[c-nsp] 7500 RSP8 Throughput Ability

[Rodney Dunn]

On Thu, Dec 08, 2005 at 12:49:26PM -0500, Dan Benson wrote:
> I currently have a 7200 VXR with an NSE running between 50 and 100MB  
> throughput on a daily basis (CPU around 60% at peak).  This router is  
> acting as a aggregate router for customers using dot1q to a 6500  
> switch.  I am planning on doubling this load to around 200MB's a  
> second when I rebuild this part of my network.  This router currently  
> is running OSPF with  my edge routers and has an IBGP mesh with about  
> 14 other routers.  This router will have around 25 downstream full  
> and default only BGP Customers homed to it in addition to the IBGP mesh.
> 
> My options:
> 
> I have a large inventory of 7500 hardware.  I was thinking 7513, Dual  
> RSP8's with 256MB of RAM.  VIP 4-80's with 256MB of RAM.  I will be  
> using 4 PA-				GE's and 1 Dual DS3 Chan cards.

You can not put PA-GE's in a VIP. It's not supported and will not work.
You have to have the full height GEIP cards.

> 
> As many of you will think, the 7200XVR with an NPE GE1 will be great  
> here, but I do not have one to allocate and I like the idea of route  
> processor redundance.  The other idea would be a 7300/7600/6500 all  
> with a SUP720, but again, I would rather not go out and buy 1 $10K  
> card when I have gear sitting around and the sup720 are not all that  
> cheap on the used market these days.

Depending on the traffic distribution you could probably put a couple
cards in the box and easily get 200 MBps through it. Doing it on
one card might be pushing it. This is with no feaures and dCEF.
Or if you are not going to run features that need dCEF then you might
could run it with dCEF off and let the RSP handle it and get those rates.
I don't know the pps numbers of the RSP8 directly as we usually don't
recommend people doing it because of the dcef feature requirements ie: QOS,
etc.. but you could test it in the lab.

   Other then that, I could home  
> this off a juniper, only to be plagued by GRE tunnel and Multilink  
> issues.
> 
> The questions:
> 	
> Can you all give me an idea of what a 7513 running say 200 to 300MB a  
> sec agg. traffic would see for CPU load?  Can anyone tell me what I  
> can expect for a bandwidth limitation on the backplane of these  
> chassis?  I am pretty sure I am on crack to even thinking I could do  
> this, so any info at this point will be helpful (I have 	only loaded  
> a 7500 up to around 70MB running D-CEF/IP cache flow and never been  
> happy with the CPU load).

I'm pretty sure you could make it work even if you had to put some of
the load over a couple different cards.

  If you all concur that this is pushing the  
> limits of the 7513, then sup720 it is.  Thanks a lot for the  
> help.   //db

I'm just not a big fan of someone pushing the limits so close but
that's because I work cleaning up these networks everyday. :)

Just test it in the lab to baseline it but I'm pretty sure you could
get that traffic through the box as long as they are average packet sizes
and not sure voice.

> 	
> 
> 
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