Direct protocol affects BGP

[Fabiano D'Agostino]

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 <green at 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.lalioti at 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 <
> bena at 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
>
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