[c-nsp] cef load-sharing per-packet bizzare behavior

[Rodney Dunn]

Are you doing this on the RSP or the VIP?

Do this:


clear counters
wait 30 seconds
sh int se 5/1/0 stat
sh int se 5/1/1 stat
sh int (inbound traffic interface) stat


if-con <inbound slot>
sh ip cef <dst-prefix> int
sh ip cef <dst-prefix>



Rodney


On Wed, Sep 15, 2004 at 02:23:09PM -0400, Andy Dills wrote:
> On Wed, 15 Sep 2004, Rodney Dunn wrote:
> 
> > Does the downstream routers show the same unequal
> > load inbound?
> 
> Yes. The customer was the first to notice it. The same unequal load is
> seen from the CPE as from this end.
> 
> > Is that the only prefix being forwarded over
> > the links?
> 
> Yes, absolutely. One of the first things I checked. All of the routes are
> announced to me via BGP, and I've got dual static routes to the address I
> peer with. This has been verified 100% in the cef table. (sh ip cef | incl
> <interface>)
> 
> One more tidbit to add. When I shut one interface, the bulk of the load
> shifts to the other interface (and stays there), and vice versa.
> 
> So, for instance, if I shut s5/1/0, only s5/1/1 gets used. The moment I
> 'no shut' it, s5/1/1 has about 2/3rds of the traffic and s5/1/0 gets about
> 1/3rd of the traffic (this is measured 10 minutes after bringing back up
> the interface). If I then go and shut s5/1/1, when I 'no shut' it, the
> 2/3rds of the traffic moves to and stays on s5/1/0.
> 
> So, in essence, whichever interface has been up longer bares the bulk of
> the traffic.
> 
> Thanks for any advice,
> Andy
> 
> ---
> Andy Dills
> Xecunet, Inc.
> www.xecu.net
> 301-682-9972
> ---