TRANSIT1, AS-TRANSIT2 ]).first ~ BOGON_ASNS) then { …
> 
> but it still leaves me with a list of transit ASNs to be fed (thus Maria's
> suggestion seems to be a more maintenance-friendly approach - if int sets
> could be used somehow).

What about: delete(bgp_path, bgp_path.first).first ?

-- 
Elen sila lumenn' omentielvo

Ondrej 'Santiago' Zajicek (email: santiago at crfreenet.org)
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"To err is human -- to blame it on a computer is even more so."