FreeBSD, OSPF & bird 1.6.0

12 Jul 2017

      Hello!

Have 2 FreeBSD hosts directly connected via VLAN.
Host 1 ip: x.x.12.203
Host 2 ip: x.x.12.204

Host 1 is FreeBSD 10.3-p12, running bird 1.6.0
Host 2 is FreeBSD 11-Stable, running bird 1.6.3

The problem is that Host1 can't resolve ARP of Host2 because of this kernel
route:
X.X.12.204       31.44.12.204       UGH1   lagg0.150

This route is installed by bird. When I filter this route in updates - I
see no problems in ARP. But where it is coming from? Imho from (show ospf
state)
      router 0.0.1.2
                distance 10
                network X.X.12.200/29 metric 10
                stubnet 172.31.1.2/32 metric 0
...
external X.X.12.200/29 metric2 20
               external X.X.12.204/32 metric2 20
external 172.31.1.2/32 metric2 20

Configs are pretty simple and shown below. So my question is - Is this
normal or something wrong with my config?

common part of configs:
protocol device main_device {
        scan time 60;
}

protocol direct main_direct {
        interface "*";
        check link yes;
}

#
#
#

filter f_main_kernel_import
{
    accept;
}

filter f_main_kernel_export
{
    if(source = RTS_STATIC || source = RTS_STATIC_DEVICE) then
        accept;
    else if(source = RTS_INHERIT) then
        accept;
    else if(source = RTS_OSPF || source = RTS_OSPF_IA || source =
RTS_OSPF_EXT1 || source = RTS_OSPF_EXT2) then
        accept;
    else if(source = RTS_BGP) then {
        if(bgp_path.len < 2) then
            accept;
        else {
            if(defined(bgp_community) && (bgp_community ~ [(BGP_MC_LOCAL)]
|| bgp_community ~ [(BGP_MC_LOCAL_INTERNET)] || bgp_community ~
[(BGP_MC_CUSTOMER)])) then accept;
            else if(defined(bgp_ext_community) && (bgp_ext_community ~
[(BGP_EMC_LOCAL)] || bgp_ext_community ~ [(BGP_EMC_LOCAL_INTERNET)] ||
bgp_ext_community ~ [(BGP_EMC_CUSTOMER)])) then accept;
            else if(defined(bgp_community) && bgp_community ~
[(BGP_MC_UPSTREAM)] && fn_ipv4_default()) then accept;
            else reject;
        }
    } else
        reject "[f_main_kernel_export] reject: ", net, "/", from, "/",
source;
}

#
filter f_main_ospf_import
{
    if(fn_ipv4_announced()) then {
        bgp_community.add(BGP_MC_LOCAL_INTERNET);
        bgp_ext_community.add(BGP_EMC_LOCAL_INTERNET);
    }
    else {
        bgp_community.add(BGP_MC_LOCAL);
        bgp_ext_community.add(BGP_EMC_LOCAL);
    }

    bgp_local_pref = BGP_LP_LOCAL;

    if(net = 31.44.12.204/32) then
        reject;

    accept;
}

filter f_main_ospf_export
{
    case source {
        RTS_INHERIT:
            ospf_metric2 = 20;
            accept;
        RTS_DEVICE:
            ospf_metric2 = 20;
            accept;
        RTS_STATIC_DEVICE:
            if(fn_ipv4_default()) then ospf_metric2 = 100;
            else ospf_metric2 = 20;
            accept;
        RTS_STATIC:
            ospf_metric2 = 20;
            accept;
        RTS_BGP:
            if(fn_ipv4_default()) then {
                ospf_metric2 = 100;
                accept;
            }
            else
                reject;
        RTS_OSPF:
            accept;
        RTS_OSPF_IA:
            accept;
        RTS_OSPF_EXT1:
            accept;
        RTS_OSPF_EXT2:
            accept;
        else:
            reject "[f_main_ospf_export] reject: ", net, "/", from, "/",
source;
    }
}

Host1 OSPF:
root@br0:/usr/local/etc/bird# more ipv4_ospf.conf
#
protocol ospf main_ospf {
        rfc1583compat   yes;
        tick            2;
        router id       0.0.1.1;

        export filter   f_main_ospf_export;
        import filter   f_main_ospf_import;

        area    0.0.0.0 {

                networks {
                    172.31.1.1/32;
                    X.X.12.200/29;
                };

                interface "lo*" {
                        cost            10;
                        hello           15;
                        dead            60;
                        type            ptp;
                };

                interface "lagg0.150" {
                        cost            10;
                        hello           2;
                        dead            10;
                };

        };
}

Host2 OSPF:
root@br0:/usr/local/etc/bird# more ipv4_ospf.conf
#
protocol ospf main_ospf {
        rfc1583compat   yes;
        tick            2;
        router id       0.0.1.2;

        export filter   f_main_ospf_export;
        import filter   f_main_ospf_import;

        area    0.0.0.0 {

                networks {
                    172.31.1.2/32;
                    X.X.12.200/29;
                };

                interface "lo*" {
                        cost            10;
                        hello           15;
                        dead            60;
                        type            ptp;
                };

                interface "lagg0.150" {
                        cost            10;
                        hello           2;
                        dead            10;
                };

        };
}

Regards,
Boris

-- 

С уважением,
Борис Коваленко