Long AS Path

Olivier Benghozi olivier.benghozi at wifirst.fr
Tue Jun 20 23:33:07 CST 2017


Yes, we had this kind of stuff in our logs:

Jun 20 08:15:25  cr-co-01-pareq2-re0 rpd[9656]: %DAEMON-3: Prefix Send failed ! x:x:186.177.176.0/23 (label 19) bgp_rt_trace_too_big_message:1213 path attribute too big. Cannot build update.

The AS path we have here is currently 12956 262206 262206 262197...

> On 21 june 2017 at 01:12, James Braunegg <james.braunegg at micron21.com> wrote :
> 
> Just wondering if anyone else saw this yesterday afternoon ?
> 
> Jun 20 16:57:29:E:BGP: From Peer 38.X.X.X received Long AS_PATH= AS_SEQ(2) 174 12956 23456 23456 23456 23456 23456 23456 23456 23456 23456 23456 23456 23456 23456 23456 23456 23456 23456 23456 23456 23456 23456 23456 23456 23456 23456 23456 23456 23456 ... attribute length (567) More than configured MAXAS-LIMIT
> 
> Someone is having fun, creating weird and wonderful long AS paths based around AS 23456, we saw the same pattern of data from numerous upstream providers.


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