[f-nsp] NI40G interfaces blocking

[Henk.Roose at cwi.nl]

Charley Kline wrote:

> Line card problems on the 40G are nightmares to diagnose. We had a  
> similar problem on a couple of ours that they worked on for months,  
> complete with special instrumentation on the LP's and an engineer on- 
> site. They finally isolated it to too much broadcast traffic (ARPs,  
> due to a network loop somewhere) overwhelming the LP, which then  
> stopped responding.
> 
> Things seem much better at 2.3.0d, for what it's worth. We also  

They (foundry) suggested an upgrade to 2.3.0d, which I did last
monday.

I'd like to add that the problem seems packet processor specific.
The same lock-up behaviour occured on a 40x1G port line card. That
card has 4 PPCR's and the 10 ports associated with PPCR 1 where dead.
All others were still forwarding traffic.

> configured "arp-port-rate-limit 200" per their recommendation to  
> protect the LP from too much broadcast traffic.
> 
> /cvk
> 
> 
> 
> On Jun 27, 2007, at 6:53a, Henk.Roose at cwi.nl wrote:
> 
> > Hello *,
> >
> > I have an NI40G that keeps locking up interfaces at random (could be
> > conce a week, every two weeks or once a month or so). It's  
> > multihomed BGP
> > connected 10 Gig (primary) and 1 Gig (backup) to two Avici's  
> > upstream. I'm
> > getting full feeds over both interfaces. Now, what happens is that one
> > of the line cards seems to stop forwarding traffic which causes the  
> > BGP
> > sessions to die and I end up with my peerings in Connect state forever
> > (until I power off/on or reload). I haven't got the slightest idea  
> > what
> > the cause might be.  Anyone experienced this before? I have a call  
> > open
> > at Foundry's but they haven't come up with anything so far.
> >
> > I'm running 2.3.0a btw.
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Henk

-- 
Henk Roose
CWI - Centrum voor Wiskunde en Informatica
Centre for Mathematics and Computer Science
Amsterdam (NL)