[rbak-nsp] BGP Flapping after update with malformed ASPATH

[Marcin Kuczera]

On 2018-05-29 13:07, Wojciech Wrona wrote:
> Marcin Can You tell anything more? I didn't notice any problem in
> decoded aspath in update message (my post before) what did i wrong ? :)
AS Path was in fact empty, all ASes in {} brackets were taken from
confederation, but AS-Path itself was empty, and that should not be sent
from RouteServer.

Marcin

>
> Best regards,
> -- 
> Wojciech Wrona
> W dniu 29.05.2018 o 12:41, Marcin Kuczera pisze:
>>
>> Fixed.
>> The problem was located in TPIX, and had been fixed.
>> And that was not a SEOS fault. SEOS behaves correctly. Question is
>> why Juniper passed malformed update...
>>
>> Regards,
>> Marcin
>>
>> On 2018-05-29 10:58, Wojciech Wrona wrote:
>>> Hi everyone,
>>> It looks like we've managed to find another strange problem with BGP
>>> on SEOS. In the night one of our peers session started to flap with
>>> following message:
>>> May 29 10:52:01: [0001]: %BGP-6-INFO: 195.149.233.1 UP
>>> May 29 10:52:15: [0001]: %BGP-6-INFO: 195.149.233.1 DOWN -
>>> Notification sent
>>> May 29 10:52:15: [0001]: %BGP-6-INFO: 195.149.233.1 send
>>> NOTIFICATION: 3/11 (update: malformed ASPATH) with 21 byte data.
>>> mxReadMs=1555
>>>
>>> It does not look like previously mentioned attribute flag error.
>>> Does anyone had something simillar ? It is a session with route
>>> server, so i know about "no enforce first-as" option and it is
>>> turned on, it was working fine till this night with no configuration
>>> change on our side.
>>>
>>> "show bgp malform update" looks like this:
>>> May 29 10:52:15 Malformed UPDATE msg (nbr 195.149.233.1, context
>>> 0x40080001, 77 bytes, repeated 5 times, reason: Invalid msg) -
>>>  ffff ffff ffff ffff ffff ffff ffff ffff 004d 0200 0000 3240 0101
>>> 0040 0212 0104 0000 17d9 0000 183e 0000 1840 0000 1967 4003 04c3
>>> 95e9 6480 0404 0000 0000 c007 0800 0073 5fc3 95ef ff16 c395 ec
>>>
>>> SEOS version SEOS-12.1.1.11p7-Release
>>>
>>> Thanks in advance,
>>> Best regards,
>>>
>>
>> -- 
>>
>> Marcin Kuczera / Wiceprezes Zarządu / CTO
>> +48 32 440 80 71/ marcin.kuczera at leon.pl <mailto:marcin.kuczera at leon.pl>
>>
>> Leon Sp. z o.o.
>> ul. Kilińskiego 33d, 44-200 Rybnik
>> http://www.leon.pl/
>>
>> INTERNET | TELEWIZJA | TELEFON
>>
>> KRS 0000223101 Sąd Rejonowy w Gliwicach
>> Kapitał zakładowy 576.700 zł
>> NIP: 6332068698
>>
>>
>>
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-- 

Marcin Kuczera / Wiceprezes Zarządu / CTO
+48 32 440 80 71/ marcin.kuczera at leon.pl <mailto:marcin.kuczera at leon.pl>

Leon Sp. z o.o.
ul. Kilińskiego 33d, 44-200 Rybnik
http://www.leon.pl/

INTERNET | TELEWIZJA | TELEFON

KRS 0000223101 Sąd Rejonowy w Gliwicach
Kapitał zakładowy 576.700 zł
NIP: 6332068698

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