From: Peter van Oene (pvo@usermail.com)
Date: Wed Mar 31 2004 - 20:33:12 GMT-3
At 12:41 PM 3/31/2004, Richard Dumoulin wrote:
>Ouch !! How did you notice that. Is it demonstrable ?
If you don't have one already (in your organization) get a proper tester
(ixia/agilent etc) and before you buy new kit, test it out. It's often
pretty enlightening.
>--Richard
>
>-----Mensaje original-----
>De: McCallum, Robert [mailto:robert.mccallum@thus.net]
>Enviado el: miircoles, 31 de marzo de 2004 17:33
>Para: 'dburnett@click1.net'; Howard C. Berkowitz
>CC: ccielab@groupstudy.com
>Asunto: RE: What IOS really does with commands (was Re: ISIS Problem.
>
>
>Something for you all to note is that many routers and IOS versions when you
>do a wr mem you induce a 350ms
>Outage of traffic flowing through the box. Now some of you may say "big
>deal" but put a voice switch or a time
>Sensitive application and watch it die every time you save the config. Some
>IOS versions now only do this the first
>Time you save the config i.e. just after it is reloaded others still do it
>every time. Also changing the boot system commands induces the same delay
>(there is no way round this).
>
>Robert McCallum
>CCIE #8757 R&S
>01415663448
>07818002241
>
> > -----Original Message-----
> > From: dburnett@click1.net [mailto:dburnett@click1.net]
> > Sent: 31 March 2004 16:25
> > To: Howard C. Berkowitz
> > Cc: ccielab@groupstudy.com
> > Subject: Re: What IOS really does with commands (was Re: ISIS Problem.
> >
> >
> > Where may someone find more information (as much as may be publicly
> > available) about how IOS creates and stores the data
> > structure that it modifies from entered keywords (aka commands)?
> >
> > ----- Original Message -----
> > From: "Howard C. Berkowitz" <hcb@gettcomm.com>
> > To: <ccielab@groupstudy.com>
> > Sent: Sunday, March 28, 2004 9:20 PM
> > Subject: What IOS really does with commands (was Re: ISIS Problem.
> >
> >
> > > At 7:56 AM -0800 3/28/04, Joseph Rinehart wrote:
> > > >?Sometimes the router will slightly alter commands in the active
> > > >configuration when you enter them. I had this happen on an
> > > >access-list
> > last
> > > >week and it nearly drove me crazy at first.
> > >
> > > Something worth knowing to anyone studying for CCIE, but rarely
> > > spelled out specifically, is that the router doesn't just
> > record, or
> > > even alter the commands when you enter them -- it
> > interprets them and
> > > then throws them away. The earlier courses can give you the
> > > impression that the commands are entered are stored
> > somewhere in RAM.
> > > They are not.
> > >
> > > On slower routers, did you ever notice the slight delay
> > before "show
> > > running" displays? Show running is essentially a reverse
> > compiler or
> > > formatted dump that goes throgh the data structures of the
> > router and
> > > creates the configuration statements it thinks would have put the
> > > router into the states reflected by the current values of the data
> > > structures. The delay is due to the significant processing
> > involved
> > > in recreating the statements.
> > >
> > > >
> > > >I think this is what is happening, and you would need to
> > change it by
> > > >specifying Level-1 in the redistribution statement, I believe the
> > > >syntax
> > is
> > > >"redistribute isis 1 level-1-only metric 4"
> > >
> > >
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