[c-nsp] Time based netflow sampling on 7600

2008-09-15 Thread Andrew Cheng 
Hi Everybody


Has anybody had any real world experiences running time based sampling
on a 7600 as a way to still be able to extrapolate traffic through the
box even if the TCAM cache fills up? 

From what I've read in the documentation, if you configure say a time
based sampling rate of 1024, it simply exports the first 4ms of every
4096ms window (router actually says 8 in 8192). Hence, if the cache
fills up within the export interval, you can still multiple by the
sampling rate and get something rather accurate. 

I've tested this in a lab environment with 25kflows/sec of non-bursty
traffic, (ie, not even filling the TCAM in the 8192ms window) and the
netflow records are way way out. However if I change to packet based
sampling, they're 99% accurate (That is until flows/sec increase and
fill the TCAM of course..)

Thanks

Andrew





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Re: [c-nsp] GE over copper port adapter for a 7206VXR

2007-10-10 Thread Andrew Cheng 
If you can, get a Gigabit I/O, that way you won't lose any bandwidth
points because you're running a G1. 

I can confirm that Copper GBIC's work fine in the I/O aswell. 

Andrew

 On 10/9/07, Vincent Aniello vincent.aniello at pipelinefinancial.com
wrote:
 
  Does Cisco offer a Gigabit Ethernet over copper port adapter for a
Cisco
  7206VXR chassis?  I have a NPE-G1 processor in the router, which
comes
  with 3 GE over copper ports, but I need to add one more.  The PA-GE
card
  seems to only accept fiber connections.  Any help would be
appreciated.
 
  Thanks.
 
  --Vincent


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