Re: is a NAT device/'home router' - a router?
- From: "stephen" <stephen_hope@xxxxxxxxxxxx>
- Date: Fri, 30 Sep 2005 21:46:31 GMT
"Rick Jones" <rick.jones2@xxxxxx> wrote in message
news:Xve%e.13571$Oe2.3140@xxxxxxxxxxxxxxxxxxx
> Robert Redelmeier <redelm@xxxxxxxxxxxxxxx> wrote:
> > J. Clarke <jclarke.usenet@xxxxxxxxxxxxxxxx> wrote:
> >> Actually it is not uncommon for GP CPUs to be used for
> >> routers--some Cisco models have Intel processors and PCI
> >> Buses and are basically PCs with a different OS.
>
> > I'm appalled. Those will be able to handle a few 100 Mbit/s,
> > not more. The PCI bus cannot handle gigabit (too much overhead).
>
> Um, _which_ PCI bus? There are roughly 6 of them IIRC, ranging from
> 33x32, to 66x32, 33x64, 66x64, 133x64 and 266x26 (the latter being
> PCI-X). And then there is PCIe...
FWIW the cisco 7204vxr (which is still a standard box at work for E3 or
STM-1 WAN pipe termination) has 2 off 600 Mbps "PCI" buses. AFAIR it has
MIPs type CPU / core. Mind you it is an old design now, and the CPU thruput
has gone up by at least a factor of 10, and it now has QoS and other
processing offloaded for some jobs.
The newer versions of processor for the box get more bandwidth as there are
3 Gig ports which dont touch the buses.
it doesnt really matter how much CPE and I/Obandwidth you have as long as it
is "enough" for the job.
Even with Ethernet WAN links you only need special architectures when you
pay serious amounts for the bandwidth - and at that point you can afford
routers with "better" architectures without making a big difference to
systems cost.
>
> > Serious routers need backplanes & switching ASICs.
>
> That may be - the definition of "serious" may be somewhat subjective.
> A home "router" may be just as "serious" to its end-user as a core
> Internet router is to a NOC.
just a different order of magnitude on the price tag :)
>
> rick jones
> --
> a wide gulf separates "what if" from "if only"
> these opinions are mine, all mine; HP might not want them anyway... :)
> feel free to post, OR email to rick.jones2 in hp.com but NOT BOTH...
--
Regards
stephen_hope@xxxxxxxxxxxx - replace xyz with ntl
.
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