[c-nsp] Cat 6500 and counters

[Andrey Zimin]

Sorry, aging limit - 30-40 _K_ flow/s, of course.

WBR,
=============================
Andrey Zimin | AVZ-RIPE
MTU-Intel ISP, Moscow, Russia
=============================
 

> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net 
> [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Andrey Zimin
> Sent: Thursday, April 28, 2005 1:54 PM
> To: cisco-nsp at puck.nether.net
> Subject: RE: [c-nsp] Cat 6500 and counters
> 
> > > On Wed, Apr 27, 2005 at 02:41:36PM -0700, Kevin Graham wrote:
> > > [..]
> > > > > What about netflow?  Does it work on the Sup2/MSFC2 
> > and/or the Sup720?
> > > > > I saw one post claiming "v5 only", so IPv6 netflow 
> isn't there?
> > > > 
> > > > Doubt v9 exports are there yet, but your biggest caveat 
> > will be that
> > > > you'll have to do sampled netflow to avoid killing the 
> > Sup cpu. This
> > > > is my single biggest gripe w/ the platform.
> > > 
> > > Can someone else confirm this, that "unsampled netflow" will be a 
> > > CPU problem?
> > 
> > No, netflow does not have any impact on CPU at all - netflow 
> > statistics 
> > collected at "hardware" level.
> > 
> > > For billing, we won't need netflow on most of the ports, 
> > but for some
> > > parts of the network, we can't do without (yet), and 
> > sampled netflow is
> > > BAD for that (if just because there have been some cases in 
> > court recently
> > > where the court said "this is not science, this is just 
> > guesswork, it
> > > cannot be accepted as a serious base for billing").
> > 
> > Please note that c65 limited on number of active of netflow 
> entries. 
> > For sup720-3bxl/sup720-3b this number is relatively high one 
> > (~230K entries), 
> > but this limit exists... 
> In real life you more hit aging limit(30-40 flow/s) and with this:
> 
> > PS: one more limitation - you will not be able to limit router to 
> > collect netflow data on just some interfaces - it will collect 
> > data on all interfaces. 
> You can't collect full NF data more than 1-2Gbit/s Internet 
> traffic crossing
> Sup720-3bxl box, and more 5Gbit/s with src-dst-if aggregations.
> It depends of enviroment, but realy far from expected on 
> router with 10GE interfaces.
> 
> So, pay you exclusive attention on NF functions on 6K 
> platform, if u have plan to use it.
> It totally different than u can see on other router platforms.
> 
> Do the tests in real enviroments, if that possible.
> 
> Just my 2c.
> 
> WBR,
> =============================
> Andrey Zimin | AVZ-RIPE
> MTU-Intel ISP, Moscow, Russia
> =============================
> 
> _______________________________________________
> cisco-nsp mailing list  cisco-nsp at puck.nether.net
> https://puck.nether.net/mailman/listinfo/cisco-nsp
> archive at http://puck.nether.net/pipermail/cisco-nsp/