[c-nsp] 7500 RSP8 Throughput Ability

[Rodney Dunn]

I think I've tried to explain the bottlenecks for this platform
before so I'm gonna give the brief version here.

It's software forwarding. If you have dCEF and all your features
are dCEF capable then your limit most likely with quickly become
the VIP CPU's as you scale up the traffic.

I've never seen a customer in a production network get to the bus
limitations before the CPU is being overrun on the LC for this box.
Well, I shouldn't say never...I saw it once when a customer was doing
a database replication and all packets were 1400 bytes.

If you add more cards you can switch more packets IF the packet
flow takes different paths through the box. You can't add 5 cards
to feed one egress card or you will eventually overload it.

If you want GE rates don't bother with a 75xx.

Rodney

On Thu, Dec 08, 2005 at 04:17:36PM -0200, Gustavo Rodrigues Ramos wrote:
> I'm running just one GEIP on an 7513 and the box does about 120 Mbps 
> with 60% CPU. I think that with more GEIP interfaces it could more than 
> that.
> 
> Am I wrong?
> 
> Gustavo.
> 
> 
> 
> 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.
> > 
> > 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.   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).  If you all concur that this is pushing the  
> > limits of the 7513, then sup720 it is.  Thanks a lot for the  
> > help.   //db
> > 	
> > 
> > 
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