prefix can't be export by BGP

[Yakov Sh.]

`show route where bgp_export() all` output states that 2602:feda:ab4::/48 prefix is unreachable. That most probably reason to not export it. As it is static route it's probably point to some interface in DOWN state, or unreachable gateway.

Yakov Sh.
telegram: @darkyman

‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Tuesday, August 17th, 2021 at 1:30 PM, 智慧雨泽 <zhihuiyuze at gmail.com> wrote:

> Hi, bird user
> It seems that the image attachment cannot be seen by others, so I resend it (
> I want to export 2602:feda:ab4::/48. I wrote 「if bgp_export() then accept」 in the BGP template, but it was not exported to BGP correctly. But bgp_export() outputs 2602:feda:ab4::/48.
> I can't find the BGP in the bird document under what circumstances will not export prefix, please tell me, thanks!
>
> bird> show route export Hurricane_Electric_LLC
> Table master6:
> 2a10:cc44:100::/44 unicast [UNM_Exch_RS2 2021-08-13 from 2602:ffb1:200:0:192:34:27:253] * (100) [AS38281i]
> via 2602:ffb1:200:0:192:34:27:6 on ens19
> 2a10:cc44:109::/48 unicast [LL_IX 15:22:24.526] * (100) [AS38281i]
> via 2602:feda:ab2:5247:5247:5247:5247:5247 on ll_ix
> 2001:df6:9f80::/48 unicast [EVIX_RS1 2021-08-13 from 2602:fed2:fff:ffff::1] * (100) [AS38281i]
> via 2602:fed2:fff:ffff::107 on ens20
> 2602:feda:ab2::/48 unicast [LL_IX 2021-08-15] * (100) [AS141011i]
> via 2602:feda:ab2:5247:5247:5247:5247:5247 on ll_ix
> bird>
>
> bird> show route where bgp_export() all
> Table master6:
> 2602:feda:ab2::/48 unicast [LL_IX 2021-08-15] * (100) [AS141011i]
> via 2602:feda:ab2:5247:5247:5247:5247:5247 on ll_ix
> Type: BGP univ
> BGP.origin: IGP
> BGP.as_path: 141011
> BGP.next_hop: 2602:feda:ab2:5247:5247:5247:5247:5247 fe80::200:5efe:5bd:ff6b
> BGP.local_pref: 100
> 2602:feda:ab4::/48 unreachable [BGP_Prefix 2021-08-13] (200)
> Type: static univ
> bird>
>
> template bgp tpl_bgp {
> graceful restart on;
> local as LOCAL_ASN;
> ipv6 {
> next hop self;
> import filter peer_in_v6;
> #export where bgp_export();
> export filter{
> #if my_opt_prefix() then bgp_path.prepend(LOCAL_ASN);
> if bgp_export() then accept;
> if bgp_export_downstream() then accept;
> else reject;
> };
> };
> }
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