Problem to receive an announcement in BIRD.

[Marcio]

 Dear,

I have a topology with many ASes using BIRD except one. This AS(called
SDNRTR) is using a SDN technology and it is programmed to announce some
prefixes. When it announces, some of it neighbors(BIRD ASes) are rejecting
the announcement. Follow the line in BIRD logs.

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
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
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
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
unicast

It is showing "rejected by protocol". Do you know what it means? How could
i solve this trouble?
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