[c-nsp] full duplex mismatch speed - dynamips

[Pavel Skovajsa]

Hello,

Actually it looks like a dynamips/IOS bug in the emulation of
GT96100-FE - see http://7200emu.hacki.at/viewtopic.php?t=4484 or
alternatively this one
http://7200emu.hacki.at/viewtopic.php?t=121&postdays=0&postorder=asc&start=30

On the other side Gert is correct this is more a cosmetic issue, as
there is no "signalling emulation" in dynamips, the L1 frames are
simply moved between the router instances through UDP tunnels and fed
directly to the interface driver of the destination driver on L1.

Therefore - having duplex or even speed mismatch is totally irrelevant
on dynamips as these issues only affect signalling...Also (as a
corollary) there is no auto-speed negotiation when connecting 10Mb/s
card to a 100Mb/s card....

-pavel



On Wed, Aug 18, 2010 at 11:03 AM, Gert Doering <gert at greenie.muc.de> wrote:
> Hi,
>
> On Wed, Aug 18, 2010 at 10:44:37AM +0200, Andreas Sikkema wrote:
>> Since Dynamips is an emulator (and from the looks of it, quite an old one)
>> it could also be a bug in the emulator itself. Or even a bug in the IOS
>> version you're using, or a combination of both.
>
> The "bug" in dynamips would be that it works even though there is a
> perceived duplex mismatch (I'd assume that it doesn't even try to
> implement half-duplex mode on FE).
>
> Just telling both sides to configure the interface to "duplex full"
> should be enough to silence the IOSes involved.
>
> gert
> --
> USENET is *not* the non-clickable part of WWW!
>                                                           //www.muc.de/~gert/
> Gert Doering - Munich, Germany                             gert at greenie.muc.de
> fax: +49-89-35655025                        gert at net.informatik.tu-muenchen.de
>
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