[c-nsp] 7204 performance

[David Barak]

--- ted klugman <tedklugman at yahoo.com> wrote:
> 
> --- Rey Martin <rey.martin at qalacom.com> wrote:
> > 
> >>> An engineer suggested that the root of the
> problem
> is that our 7204 
> >>> routers (with NPE-400) is adding a large amount
> of
> latency (on the 
> >>> order of 30-50ms), and that the solution is to
> move our ATM 
> >>> connections to our core networks with FlexWAN
> modules in our 
> >>> Cat6500's
> >>
> >> That's absurd.  There's no way that an NPE-400
> box
> is going to add any 
> >> significant amount of latency with such a small a
> connection off of a
> >> PA-A3
> >> (or even A6 or whatever), unless the box is being
> constantly hammered 
> >> through other higher speed ports.
> >>
> >> I've used NPEs and VIPs with PA-A3 cards for at
> least 4 years now and 
> >> the results have always been excellent.  Even the
> CX bus AIP adapter 
> >> running with an old RSP2 (test box :) handles
> 20Mb
> loads gracefully.
> >>
> >
> >Agree with this, 2M is 'nothing' for NPE-400.
> >
> >btw since we are talking about 'high' latency,
> perhaps you could give some number? just curious..
> 
> We're seeing ~200ms from the east coast US to Tokyo.
> Engineer claims that by deep-sixing the 7204's and
> bringing the DS-3's to our core 6500's through
> FlexWAN
> modules in all three locations, we can shave 30-50ms
> of latency. I don't believe it.

doing some traceroutes from the publicly available
servers at traceroute.org to/from some east coast
locations under my control, I saw 170-300ms, with most
of the variation happening in the US.  It was
consistently about 110ms to cross the pacific, and the
rest was dependend upon domestic topology.

Are there any intervening IP hops between your node
here and the one in .jp?

David Barak
Need Geek Rock?  Try The Franchise: 
http://www.listentothefranchise.com


		
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