[NSP] Maximum High Speed Interfaces on 3640

[Temkin, David]

It does exactly what it says on the box.  Be lucky you get that much out
of it.  With smaller packet sizes I'm lucky to get 20-30Mbps out of it.

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Alex Foster
Sent: Monday, February 16, 2004 12:50 PM
To: cisco-nsp at puck.nether.net
Subject: [NSP] Maximum High Speed Interfaces on 3640


I know Cisco claim the maximum number of High speed interfaces supported
by the 3640 is two - but is it possible to run 4 without maxing out the
CPU.  I have tested the 3640 with 2 ATM OC3 modules and 1 FE module and
average about 60-70% util. on load.  If I introduce another FE interface
the CPU maxs out.  Are there any workarounds/configuration tricks to
overcome this - or is this a case of "it does exactly what is says on
the box".  The 3640 has 128MB memory and the iomem is set to 30/70
split.

I am also curious to find out if anybody has overcome the limitations of
the OC3 module
and its pretty dire throughput.   I appreciate the module is not
designed to
operate at
wire speed by the most I have got out of one module is around 45 to 50
Mbps. Any tips/advise would be appreciated.  Again cisco claim you can
achieve upto 80Mbps throughput with larger packet size - excuse my
ignorance here - is this achieved by increasing the MTU on the ATM
interface/sub-interface??

Regards

Alex




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