Route redistribution between OSPF instances

4 Mar 2019

      Hello, I need some help in understanding bird. Route redistribution between
ospf instances doesn't work for me.
I tried everything I could think of short of debugging source code, and
narrowed it down to route type.
If it's RTS_OSPF_IA, ospf_metric2 is set to LSINFINITY.
How I wanted to use it:
VM announces some /32 net in area 20.
This net is received by vm's host into table_ospf_0 and redistributed to:
1) backbone area so other vm hosts can reach it
2) table_allroutes via a pipe.
Ospf_allroutes protocol takes it from table_allroutes and announces it to
everyone in area 30.

Am I doing something stupid? Should it even work?

Minimal config example:

ipv4 table table_ospf_0; # contains host-host vm /32 ip announces
ipv4 table table_allroutes; # contains all routes learned.

protocol pipe pipe_ospf_0_allroutes {
        table table_ospf_0;
        peer table table_allroutes;
        import none ;
        export filter { if (net.len = 32) then accept; else reject; } ;
}

protocol ospf ospf_vm {
        ipv4 {
                table table_ospf_0;
                export all;
                import filter filter_from_ospf;
        };
        # meant for host-host vm /32 ip announces
        # without it, best route to other host's vm will be via PE
        area 0.0.0.0 {
                interface "ospf0-br" {
                        authentication cryptographic;
                        password "pass1";
                };
        };
        # meant for ip announces.
        area 0.0.0.20 {
                interface "ospf20-br" {
                        authentication cryptographic;
                        password "pass2";
                };
        };
}

protocol ospf ospf_allroutes {
        ipv4 {
                table table_allroutes;
                import keep filtered on;
                export all;
                import filter filter_to_kernel;
        };
        # Meant for vm's that want to accept ALL routes with per-vrf ospf
tag
        area 0.0.0.30 {
                interface "ospf30-br" {
                        authentication cryptographic;
                        password "pass3";
                };
        };
}

How route is seen:
Imported from other vm host via ospf:
bird> show route table table_ospf_0 10.20.5.135/32 all
Table table_ospf_0:
10.20.5.135/32       unicast [ospf_vm 13:52:53.209] IA (150/20)
[10.255.10.129]
        via 10.133.146.12 on ospf0-br
        Type: OSPF-IA univ

Piped to table_allroutes: (as expected, nothing changed)
bird> show route table table_allroutes 10.20.5.135/32 all
Table table_allroutes:
10.20.5.135/32       unicast [ospf_vm 13:52:53.209] IA (150/20)
[10.255.10.129]
        via 10.133.146.12 on ospf0-br
        Type: OSPF-IA univ

In ospf_vm:
# birdc show ospf state ospf_vm 
area 0.0.0.0
    router 10.255.10.129
                distance 10
...
                xnetwork 10.20.5.135/32 metric 10
...
                xrouter 10.20.5.135 metric 10

area 0.0.0.20
        router 10.255.10.128
                distance 0
                xnetwork 10.20.5.135/32 metric 20
...
                xrouter 10.20.5.135 metric 20

# birdc show ospf state ospf_allroutes 
area 0.0.0.30
        router 10.255.10.128
                distance 0
                external 10.20.5.135/32 metric2 16777215

Route redistribution between OSPF instances

Yaroslav Dronskii