Direct protocol affects BGP

[Benedikt Neuffer]

Hi Fabiano,

that should be the reason. The TCP connection is done via RIB (kernel
routing table). In FIB (birds internal table) the route is currently
missing.
If you enable the direct protocol a route for  192.168.2.22 will be
appear in the FIB and the nexthop resolution will work.

Is there a reason why you don't want to use the direct protocol?

Regards,
Benedikt

On 23.03.20 14:46, Fabiano D'Agostino wrote:
> Hi,
> thanks for helping, 
> I did show route for 192.168.2.22 (which is my neighbor) table all all
> --> I get Network not found.
> show protocols: bgp established
> show protocol all bgp1: 0 imported, 0 exported
> 
> 
> Il giorno lun 23 mar 2020 alle ore 14:18 Benedikt Neuffer
> <benedikt.neuffer at kit.edu <mailto:benedikt.neuffer at kit.edu>> ha scritto:
> 
>     Hi Fabio,
> 
>     so the routes are in FIB (kernel) but maybe not in RIB (bird).bb
> 
>     Can you provide me the output of "show route for <prefix> table all all"
>     where <prefix> should be the prefix configured on the connection or the
>     ip address of the neighbor.
> 
>     Regards,
>     Bene
> 
>     On 23.03.20 12:43, Fabiano D'Agostino wrote:
>     > Hi Benedikt,
>     > the nexthop is resolvable, indeed router1 can ping router2'nic in the
>     > same network of router1, with direct protocol disabled. The
>     scenario is: 
>     > PCa - R1 - R2 - PCb
>     > With direct protocol enabled and bgp working: PCa can ping PCb
>     > With direct protocol disabled and bgp working: PCa can't ping PCb
>     >
>     >
>     > Il giorno lun 23 mar 2020 alle ore 12:26 Benedikt Neuffer
>     > <benedikt.neuffer at kit.edu <mailto:benedikt.neuffer at kit.edu>
>     <mailto:benedikt.neuffer at kit.edu <mailto:benedikt.neuffer at kit.edu>>>
>     ha scritto:
>     >
>     >     Hi Fabio,
>     >
>     >     the BGP nexthop field must be resolvable. In other words there
>     must be a
>     >     route to the neighbor in RIB.
>     >
>     >     Regards,
>     >     Bene
>     >
>     >
>     >     On 23.03.20 12:05, Fabiano D'Agostino wrote:
>     >     > Hi all,
>     >     > why if I disable the direct protocol the BGP routes are not
>     >     > imported/exported? If I run show route, it is empty, while
>     if I enable
>     >     > the direct protocol show route has directly connected routes and
>     >     BGP routes.
>     >     > My configuration is very easy, two routers make a eBGP
>     peering and
>     >     they
>     >     > import and export all routes. I am using Bird 2.0.7.
>     >     >
>     >     > Thanks,
>     >     >
>     >     > Fabiano
>     >
>     >
>     >     --
>     >     Karlsruher Institut für Technologie (KIT)
>     >     Steinbuch Centre for Computing (SCC)
>     >
>     >     Benedikt Neuffer
>     >     Netze und Telekommunikation (NET)
>     >
>     >     Hermann-von-Helmholtz-Platz 1
>     >     Gebäude 442
>     >     Raum 185
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>     >     Telefon: +49 721 608-24502
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>     <mailto:benedikt.neuffer at kit.edu> <mailto:benedikt.neuffer at kit.edu
>     <mailto:benedikt.neuffer at kit.edu>>
>     >     Web: https://www.scc.kit.edu
>     >
>     >
>     >
>     >     Sitz der Körperschaft:
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>     >
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> 
> 
>     -- 
>     Karlsruher Institut für Technologie (KIT)
>     Steinbuch Centre for Computing (SCC)
> 
>     Benedikt Neuffer
>     Netze und Telekommunikation (NET)
> 
>     Hermann-von-Helmholtz-Platz 1
>     Gebäude 442
>     Raum 185
>     76344 Eggenstein-Leopoldshafen
> 
>     Telefon: +49 721 608-24502
>     Fax: +49 721 608-47763
>     E-Mail: benedikt.neuffer at kit.edu <mailto:benedikt.neuffer at kit.edu>
>     Web: https://www.scc.kit.edu
> 
> 
> 
>     Sitz der Körperschaft:
>     Kaiserstraße 12, 76131 Karlsruhe
> 
> 
> 
>     KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft
> 
> 
> 
>     Signaturversion: 19.1.0 beta
> 


-- 
Karlsruher Institut für Technologie (KIT)
Steinbuch Centre for Computing (SCC)

Benedikt Neuffer
Netze und Telekommunikation (NET)

Hermann-von-Helmholtz-Platz 1
Gebäude 442
Raum 185
76344 Eggenstein-Leopoldshafen

Telefon: +49 721 608-24502
Fax: +49 721 608-47763
E-Mail: benedikt.neuffer at kit.edu
Web: https://www.scc.kit.edu



Sitz der Körperschaft:
Kaiserstraße 12, 76131 Karlsruhe



KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft



Signaturversion: 19.1.0 beta

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