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Thanks Sean.

 I believe that the os-ken driver is not coded to honor this premise
because the below function can learn new paths from peer update messages.
https://opendev.org/openstack/os-ken/src/branch/master/os_ken/services/protocols/bgp/peer.py#L1544

Em qua., 16 de nov. de 2022 às 09:14, Sean Mooney <smooney at redhat.com>
escreveu:

> On Wed, 2022-11-16 at 09:05 -0300, Roberto Bartzen Acosta wrote:
> > Sorry for the mistake, I meant, the bgpspeaker should only "*advertise*!"
> > and not "learn" the AS_PATHs via BGP.
> yes that used to be the scope of that project to advertise only and not
> learn
> so i would geuss either that has change recently and they broke backward
> compaitbly
> or they have refactord it to use an external bgp speaker like frr and it
> learns by default
>
> i dont really see anything here
> https://github.com/openstack/neutron-dynamic-routing/commits/master
> im not really familar with the internals of the project but i dont see any
> code to learn routs form
>
>
> https://github.com/openstack/neutron-dynamic-routing/blob/master/neutron_dynamic_routing/services/bgp/agent/driver/os_ken/driver.py
>
> it just has code for advertizing and withdrawing routes.
>
>
>
> >
> > Em qua., 16 de nov. de 2022 às 08:57, Sean Mooney <smooney at redhat.com>
> > escreveu:
> >
> > > On Wed, 2022-11-16 at 08:43 -0300, Roberto Bartzen Acosta wrote:
> > > > Hey folks,
> > > >
> > > > Please, I have a question here, the bgpspeaker should only "learn"
> and
> > > not
> > > > "advertise" the AS_PATHs via BGP, right?
> > >
> > > its been a while since i looked at it but in the past it did not
> supprot
> > > learning at all
> > >
> > > it just advertised the routes for the neutron netowrks
> > >
> > > >
> > > > In my tests, I can see that it is learning routes from BGP neighbors.
> > > This
> > > > behavior can cause an AS_PATH loop because the bgpspeaker learns
> back its
> > > > own advertised routes, and I see a message like this in the logs:
> > > >
> > > > 2022-11-11 19:45:41.967 7220 ERROR bgpspeaker.peer [-] AS_PATH on
> UPDATE
> > > > message has loops. Ignoring this message:
> > > >
> > >
> BGPUpdate(len=91,nlri=[],path_attributes=[BGPPathAttributeMpReachNLRI(afi=2,flags=144,length=46,next_hop='2001:db7:1::1',nlri=[IP6AddrPrefix(addr='2001:db9:1234::',length=64)],safi=1,type=14),
> > > > BGPPathAttributeOrigin(flags=64,length=1,type=1,value=0),
> > > > BGPPathAttributeAsPath(flags=80,length=10,type=2,value=[[65001,
> > > >
> > >
> 65000]])],total_path_attribute_len=68,type=2,withdrawn_routes=[],withdrawn_routes_len=0)
> > > >
> > > > This can be fixed by suppressing the neighbor route advertisement
> (using
> > > > route-map export), but have I misunderstood how
> neutron-dymanic-routing
> > > > works or do we have a possible bug here?
> > > >
> > > > Regards
> > > >
> > >
> > >
> >
>
>

-- 




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