From: dburnett@click1.net
Date: Wed Mar 31 2004 - 12:24:50 GMT-3
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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