Malformed AS_PATH error

[Ondrej Filip]

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On 6.11.2014 15:48, Jiřík Tomáš wrote:
> Hi,
> 
> I am seeing this error message in bird's log and I am unable to
> find reason.
> 
> 
> 
> <RMT> PEER: Error: Malformed AS_PATH:
> 40022002080000b8800000b8800000b8
> 
> 
> 
> Weird thing is that if my peer sends me just his prefixes
> everything is alright. When he sends me full IP table and I apply
> filter to accept just my peer prefixes, the error occurs again.
> 
> 
> 
> I have theory, that when BIRD reads route with a  malformed path
> even if he does not  accept it, it drops BGP connection with this
> error.

Yes, that's right. Some of the prefixes has malformed BGP attribute
AS-PATH. This behaviour is partially discussed in programmer's
documentation.

> So I have 2 questions. Am I correct in my theory? And if so is
> there way around it?

We the AS path really seems to be odd. You can run debug to see
which prefix is causing this issue.

			Ondrej


> 
> 
> 
> best regards,
> 
> 
> 
> Tomas Jirik
> 

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