[ixpmanager] BIRD Config Gen: Prefixes Not Being Exported; Strange Errors

[Barry O'Donovan]

>From your config file, you have:

define routeserverasn     = 327779;

This is a 32-bit ASN and so Bird is complaining because you cannot use a
32-bit ASN in standard community filters.

You really need a 16-bit ASN to run a route server and RIRs have no
issue giving 16-bit ASNs for route server purposes.

 - Barry



Kyle Spencer wrote:
> Right. Silly me. Here's the offending section:
> 
> ##
> ## Standard IXP community filter
> ##
> 
> function ixp_community_filter(int peerasn)
> {
>         if !(source = RTS_BGP) then
>                 return false;
> 
>         # it's unwise to conduct a 32-bit check on a 16-bit value
>         if peerasn > 65535 then
>                 return true;
> 
>         # Implement widely used community filtering schema.
>         if (0, peerasn) ~ bgp_community then
>                 return false;
>         if (routeserverasn, peerasn) ~ bgp_community then
>                 return true;
>         if (0, routeserverasn) ~ bgp_community then
>                 return false;
> 
>         return true;
> }
> 
> The errors specifically reference this line for both v4 and v6 instances:
> 
>      if (routeserverasn, peerasn) ~ bgp_community then
> 
> I've attached the full config file (for v4) just for reference.
> 
> IRRDB filtering is not enabled right now.
> 
> 
> --
> Cell/WhatsApp/Signal: +256790884905 <tel:0790%20884905>
> 
> On 21 Jan 2018 15:43, "Barry O'Donovan" <barry.odonovan at inex.ie
> <mailto:barry.odonovan at inex.ie>> wrote:
> 
> 
> 
> 
>     Kyle Spencer wrote:
>     > Meanwhile, BIRD's log file is flooded with this error:
>     >
>     > 2018-01-21 14:38:13 <ERR> ...
>     > 2018-01-21 14:38:14 <ERR> filters, line 74: Can't operate with value
>     > out of bounds in pair constructor
>     > 2018-01-21 14:38:14 <ERR> filters, line 74: Can't operate with value
>     > out of bounds in pair constructor
>     > 2018-01-21 14:38:14 <ERR> ...
>     > 2018-01-21 14:38:47 <ERR> filters, line 74: Can't operate with value
>     > out of bounds in pair constructor
> 
>     We'll need to see the bird config file Kyle.
> 
>     Or at least the snippet around those lines.
> 
>     I presume you're try to build a safe route server with prefix filtering?
>     Have you populated the database as per:
> 
>     http://docs.ixpmanager.org/features/irrdb/
>     <http://docs.ixpmanager.org/features/irrdb/>
> 
>      - Barry
> 
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-- 

Kind regards,
Barry O'Donovan
INEX Operations

https://www.inex.ie/support/
+353 1 531 3339