Ouch !! How did you notice that. Is it demonstrable ?
--Richard
-----Mensaje original-----
De: McCallum, Robert [mailto:robert.mccallum@xxxxxxxx]
Enviado el: miircoles, 31 de marzo de 2004 17:33
Para: 'dburnett@xxxxxxxxxx'; Howard C. Berkowitz
CC: ccielab@xxxxxxxxxxxxxx
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@xxxxxxxxxx [mailto:dburnett@xxxxxxxxxx]
Sent: 31 March 2004 16:25
To: Howard C. Berkowitz
Cc: ccielab@xxxxxxxxxxxxxx
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@xxxxxxxxxxxx>
To: <ccielab@xxxxxxxxxxxxxx>
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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