BIRD 3.0.1 Ignoring GW Attribute

[Hutchinson, Peter]

It seems that BIRD 3.0.1 is ignoring the GW attribute, after upgrading from BIRD 2.16.1 to 3.0.1 all routes are showing as unreachable as shown below. The BGP peers are 3 hops away from BIRD within the same AS hence the need for the GW. Note I did not modify the BIRD configuration in between upgrading from 2.16.1 to 3.0.1.

birdc 'show route all for 1.1.1.1'

BIRD 2.16.1 ready.
Table master4:
1.1.1.0/24           unicast [wel_core30 2025-01-16 from 203.14.14.10] * (100/?) [AS13335i]
        via 203.41.0.5 on ens3
        Type: BGP univ
        BGP.origin: IGP
        BGP.as_path: 13335
        BGP.next_hop: 203.14.14.65
        BGP.local_pref: 100
        BGP.aggregator: 172.68.0.1 AS13335
        BGP.community: (1221,110) (13335,10084)
        BGP.originator_id: 203.14.14.65
        BGP.cluster_list: 203.14.14.10
                     unicast [pie_core30 2025-01-16 from 203.14.14.11] (100/?) [AS13335i]
        via 203.41.0.5 on ens3
        Type: BGP univ
        BGP.origin: IGP
        BGP.as_path: 13335
        BGP.next_hop: 203.14.14.65
        BGP.local_pref: 100
        BGP.aggregator: 172.68.0.1 AS13335
        BGP.community: (1221,110) (13335,10084)
        BGP.originator_id: 203.14.14.65
        BGP.cluster_list: 203.14.14.11


birdc 'show route all for 1.1.1.1'

BIRD 3.0.1 ready.
Table master4:
1.1.1.0/24           unreachable [wel_core30 11:21:09.045 from 203.14.14.10] * (100) [AS13335i]
        hostentry: via 203.14.14.65 table master4
        preference: 100
        igp_metric: 0
        from: 203.14.14.10
        source: BGP
        bgp_origin: IGP
        bgp_path: 13335
        bgp_next_hop: 203.14.14.65
        bgp_local_pref: 100
        bgp_aggregator: 172.68.0.1 AS13335
        bgp_community: (1221,110) (13335,10084)
        bgp_originator_id: 203.14.14.65
        bgp_cluster_list: 203.14.14.10
        Internal route handling values: 0L 11G 0S id 417853
                     unreachable [pie_core30 11:21:13.738 from 203.14.14.11] (100) [AS13335i]
        hostentry: via 203.14.14.65 table master4
        preference: 100
        igp_metric: 0
        from: 203.14.14.11
        source: BGP
        bgp_origin: IGP
        bgp_path: 13335
        bgp_next_hop: 203.14.14.65
        bgp_local_pref: 100
        bgp_aggregator: 172.68.0.1 AS13335
        bgp_community: (1221,110) (13335,10084)
        bgp_originator_id: 203.14.14.65
        bgp_cluster_list: 203.14.14.11
        Internal route handling values: 0L 9G 0S id 1516013



The BIRD configuration used is shown below.

log syslog all;

router id 203.41.0.6;

roa4 table roa_v4;
roa6 table roa_v6;

#Inbound route policy
filter rpl_in {
    gw = 203.41.0.5;
    accept;
}

#BGP IPv4 neighbor config template
template bgp CORE_PEERS {
    local as 1221;
    neighbor as 1221;
    password REDACTED;
    ipv4 {
        import filter rpl_in;
        export none;
    };

}

#BGP IPv6 neighbor config template
template bgp CORE_PEERS_V6 {
    local as 1221;
    neighbor as 1221;
    password REDACTED;
    ipv6 {
        import filter rpl_in;
        export none;
    };
}

#Import device routes for TID interface
protocol device {
    scan time 10;
    interface "ens3";
}

#Import directly connected routes for TID interface
protocol direct {
    ipv4;
    ipv6;
    interface "ens3";
}

#BGP IPv4 core peer 1
protocol bgp wel_core30 from CORE_PEERS {
    neighbor 203.14.14.10;
}

#BGP IPv4 core peer 2
protocol bgp pie_core30 from CORE_PEERS {
    neighbor 203.14.14.11;
}

#BGP IPv6 core peer 1
protocol bgp wel_core30_v6 from CORE_PEERS_V6 {
    neighbor 2001:8000::70:101;
}

#BGP IPv6 core peer 2
protocol bgp pie_core30_v6 from CORE_PEERS_V6 {
    neighbor 2001:8000::70:201;
}

#RPKI cache server 1
protocol rpki rpki_cache_1{
    roa4 { table roa_v4; };
    roa6 { table roa_v6; };
    remote REDACTED port 8323;
    transport tcp;
    refresh 300;
    expire keep 3600;
}

#RPKI cache server 2
protocol rpki rpki_cache_2{
    roa4 { table roa_v4; };
    roa6 { table roa_v6; };
    remote REDACTED port 8323;
    transport tcp;
    refresh 300;
    expire keep 3600;
}

Regards,

Peter Hutchinson
TID Core

Internet Edge & Core

Global Networks & Technology, Transport & IP

[cid:1dfbd70b-26ae-414d-aa87-8a8e859368d7]

0490338570

peter.hutchinson at team.telstra.com<mailto:peter.hutchinson at team.telstra.com>

www.telstra.com<http://www.telstra.com/>

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