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

[Rodney Dunn]

I hate this more than you do but we couldn't fix
this due to backwards compatability issues.

You can't change it until after dCEF is enabled
because we use the IPC communication to send
the commands to the VIP.

I always tell customers to do it this way to be
safe when making the transition from CEF to dCEF
on a 75xx.

a) Enable FIFO queueing on ALL interfaces (no fair-queue)
b) Enable dCEF (ip cef distributed)
c) To enable some form of fancy queueing either do:
   a) fair-queue under the interface to enable dWFQ
      'sh int' should show VIP-based WFQ
   b) apply a service-policy with a class-default doing
      'fair-queue'
   
   I like (b) because it gives you more flexibility down
   the road for CBWFQ if you want to do it.

Rodney


On Wed, Sep 15, 2004 at 03:52:24PM -0400, Andy Dills wrote:
> On Wed, 15 Sep 2004, Rodney Dunn wrote:
> 
> > Oh..and one thing I did just remember during lab testing.
> >
> > Make sure if these are T1's you either do:
> > fair-queue
> > or
> > no fair-queue
> >
> > so it's no doing RSP based WFQ and the packets are
> > dCEF switched.
> 
> Wow, you are the cisco master :)
> 
> Why is it that doing this pushes the WFQ to the VIP instead of the RSP?
> 
> Since WFQ is the default queueing on T1s, you have to wonder why that's,
> by default, handled on the RSP. I'll go enable this on all the T1
> interfaces.
> 
> Thanks, the show interface <int> stat is helpful for determining whether
> or not packets are being dCEFed or not.
> 
> Thanks again!
> Andy
> 
> ---
> Andy Dills
> Xecunet, Inc.
> www.xecu.net
> 301-682-9972
> ---