Hi.

For this situation we may have more solutions.

You can do the check only on routes that have bgp_path defined.

You can add:

if defined (bgp_path)...

It also seems, that you are using this in an export filter. It might be more useful to use this in a BGP import filter. In that case every route will have bgp_path defined.

I hope this helps.
Happy routing,
Jana

Jana Babovakova (she/her) | BIRD Tech Support | CZ.NIC, z.s.p.o.

On 22. 05. 25 3:41, ushiroz@ate-mahoroba.jp wrote:

Hi,

In our BIRD 2.14 we’re running roa_check like this:

  if (net.type = NET_IP4) then {
    case roa_check(r4, net, bgp_path.last) {

However, the BIRD logs show the following error:

<ERR> filters, line 1: Missing AS_PATH attribute

would it be advisable to add a check to determine whether the route is a BGP route before proceeding?