Re: The function return true but it could not be export

7 Jun 2021

      Hi everyone ,I'm using bird2.I wanna export 2602:feda:ab2::/48 from LL_IX
to TOHU_IX.
LL_IX      BGP        ---        up     12:24:16.896  Established
TOHU_IX    BGP        ---        up     12:14:34.736  Established

bird> show route protocol LL_IX where bgp_path.len = 0
Table master6:
2602:feda:ab2::/48   unicast [LL_IX 12:26:32.410] * (100) [i]
       via 2602:feda:ab2::1 on ll-ix

So it returns True.

bird> show route noexport TOHU_IX for 2602:feda:ab2::/48 all
bird> show route export TOHU_IX for 2602:feda:ab2::/48 all

But the prefix is not in export or noexport
The configuration of the export filter is,So i think that must be exported.
export filter {
if bgp_export_all() then accept;
# if (roa_check(r6, net, bgp_path.last_nonaggregated) ~ [ROA_INVALID,
ROA_UNKNOWN]) then reject;
# if is_bogon_asn() then reject;
# if is_bogon_prefix() then reject;
# accept;
};

bird> show route for 2602:feda:ab2::/48 all where bgp_export_all()
Table master6:
2602:feda:ab2::/48   unicast [LL_IX 12:26:32.410] * (100) [i]
       via 2602:feda:ab2::1 on ll-ix
       Type: BGP univ
       BGP.origin: IGP
       BGP.as_path:
       BGP.next_hop: 2602:feda:ab2::1
       BGP.local_pref: 100
bird>

Why?

On Sun, Jun 6, 2021 at 5:58 PM Maria Matějka <maria.matejka@nic.cz> wrote:
...
Hello!
I'd try:
* "show route noexport all" to see what may be the reason to drop the route
* add some logging to the filter to see why it is dropped
BTW, what version are you using? As far as I remember, the BGP attributes
are behaving differently on export in 1.6 and 2.0
Maria
On June 6, 2021 5:24:38 AM GMT+02:00, "智慧雨泽" <zhihuiyuze@gmail.com> wrote:
...
Hi,The function i wrote correctly returns net.
bird> show route 2602:feda:ab2::/48 where bgp_export_all()
Table master6:
2602:feda:ab2::/48   unicast [LL_IX 02:19:31.236] * (100) [i]
       via 2602:feda:ab2::1 on ll-ix
But it could be export.
bird> show route export TOHU_IX for 2602:feda:ab2::/48
bird>
I think that should be accept
export filter {
if bgp_export_all() then accept;
# if (roa_check(r6, net, bgp_path.last_nonaggregated) ~ [ROA_INVALID,
ROA_UNKNOWN]) then reject;
# if is_bogon_asn() then reject;
# if is_bogon_prefix() then reject;
# accept;
};
};
}
Why is it not exported?
The full configuration is.
protocol bgp TOHU_IX {
local as LOCAL_ASN;
description "tohu ix IX-VPS BGP";
direct;
source address 2602:feda:ab5::1;
neighbor 2602:feda:ab6::1%'tuhu-ix' as 141011;
ipv6 {
next hop self;
import filter {
if is_bogon_asn() then reject;
if is_bogon_prefix() then reject;
if (roa_check(r6, net, bgp_path.last_nonaggregated) = ROA_VALID) then
reject;
accept;
};
export filter {
if bgp_export_all() then accept;
# if (roa_check(r6, net, bgp_path.last_nonaggregated) ~ [ROA_INVALID,
ROA_UNKNOWN]) then reject;
# if is_bogon_asn() then reject;
# if is_bogon_prefix() then reject;
# accept;
};
};
}
function bgp_export() {
if net !~ OUR_PREFIXES then return false;
if is_bogon_asn() then return false;
if is_bogon_prefix() then return false;
if net_len_too_long() then {
# print "net ", net, " prefix too long";
return false;
}
if proto = "BGP_Prefix" then return true;
if proto = "LL_IX" then{
if bgp_path.len = 0 then{
return true;
}
}
if proto = "TOHU_IX" then{
if bgp_path.len = 0 then{
return true;
}
}
return false;
}
function bgp_export_all() {
if bgp_export() then {
return true;
}
if source != RTS_BGP then{
return false;
}
if is_bogon_asn() then return false;
if is_bogon_prefix() then return false;
return true;
}