[c-nsp] Cisco ISR T3

[Kinczli Zoltán]

hello,

  afaik, there is lot of buffering overhead associated with eth frame <->
atm cell conversion, and that buffering has to be done by the cpu.

And this seems to be true or E3/T3 NM/PA case as well.
  (buffering, not the cells :))  )

-zoltan


-----Original Message-----
From:	John Neiberger [mailto:jneiberger at gmail.com]
Sent:	Tue 11/1/2005 7:05 AM
To:	Dave Temkin
Cc:	cisco-nsp at puck.nether.net
Subject:	Re: [c-nsp] Cisco ISR T3
This is something I've never understood. Why do devices that can
process Fast Ethernet without even blinking have such a problem with
DS3? In my mind, a router that can handle multiple FE ports or even a
single GE port should have no problem running an OC-3.  ;-)

Unfortunately, it doesn't seem to work that way.

John

On 10/31/05, Dave Temkin <dave at ordinaryworld.com> wrote:
> You can get line rate DS-3 with a decent mix of packets on a 2821 (with my
> testing), at least with traffic flowing mostly in one direction.  If you
> have line rate in both directions you'd need a 3845.
>
> -Dave
>
> On Mon, 31 Oct 2005, Kenny Sallee wrote:
>
> > Found conflicting documentation on CCO regarding what
> > ISR's can handle full and subrate T3's on the
> > NM-1T3/E3 for example here:
> >
> > http://www.cisco.com/en/US/products/hw/modules/ps2797/products_data_sheet09186a008010fba2.html
> >
> > says 3825 and 45 can handle full T3.  And here:
> >
> > http://www.cisco.com/en/US/products/ps5855/prod_models_comparison.html
> >
> > Says 3825 can only handle 1/2 T3.
> >
> > So couple questions:
> >
> > 1.)  What does subrate T3 mean?  2851 can handle
> > subrate - but what exactly does that mean?
> > 2.)  Does anyone have real world experience with 2851,
> > 3825 or 3845 running the NM-1T3/E3 sub or full rate T3
> > if so can you relate your experince?
> > 3.)  What would be the smallest router anyone would
> > recommend for full T3 and all BGP routes?
> >
> > Thanks,
> > Kenny
> >
> >
> >
> >
> > __________________________________
> > Yahoo! Mail - PC Magazine Editors' Choice 2005
> > http://mail.yahoo.com
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--
"Nothing will keep a person in everlasting ignorance so much as
contempt prior to investigation"

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