[nsp] Throughput of 100 Mbps

Terry Baranski tbaranski at mail.com
Thu Nov 6 17:26:26 EST 2003

> what's the smallest (read: cheapest :-) router that can 
> process 100 Mbps of traffic?

A 3745 per a Cisco rep.  But I don't know if they just gave me the
"official answer" by looking at the pps rating and running the numbers
with 64-byte packets (225,000 * 64 = ~110Mbps), or if the statement
applies to full-sized packets as well (e.g., from testing that they've
done in-house).

The reason this matters is because I was able to get 40Mbps out of a
2621 with full-sized packets using TTCP.  The 2621's official pps rating
is 25,000, which with 64 byte packets is ~12Mbps.  So the bandwidth you
can get with full-sized packets is, not surprisingly, significantly
higher than with minimum-sized packets.  If this is the case for the
3x00 series as well, there's hope that something cheaper than a 3745 may
be able to pull off 100Mbps will large packets. (Note however that it's
actually 200Mbps of traffic that saturates a full-duplex FE interface,
if that's a concern in your case.)

Do any of the Cisco people that hang out here have any information on
this?  I've asked this elsewhere and haven't had any luck getting an
> Playing with a 3620, I could only get around 40 Mbps. What 
> next? Do I need 7200? What about the 2600 XM, which I know 
> very little about?...

Given what I got with a 2621 I would have thought a 3620 would be able
to do somewhat better, but perhaps not.  What kind of test did you run
to get your number?


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