The function return true but it could not be export

[智慧雨泽]

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 at 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 at 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;
>> }
>>
>>
>>
>>
>>
>>
>>
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