Problem to receive an announcement in BIRD.

[Marcio]

Yes, i have. This is a problem? BGP don't avoid loops automatically finding
it own ASN in AS PATH?

Em dom, 2 de set de 2018 03:27, Maria Jan Matějka <jan.matejka at nic.cz>
escreveu:

>
>
> Now there is one route originated from R.
>
> >> > 2018-09-01 21:21:08.000 <TRACE> SDNRTR: Got UPDATE
> >> > 2018-09-01 21:21:08.000 <TRACE> SDNRTR > added [best] 10.3.1.0/24
> >> > unicast
> >> > 2018-09-01 21:21:08.000 <TRACE> kernel1 < replaced 10.3.1.0/24
> >unicast
> >> > 2018-09-01 21:21:08.000 <TRACE> SDNRTR < rejected by protocol
> >> > 10.3.1.0/24
> >> > unicast
> >> > 2018-09-01 21:21:08.000 <TRACE> R8 < replaced 10.3.1.0/24 unicast
> >> > 2018-09-01 21:21:08.000 <TRACE> R8: Sending UPDATE
>
> Here S added better route and it was propagated to kernel and R. S doesn't
> send it back.
>
> >> > 2018-09-01 21:21:08.000 <TRACE> SDNRTR: Got UPDATE
> >> > 2018-09-01 21:21:08.000 <TRACE> SDNRTR > removed [replaced]
> >> > 10.3.1.0/24
> >> > unicast
> >> > 2018-09-01 21:21:08.000 <TRACE> kernel1 < replaced 10.3.1.0/24
> >unicast
> >> > 2018-09-01 21:21:08.000 <TRACE> SDNRTR < added 10.3.1.0/24 unicast
> >> > 2018-09-01 21:21:08.000 <TRACE> R8 < rejected by protocol
> >10.3.1.0/24
> >> > unicast
> >> > 2018-09-01 21:21:08.000 <TRACE> R8 < removed 10.3.1.0/24 unicast
> >> > 2018-09-01 21:21:08.000 <TRACE> SDNRTR: Sending UPDATE
> >> > 2018-09-01 21:21:08.000 <TRACE> R8: Sending UPDATE
>
> Here S sent another route (replacing its previous one) which came out
> worse even than the previous from R. So the R's route is announced to S and
> withdraw to R.
>
> >> > 2018-09-01 21:21:08.001 <TRACE> R8: Got UPDATE
> >> > 2018-09-01 21:21:08.001 <TRACE> R8 > removed [sole] 10.3.1.0/24
> >> > unicast
> >> > 2018-09-01 21:21:08.001 <TRACE> kernel1 < removed 10.3.1.0/24
> >unicast
> >> > 2018-09-01 21:21:08.001 <TRACE> SDNRTR < removed 10.3.1.0/24
> >unicast
> >> > 2018-09-01 21:21:08.001 <TRACE> SDNRTR: Sending UPDATE
>
> R8 withdraws its route.
>
> >> > 2018-09-01 21:21:08.001 <TRACE> R8: Got UPDATE
> >> > 2018-09-01 21:21:08.001 <TRACE> R8 > added [best] 10.3.1.0/24
> >unicast
> >> > 2018-09-01 21:21:08.001 <TRACE> kernel1 < added 10.3.1.0/24 unicast
> >> > 2018-09-01 21:21:08.001 <TRACE> SDNRTR < added 10.3.1.0/24 unicast
> >> > 2018-09-01 21:21:08.001 <TRACE> R8 < rejected by protocol
> >10.3.1.0/24
>
> R8 sends a route and BIRD sends update to S.
>
> Everything in the log is OK, just the peers (R and S) are doing quite
> strange things. Don't you have loops in your routing?
>
> Maria
>
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