RE: Antw: Router CPU usage high

["MERY Olivier (Neuilly Gestion)" <olivier.mery@cetelem.fr>]

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Some years ago, installing a second netview (it was V5) for development on
the net lead one of our 7500 to 100% cpu (99% on IP SNMP) which prevent it
to its primary job : packet forwarding. Even serial console access was
blocked. It immediately stopped after netview shutdown. So be careful to
your polling interval config and how many manager you run. I think V6 is
handling discovery thru CDP first, V5 did it on arp cache only which needs
more SNMP accesses.


Olivier MERY
Responsable Réseau
CETELEM
20, avenue Georges Pompidou
92595 LEVALLOIS-PERRET Cedex
Tel.    : +33146399729
Fax     : +33146391554
Email   : <mailto:olivier.mery@cetelem.fr>



-----Original Message-----
From: Michael Seibold [mailto:Michael.Seibold@gek.de]
Sent: Friday, January 05, 2001 11:06 AM
To: nv-l@tkg.com
Subject: Antw: [NV-L] Router CPU usage high


We need to know how you configured snmp Configuration for this router.
Normally this high CPU load corresponds with the Configuration polling
Interval. Set number of route entries to 50 or 100.

There's been a lot of discussion about this topic last year, you may look up
the archives.

You may debug snmp on the cisco-router to see which mib values are
transferred, but it will probably crash the router...

Michael Seibold
GEK Gmünder Ersatzkasse


>>> michael.hamm@tudor.lu 05.01.2001  10.41 Uhr >>>

Strange CPU usage on a CISCO Router.

I poll just 1 time a minute to recive just one MIB value (CPUbusy)
to check the CPU usage of the router.

Nearly periodically  every half houre the CPU usage go up to 70%.
Once or twice a day the CPU usage go up to 99% - 100% for 1 houre.

in this time, the router shows me 85% of CPU usage go to IP SNMP Process.

Its a CISCO 2500  with IOS 11.3

Is it possible that NetView with one Request a minute is resonsible
for this??? I cant belive. But ther is no other machine using
SNMP to acces the router. And the SNMP process thakes 85% of CPU.

I check the interfaces for SNMP trafic. It is close to zero.

What can I do????

_________________________________________________________________________
NV-L List information and Archives: http://www.tkg.com/nv-l

_________________________________________________________________________
NV-L List information and Archives: http://www.tkg.com/nv-l

Some years ago, installing a second netview (it was V5) for development on the net lead one of our 7500 to 100% cpu (99% on IP SNMP) which prevent it to its primary job : packet forwarding. Even serial console access was blocked. It immediately stopped after netview shutdown. So be careful to your polling interval config and how many manager you run. I think V6 is handling discovery thru CDP first, V5 did it on arp cache only which needs more SNMP accesses.

Olivier MERY
Responsable Réseau
CETELEM
20, avenue Georges Pompidou
92595 LEVALLOIS-PERRET Cedex
Tel.    : +33146399729
Fax     : +33146391554
Email   : <mailto:olivier.mery@cetelem.fr>

-----Original Message-----
From: Michael Seibold [mailto:Michael.Seibold@gek.de]
Sent: Friday, January 05, 2001 11:06 AM
To: nv-l@tkg.com
Subject: Antw: [NV-L] Router CPU usage high

We need to know how you configured snmp Configuration for this router. Normally this high CPU load corresponds with the Configuration polling Interval. Set number of route entries to 50 or 100.

There's been a lot of discussion about this topic last year, you may look up the archives.

You may debug snmp on the cisco-router to see which mib values are transferred, but it will probably crash the router...

Michael Seibold
GEK Gmünder Ersatzkasse

>>> michael.hamm@tudor.lu 05.01.2001  10.41 Uhr >>>

Strange CPU usage on a CISCO Router.

I poll just 1 time a minute to recive just one MIB value (CPUbusy)
to check the CPU usage of the router.

Nearly periodically  every half houre the CPU usage go up to 70%.
Once or twice a day the CPU usage go up to 99% - 100% for 1 houre.

in this time, the router shows me 85% of CPU usage go to IP SNMP Process.

Its a CISCO 2500  with IOS 11.3

Is it possible that NetView with one Request a minute is resonsible
for this??? I cant belive. But ther is no other machine using
SNMP to acces the router. And the SNMP process thakes 85% of CPU.

I check the interfaces for SNMP trafic. It is close to zero.

What can I do????

_________________________________________________________________________
NV-L List information and Archives: http://www.tkg.com/nv-l

_________________________________________________________________________
NV-L List information and Archives: http://www.tkg.com/nv-l