[c-nsp] 7200VXR bandwidth points

[Everton da Silva Marques]

On Tue, Jun 27, 2006 at 08:47:21AM -0400, Justin M. Streiner wrote:
> On Tue, 27 Jun 2006, Fredrik.Jacobsson at enskilda.se wrote:
> 
> > How can one tell if oversubscribing bandwidth points
> > causes drops on the bus? Is there a CLI command?
> > Or perhaps SNMP?
> 
> Oversubscribing one or both of the busses by itself should
> not cause any drops.  It all depends on how much traffic
> you're pushing through the router.

Thought there is the following comment:

  Technically, you should not exceed the bandwidth points
  on a 7200 not because of the bus capacity, but due to
  instantaneous bus bandwidth and memory latency. In other
  words, this is not a CPU-loading issue, but a bus
  bandwidth issue. At some point (regardless of packet
  throughput), you will get memory requests from all of
  them at the same time because all have data on them.
  In this situation, the PCI bus contention cannot
  guarantee that all the PAs will be serviced before
  you get overruns and possibly PCI bus timeouts. 

Troubleshooting Bandwidth Points
http://tinyurl.com/sx9ft