[c-nsp] 3/11 (invalid or corrupt AS path)

[Rodney Dunn]

I've got a few questions I'm still trying to answer in my head
on this one.

a) Why it got down the udpate path so far if the default maxas limit is 75?

b) Were the notifications to tear the sessions down only on really old IOS
   code that doesn't have the changes to just mark them invalid.


Does anyone have the 'sh ip bgp nei <x.x.x.>' output from a router
that ***SENT*** a notification on receiving the update?

If so, what was the upstream code version that propagated the update
to you.

Rodney



On Mon, Feb 16, 2009 at 07:07:01PM +0100, Tomas Caslavsky wrote:
> Hello,
> 
> I have spoken with AS29113 admin and they will fix( block or what  ) 
> issue with their customer AS47868
> 
> Regards
> 
> Tomas
> 
> 
> Jay Nakamura wrote:
> >(Forgot to CC c-nsp)
> >
> >Someone is advertising a block with insane long prepend.  We added it to 
> >our
> >filter list and it seems most providers have filtered out that route by 
> >now.
> >
> >Our 28xx decided to flip out with IBGP.  IOS 12.4(21).  Is this a bug?  Is
> >there a bugID on this or a workaround to filter insane route?  Can I filter
> >prefix by how big it is?
> >
> >It's this route.
> >
> >#sh ip bgp 94.125.216.0
> >BGP routing table entry for 94.125.216.0/21, version 92436
> >Paths: (2 available, best #1, table Default-IP-Routing-Table)
> >Flag: 0x820
> >  Not advertised to any peer
> >
> >    x.x.x.x from y.y.y.y (z.z.z.z)
> >      Origin IGP, metric 10, localpref 100, valid, external, best
> >      Community: 13697912 13697913
> >  209 1299 29113 47868 47868 47868 47868 47868 47868 47868 47868 47868 
> >  47868
> >47868 47868 47868 47868 47868 47868 47868 47868 47868 47868 47868 47868
> >47868 47868 47868 47868 47868 47868 47868 47868 47868 47868 47868 47868
> >47868 47868 47868 47868 47868 47868 47868 47868 47868 47868 47868 47868
> >47868 47868 47868 47868 47868 47868 47868 47868 47868 47868 47868 47868
> >47868 47868 47868 47868 47868 47868 47868 47868 47868 47868 47868 47868
> >47868 47868 47868 47868 47868 47868 47868 47868 47868 47868 47868 47868
> >47868 47868 47868 47868 47868 47868 47868 47868 47868 47868 47868 47868
> >47868 47868 47868 47868 47868 47868 47868 47868 47868 47868 47868 47868
> >47868 47868 47868 47868 47868 47868 47868 47868 47868 47868 47868 47868
> >47868 47868 47868 47868 47868 47868 47868 47868 47868 47868 47868 47868
> >47868 47868 47868 47868 47868 47868 47868 47868 47868 47868 47868 47868
> >47868 47868 47868 47868 47868 47868 47868 47868 47868 47868 47868 47868
> >47868 47868 47868 47868 47868 47868 47868 47868 47868 47868 47868 47868
> >47868 47868 47868 47868 47868 47868 47868 47868 47868 47868 47868 47868
> >47868 47868 47868 47868 47868 47868 47868 47868 47868 47868 47868 47868
> >47868 47868 47868 47868 47868 47868 47868 47868 47868 47868 47868 47868
> >47868 47868 47868 47868 47868 47868 47868 47868 47868 47868 47868 47868
> >47868 47868 47868 47868 47868 47868 47868 47868 47868 47868 47868 47868
> >47868 47868 47868 47868 47868 47868 47868 47868 47868 47868 47868 47868
> >47868 47868 47868 47868 47868 47868 47868 47868 47868 47868 4
> >
> >On Mon, Feb 16, 2009 at 11:55 AM, Ozar <vegasnetman at gmail.com> wrote:
> >
> >  
> >>I am starting to see random BGP neighbor messages from multiple neighbors
> >>on
> >>different boxes.
> >>
> >>%BGP-3-NOTIFICATION: received from neighbor X.X.X.X 3/11 (invalid or
> >>corrupt
> >>AS path) 516 bytes
> >>
> >>I dont see much documentation on this, and we are in the process of 
> >>opening
> >>a TAC case, just curious if anyone else has seen these and may be able to
> >>shed some light.
> >>
> >>
> >>Thanks
> >>_______________________________________________
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> >>
> >>    
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> >  
> 
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