Than I see no problem. When you have direct protocol off - your router
have nothing imported to the bird's routing table and so nothing is
exported to the bgp peer. A kernel protocol does not import those
routes, from the documentation:
> Note that routes created by OS kernel itself, namely direct routes
> representing IP subnets of associated interfaces, are not imported even with
> learn enabled. You can use Direct protocol to generate these direct routes.
On Wed, Mar 25, 2020 at 5:21 PM Fabiano D'Agostino
<fabiano.dagostin...@gmail.com> wrote:
>
> Yes, I disabled direct protocol on both routers. The full bird.conf is the
> following:
> log syslog all;
> ipv4 table master4;
> ipv6 table master6;
> router1 bgp configuration:
> protocol bgp {
> ipv4 {
> import all;
> export all;
> };
> local as 1;
> neighbor 192.168.2.22 as 2;
> }
> protocol device {
> }
> protocol kernel {
> ipv4 {
> table master4;
> import all;
> export all;
> };
> }
> protocol static {
> ipv4;
> }
>
>
> Il giorno mer 25 mar 2020 alle ore 17:06 Alexander Zubkov <gr...@qrator.net>
> ha scritto:
>>
>> Do you disable direct protocol on both router1 and router2?
>> And that is definitely not the full bird config, you do not have a
>> kernel protocol for example.
>>
>> On Tue, Mar 24, 2020 at 10:50 PM Fabiano D'Agostino
>> <fabiano.dagostin...@gmail.com> wrote:
>> >
>> > There is no gateway because they are directly connected. However my
>> > network topology is the following:
>> > [pc-a - router1 ]=AS 1 ; [pc-b - router 2]=AS 2;
>> > pc-a:
>> > enp0s3
>> > address 192.168.1.11
>> > gw 192.168.1.1
>> > router1:
>> > enp0s3
>> > address 192.168.1.1
>> > enp0s8
>> > 192.168.2.2
>> >
>> > router1 bgp configuration:
>> > protocol bgp {
>> > ipv4 {
>> > import all;
>> > export all;
>> > }
>> > local as 1;
>> > neighbor 192.168.2.22 as 2
>> >
>> >
>> > Il giorno mar 24 mar 2020 alle ore 22:40 Alexander Zubkov
>> > <gr...@qrator.net> ha scritto:
>> >>
>> >> There is also no gateway in you "route" output on routes exported from
>> >> bird. Maybe you have some filters that causing it? Could you show your
>> >> config if it is not secret?
>> >>
>> >> On Tue, Mar 24, 2020 at 9:53 PM Fabiano D'Agostino
>> >> <fabiano.dagostin...@gmail.com> wrote:
>> >> >
>> >> > Yes, 'show route', is from Bird. I don't have route-reflector, but just
>> >> > two routers which have a bgp session. Anyway, yes when direct is
>> >> > disabled, the bgp session is established.
>> >> >
>> >> > Il giorno mar 24 mar 2020 alle ore 21:45 Alexander Zubkov
>> >> > <gr...@qrator.net> ha scritto:
>> >> >>
>> >> >> "show route" looks a little weird, is it from bird? There are also
>> >> >> commonly a protocol and metric shown.
>> >> >> Those are from your route-reflector? Do you have your bgp sessions up
>> >> >> when direct is disabled?
>> >> >>
>> >> >> On Tue, Mar 24, 2020 at 9:33 PM Fabiano D'Agostino
>> >> >> <fabiano.dagostin...@gmail.com> wrote:
>> >> >> >
>> >> >> > Good evening Alexander,
>> >> >> >
>> >> >> > Direct protocol enabled:
>> >> >> > 'route' command:
>> >> >> > Destination Gateway Genmask Flags Metric iface
>> >> >> > 192.168.1.0 * 255.255.255.0 U 0
>> >> >> > enp0s3
>> >> >> > 192.168.1.0 * 255.255.255.0 U 32 enp0s3
>> >> >> > 192.168.2.0 * 255.255.255.0 U 0
>> >> >> > enp0s8
>> >> >> > 192.168.2.0 * 255.255.255.0 U 32 enp0s8
>> >> >> > 192.168.4.0 * 255.255.255.0 U 32 enp0s8
>> >> >> > 'show route' command:
>> >> >> > 192.168.1.0/24 enp0s3
>> >> >> > 192.168.2.0/24 enp0s8 via 192.168.2.22 on enp0s8
>> >> >> > 192.168.4.0/24 via 192.168.2.22 on enp0s8
>> >> >> >
>> >> >> > Direct protocol disabled:
>> >> >> > 'route' command:
>> >> >> > Destination Gateway Genmask Flags Metric iface
>> >> >> > 192.168.1.0 * 255.255.255.0 U 0
>> >> >> > enp0s3
>> >> >> > 192.168.2.0 * 255.255.255.0 U 0
>> >> >> > enp0s8
>> >> >> > 'show route' command:
>> >> >> > empty
>> >> >> >
>> >> >> > Thanks,
>> >> >> >
>> >> >> > Fabiano
>> >> >> >
>> >> >> > Il giorno mar 24 mar 2020 alle ore 21:00 Alexander Zubkov
>> >> >> > <gr...@qrator.net> ha scritto:
>> >> >> >>
>> >> >> >> I think it would be easier if you showed your route tables in both
>> >> >> >> cases.
>> >> >> >>
>> >> >> >> On Tue, Mar 24, 2020 at 8:57 AM Irene Lalioti
>> >> >> >> <irene.lali...@restena.lu> wrote:
>> >> >> >> >
>> >> >> >> > Hello guys!
>> >> >> >> >
>> >> >> >> > Just because today we encountered again the same issue with
>> >> >> >> > direct, I am very curious on this:
>> >> >> >> >
>> >> >> >> > I totally agree with what you guys explained about the need of
>> >> >> >> > the direct protocol. Once we set it then reachability works and
>> >> >> >> > all is ok.
>> >> >> >> >
>> >> >> >> > Our big question is why was it working before the moment it lost
>> >> >> >> > the BGP session?? In other words: the set up :
>> >> >> >> >
>> >> >> >> > RS - BGP session with the ROUTER - and behind the Router we have
>> >> >> >> > Caches.
>> >> >> >> >
>> >> >> >> > Before the router was announcing to the RS(BIRD v2.0.7) the
>> >> >> >> > caches and that they are reachable by the router. Without any
>> >> >> >> > direct.
>> >> >> >> >
>> >> >> >> > Until one day we lose the bgp session, and we can ping the caches
>> >> >> >> > from the RS but not reachable . Once we set it as direct on the
>> >> >> >> > bird then all is fine.
>> >> >> >> >
>> >> >> >> > Question is why was it working before without direct ?? :=)
>> >> >> >> >
>> >> >> >> > Many thanks for your time!
>> >> >> >> >
>> >> >> >> > Have a great day all!
>> >> >> >> >
>> >> >> >> > Irene.
>> >> >> >> >
>> >> >> >> > On 23/03/2020 17:07, Fabiano D'Agostino wrote:
>> >> >> >> >
>> >> >> >> > Hi Bernd,
>> >> >> >> > no, the routing "from the kernel" doesn't come via 'learn yes',
>> >> >> >> > but via RIB, I mean if I do 'route' it shows the directly
>> >> >> >> > connected networks. The problem is that if I use the Direct
>> >> >> >> > protocol, the command 'route' shows me two same directly
>> >> >> >> > connected networks, one coming from RIB and the other one coming
>> >> >> >> > from Bird.
>> >> >> >> > I tried protocol bgp { direct; }, but it doesn't change.
>> >> >> >> >
>> >> >> >> > Thanks,
>> >> >> >> >
>> >> >> >> > Fabiano
>> >> >> >> >
>> >> >> >> > Il giorno lun 23 mar 2020 alle ore 16:15 Bernd Naumann
>> >> >> >> > <b...@spreadshirt.net> ha scritto:
>> >> >> >> >>
>> >> >> >> >> On 23.03.20 16:01, Fabiano D'Agostino wrote:
>> >> >> >> >> > Hi Benedikt,
>> >> >> >> >> > I am just learning Bird and I didn't want to use the Direct
>> >> >> >> >> > protocol
>> >> >> >> >> > because using it I have two same routes in the RIB for the
>> >> >> >> >> > directly
>> >> >> >> >> > connected networks, one coming from the kernel and the second
>> >> >> >> >> > one coming
>> >> >> >> >> > from the direct protocol.
>> >> >> >> >>
>> >> >> >> >>
>> >> >> >> >> Is the routing "from the kernel" coming via `learn yes;`? If you
>> >> >> >> >> have no
>> >> >> >> >> need to import "alien" routes, you can disable `learn` and just
>> >> >> >> >> use
>> >> >> >> >> `direct` and `static` protocol. /* OR if you know that your
>> >> >> >> >> neighbor is
>> >> >> >> >> directly connected to you can also set 'direct' on the `protocol
>> >> >> >> >> bgp`. */
>> >> >> >> >>
>> >> >> >> >> Bernd
>> >> >> >> >>
>> >> >> >> >>
>> >> >> >> >
>> >> >> >> > --
>> >> >> >> > Irene Lalioti
>> >> >> >> > Network Engineer
>> >> >> >> > Fondation RESTENA
>> >> >> >> > 2, avenue de l'Université
>> >> >> >> > L-4365 Esch/Alzette
>> >> >> >> >
>> >> >> >> > Tel: +352 424409 1
>> >> >> >> > Fax: +352 422473
