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Hello,<br>
<br>
We use bird 1.4.2 as route server with multiple RIBs with ~100 BGP
active sessions.<br>
Over one of these sessions, we're receiving ~ 360k prefixes and
re-announcing them to all other sessions.<br>
<br>
By my calculations the total amount of all prefixes in all RIBs is
about ~ 3600000 and till now everything was OK.<br>
<br>
<b>But today we have experienced the following issue: </b><br>
<br>
When we stopped the session that we received ~360k, BIRD daemon went
to 100% usage and held this behavior for <br>
period of~5-6 min. This event caused а lot of ( but not all )
sessions to start flapping. <br>
<br>
Here is the output taken from our log during the event:<br>
<div class="moz-signature"><br>
Sep 18 10:40:51 rs2 bird: R0_69: Received: Hold timer expired<br>
Sep 18 10:40:51 rs2 bird: R0_69: BGP session closed<br>
Sep 18 10:40:52 rs2 bird: R0_69: Down<br>
Sep 18 10:41:11 rs2 bird: R0_69: Startup delayed by 60 seconds<br>
Sep 18 10:41:45 rs2 bird: R0_69: Incoming connection from
10.0.0.69 (port 13073) rejected<br>
Sep 18 10:41:59 rs2 bird: R0_69: Started<br>
Sep 18 10:42:36 rs2 bird: R0_69: Incoming connection from
10.0.0.69 (port 24222) accepted<br>
Sep 18 10:42:36 rs2 bird: R0_69: BGP session established<br>
<br>
The above lines was repeated for all other affected sessions.<br>
<br>
After the CPU peak of 5 min, all affected sessions became UP
again.<br>
<br>
Our CPU arch is 2 x Intel(R) Xeon(R) CPU E5310 1.6Ghz with 4
cores. <br>
<br>
I know BIRD that still may use only 1 CPU core but is there any
plans to use more?<br>
<br>
We will highly appreciate for any suggestions or share some
experience how to prevent in future such event.<br>
<br>
Thanks in advance!<br>
<br>
Best~<br>
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<strong>Javor Kliachev</strong><br>
IP Engineer<br>
<br>
Neterra Ltd.<br>
Telephone: +359 2 975 16 16<br>
Fax: +359 2 975 34 36<br>
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