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

[Wojciech Wrona]

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 ? :)

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>
>
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