I believe that sub-interface MTU settings are irrelevant - as Neil suggests,
they revert to the framer MTU which resides on the main interface. However,
some non-physical interfaces allow MTU settings, ie Virtual Templates and
BVIs. It seems that the SAR handleron ATM interfaces needs to carve PDU
buffers upon initialization, thus, dynamic MTU adjustment on a per-packet
basis may not be possible. This is ops experince, though - I don't work for
Cisco....
HTH,
-chris
-----Original Message-----
From: Neil J. McRae [mailto:neil@COLT.NET]
Sent: Tuesday, January 25, 2000 4:14 AM
To: Rafi Sadowsky
Cc: Neil J. McRae; Tony Tauber; Steve Meuse; Jim Warner;
cisco-nsp@puck.nether.net
Subject: Re: [nsp] CEF stability
On Tue, 25 Jan 2000 11:11:23 +0200 (IST)
Rafi Sadowsky <rafi@meron.openu.ac.il> wrote:
> on an ATM interface its probably better to enlarge the main interfaces MTU
> to (at least) the MTU on the sub-interface or strange things may happen
We have the main set at 1500 and the sub at 1500 works fine. having
a different MTU on the main and sub seems to force the subs to use
the main interface MTU.
Neil.
-- Neil J. McRae C O L T I N T E R N E T neil@COLT.NET
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