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RE: OT - Reserving router memory to allow access during critical times posted 05/07/2004
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The scheduler commands only reserve CPU, not memory.  If you're really
in a bind and can't console in, pull a LAN interface cable out.  Within
a couple seconds, the ARP entries, NAT translations, and routes
associated with that interface should time out, freeing up memory and
CPU, allowing you in.  Certainly faster than a power cycle of the
router.  Of course it's a remote router, have someone pull out a cable
on the other side of the router (not your side, obviously).  Once you
can get in and look around, figuring out the cause shouldn't be too bad
with some 'sh proc' commands...


Chuck Church
Lead Design Engineer
CCIE #8776, MCNE, MCSE
Wam!Net Government Services - Design & Implementation Team
13665 Dulles Technology Dr. Ste 250
Herndon, VA 20171
Office: 703-480-2569
Cell: 703-819-3495
cchurch@xxxxxxxxxxxxx
PGP key:
http://pgp.mit.edu:11371/pks/lookup?op=index&search=cchurch%40wamnetgov.
com
-----Original Message-----
From: nobody@xxxxxxxxxxxxxx [mailto:nobody@xxxxxxxxxxxxxx] On Behalf Of
MMoniz
Sent: Thursday, May 06, 2004 8:29 PM
To: Brian McGahan; Brian Sims; ccielab@xxxxxxxxxxxxxx
Subject: RE: OT - Reserving router memory to allow access during
critical times

If I was to do scheduler allocate, would this reserve the memory
permanently or just release mem as needed for this?

I looked into this before but never could really get a grasp on it.

Thanks,

mike



-----Original Message-----
From: nobody@xxxxxxxxxxxxxx [mailto:nobody@xxxxxxxxxxxxxx]On Behalf Of
Brian McGahan
Sent: Thursday, May 06, 2004 6:35 PM
To: MMoniz; Brian Sims; ccielab@xxxxxxxxxxxxxx
Subject: RE: OT - Reserving router memory to allow access during
critical times


	It depends what is causing the congestion.  If it's IP input
related, then telnet would also be affected.

Brian McGahan, CCIE #8593
bmcgahan@xxxxxxxxxxxxxxxxxxxxxx

Internetwork Expert, Inc.
http://www.InternetworkExpert.com
Toll Free: 877-224-8987 x 705
Outside US: 775-826-4344 x 705


> -----Original Message-----
> From: MMoniz [mailto:ccie2002@xxxxxxxxxxxxxxx]
> Sent: Thursday, May 06, 2004 3:04 PM
> To: Brian McGahan; MMoniz; Brian Sims; ccielab@xxxxxxxxxxxxxx
> Subject: RE: OT - Reserving router memory to allow access during
critical
> times
>
> Right...but don't I have a much better chance accessing via com or aux

> during these periods than a telnet connection?
>
> It seems that in these sits the only way to stop it is to console in
and
> get
> lucky or power cycle!! Which if it is
> remote sometimes not possible. But telnet never works!
>
> Will scheduler solve this? Even like when a debug or crazy instance 
> baffles the router?
>
> Thanks,
>
> mike
>
>
>
> -----Original Message-----
> From: Brian McGahan [mailto:bmcgahan@xxxxxxxxxxxxxxxxxxxxxx]
> Sent: Thursday, May 06, 2004 5:54 PM
> To: MMoniz; Brian Sims; ccielab@xxxxxxxxxxxxxx
> Subject: RE: OT - Reserving router memory to allow access during 
> critical times
>
>
> 	No.  Console access is not a high priority process.  If it were
then 
> you wouldn't have trouble turning off debug commands or accessing the 
> cli during periods of cpu overload, which you do.
>
> Brian McGahan, CCIE #8593
> bmcgahan@xxxxxxxxxxxxxxxxxxxxxx
>
> Internetwork Expert, Inc.
> http://www.InternetworkExpert.com
> Toll Free: 877-224-8987 x 705
> Outside US: 775-826-4344 x 705
>
>
> > -----Original Message-----
> > From: MMoniz [mailto:ccie2002@xxxxxxxxxxxxxxx]
> > Sent: Thursday, May 06, 2004 2:51 PM
> > To: Brian McGahan; Brian Sims; ccielab@xxxxxxxxxxxxxx
> > Subject: RE: OT - Reserving router memory to allow access during
> critical
> > times
> >
> > On this topic, doesn't traffic coming from the Con or Aux port take 
> > priority? So if my devices are connected via a term serv I can 
> > always, well almost, interupt the router and take control?
> >
> > mike
> >
> > -----Original Message-----
> > From: nobody@xxxxxxxxxxxxxx [mailto:nobody@xxxxxxxxxxxxxx]On Behalf
Of
> > Brian McGahan
> > Sent: Thursday, May 06, 2004 5:21 PM
> > To: Brian Sims; ccielab@xxxxxxxxxxxxxx
> > Subject: RE: OT - Reserving router memory to allow access during 
> > critical times
> >
> >
> > Brian,
> >
> > 	Try either the "scheduler interval" or "scheduler allocate"
> > command.
> >
> > HTH,
> >
> > Brian McGahan, CCIE #8593
> > bmcgahan@xxxxxxxxxxxxxxxxxxxxxx
> >
> > Internetwork Expert, Inc.
> > http://www.InternetworkExpert.com
> > Toll Free: 877-224-8987 x 705
> > Outside US: 775-826-4344 x 705
> >
> >
> > > -----Original Message-----
> > > From: nobody@xxxxxxxxxxxxxx [mailto:nobody@xxxxxxxxxxxxxx] On
Behalf
> > Of
> > > Brian Sims
> > > Sent: Thursday, May 06, 2004 11:05 AM
> > > To: ccielab@xxxxxxxxxxxxxx
> > > Subject: OT - Reserving router memory to allow access during
> critical
> > > times
> > >
> > > The "memory reserved console" command only works on service
provider
> > IOS
> > > images. Does anybody know of a way I can configure a router to
> reserve
> > > memory, so that I can access it during high memory/process
> > utilization.
> > > The routers will be running 12.2T and above. Having to manually
> reboot
> > the
> > > router is tough sometimes. Any help would be greatly appreciated.
> > >
> > >
> > >
> > > Brian Sims, CCDP, CCNP
> > > Network Engineer
> > >
> > >
> >
>
_______________________________________________________________________
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