RE: How redistribute routes from kernel table to OSPF protocol?

22 Feb 2012

      Problem solved. I find it

Kernel protocol with learn may generate these routes, but there is an
exception for device routes in sysdep/linux/netlink/netlink.c:848 :

          /*
           * In Linux IPv6, 'native' device routes have proto
           * RTPROT_BOOT and not RTPROT_KERNEL (which they have in
           * IPv4 and which is expected). We cannot distinguish
           * 'native' and user defined device routes, so we ignore all
           * such device routes and for consistency, we have the same
           * behavior in IPv4. Anyway, users should use RTPROT_STATIC
           * for their 'alien' routes.
           */

	if (i->rtm_protocol == RTPROT_BOOT)
		src = KRT_SRC_KERNEL;

If you remove these two lines and recompile BIRD, you could probably be able
to import device routes.

Vladislav Grishin

After I restart bird

proxmox-host1:/var/log# tail /var/log/debug
Feb 22 14:59:09 proxmox-host1 bird: kernel1: Pruning inherited routes
Feb 22 14:59:11 proxmox-host1 bird: device1: Scanning interfaces
Feb 22 14:59:11 proxmox-host1 bird: kernel1: Scanning routing table
Feb 22 14:59:11 proxmox-host1 bird: kernel1: 10.18.1.25/32: ignored  <------
Feb 22 14:59:11 proxmox-host1 bird: kernel1: 10.18.1.26/32: ignored  <------
Feb 22 14:59:11 proxmox-host1 bird: kernel1: 0.0.0.0/0: [alien] seen
Feb 22 14:59:11 proxmox-host1 bird: kernel1: Pruning table master
Feb 22 14:59:11 proxmox-host1 bird: kernel1: 10.16.1.0/24: reinstalling
Feb 22 14:59:11 proxmox-host1 bird: kernel1: 10.17.1.0/24: reinstalling
Feb 22 14:59:11 proxmox-host1 bird: kernel1: Pruning inherited routes
proxmox-host1:/var/log#

Vladislav Grishin

-----Original Message-----
From: owner-bird-users@atrey.karlin.mff.cuni.cz
[mailto:owner-bird-users@atrey.karlin.mff.cuni.cz] On Behalf Of Владислав
Гришин
Sent: Wednesday, February 22, 2012 1:23 PM
To: bird-users@trubka.network.cz
Subject: How redistribute routes from kernel table to OSPF protocol?

1. Routes into kernel routing table

proxmox-host1:/# ip ro list
10.18.1.25 dev venet0  scope link
10.18.1.26 dev venet0  scope link
10.16.1.0/24 dev vmbr0  proto kernel  scope link  src 10.16.1.27
10.17.1.0/24 dev eth1  proto kernel  scope link  src 10.17.1.27
default via 10.16.1.1 dev vmbr0
proxmox-host1:/#

2. Bird Config file 

filter export_OSPF {
# redistribute connected
    if ( source = RTS_DEVICE ) then {
        print "net accepted:", net;
        ospf_metric2 = 20;
        accept;
    }
# redistribute static
    if ( source = RTS_STATIC_DEVICE ) then {
        print "net accepted:", net;
        ospf_metric2 = 20;
        accept;
    }

    if ( source = RTS_STATIC ) then {
        print "net accepted:", net;
        ospf_metric2 = 20;
        accept;
    }

    reject;
}

filter import_OSPF {
    if ( source = RTS_OSPF_EXT2 && net != 0.0.0.0/0 ) then {
        print "net accepted:", net;
        accept;
    }
    reject;
}

protocol direct {
        interface "eth1";
        interface "venet0";
}

protocol kernel {
#       table main;
        learn;                  # Learn all alien routes from the kernel
        device routes;
#       persist off;            # Don't remove routes on bird shutdown
#       scan time 20;           # Scan kernel routing table every 20 seconds
        scan time 2;            # Scan kernel routing table every 60 seconds
        import all;             # Default is import all
        export all;             # Default is export none
#       kernel table 5;         # Kernel table to synchronize with (default:
main)
}
protocol ospf myospf {
        router id 10.17.1.27;
        debug all;
        export filter export_OSPF;
        import filter import_OSPF;
        area 0.0.0.0 {
                interface "eth1" {
                        hello 10;
                        retransmit 5;
                        cost 10;
                        transmit delay 1;
                        dead count 4;
                        wait 40;
                        type broadcast;
                        priority 0;
                        authentication cryptographic;
                        password "ХХХХХХХХХХ";
                };
        };
}

3. Output bird console

bird> show route all
0.0.0.0/0          via 10.16.1.1 on vmbr0 [kernel1 2012-02-22 12:47:54] *
(10)
        Type: inherit unicast univ
10.16.1.0/24       via 10.17.1.28 on eth1 [myospf 2012-02-22 12:48:04] * E2
(150/10/20) [10.17.1.28]
        Type: OSPF-boundary unicast univ
        OSPF.metric1: 10
        OSPF.metric2: 20
        OSPF.tag: 0x00000000
        OSPF.router_id: 10.17.1.28
10.17.1.0/24       dev eth1 [direct1 2012-02-22 12:47:54] * (240)
        Type: device unicast univ
bird>

But I don't see these routes in a bird

10.18.1.25 dev venet0  scope link
10.18.1.26 dev venet0  scope link

(Only default route present from kernel.)

It is necessary to declare these routes to OSPF neighbors.

Vladislav Grishin

RE: How redistribute routes from kernel table to OSPF protocol?

Владислав Гришин