[c-nsp] Redirects / hair-pinning traffic vs. performance

[Rodney Dunn]

I agree then. There probably is a platform level command that would
show the hw switched traffic I just don't know what it is for that
platform.

Rodney

On Tue, Jun 23, 2009 at 11:53:51PM +0200, Peter Rathlev wrote:
> On Tue, 2009-06-23 at 11:11 -0400, Rodney Dunn wrote:
> > On Sun, Jun 21, 2009 at 11:05:55PM +0200, Peter Rathlev wrote:
> > > Interface stats for the two relevant interfaces (policy map attached to
> > > Vlan2176, policy routed traffic exits via Vlan507, non policy routed
> > > exist via next hop on same interface as it arrived):
> > > 
> > > Vlan507
> > >           Switching path    Pkts In   Chars In   Pkts Out  Chars Out
> > >                Processor      73750    4426830     314407   20751714
> > >              Route cache          1         90          0          0
> > >                    Total      73751    4426920     314407   20751714
> > > Vlan2176
> > >           Switching path    Pkts In   Chars In   Pkts Out  Chars Out
> > >                Processor     210884   13340863     323420   21776624
> > >              Route cache         23       5081         24       5267
> > >                    Total     210907   13345944     323444   21781891
> > 
> > I thought the newew sup/rp's would show a distributed cache line that
> > would show the hw forwarded counters.
> 
> Well, this is a 3560 IP Services which was chosen as a relatively
> inexpensive device capable of doing PBR "in hardware". So no distributed
> cache for us.
> 
> > > The "show ip traffic" seems only to show traffic received. Should it
> > > also show policy routed traffic?
> > 
> > No. I was looking to see if there were a bunch of ICMP generated frames.
> 
> Ah, ok.
> 
> I've looked more at the load of the unit as we throw more traffic at it.
> It might actually be that the peaks we see are only ARP and other
> traffic destined for the processor. Since it's placed on directly on teh
> intar-tubes it does receive it's fair share.
> 
> I'll monitor it closely, but it actually seems to do the job very well.
> Compared to a NPE-225 doing basically the same job in another but
> comparable place it looks positively relaxed. :-)
> 
> Regards,
> Peter
>