JUNOS calculates kernel and user CPU separately so what you want to monitor
is idle CPU.
Idle CPU close to 0 (in single digits) over prolonged period is worth
investigating.
AFAIK, the is no Juniper OID for 5min averaged CPU but you can always write
an event script and populate jnxUtil MIB with numbers from "show chassis
routing-engine" (note that only master RE CPU is displayed so for backup RE
CPU you have to run the script on backup RE as well and somehow get the data
from backup RE to master RE).
Rgds
Alex
----- Original Message -----
From: "harbor235" <harbor...@gmail.com>
To: <juniper-nsp@puck.nether.net>
Sent: Wednesday, July 01, 2009 3:13 PM
Subject: [j-nsp] High CPU and interrupts
I am trying to configure a monitoring system to alarm using thresholds for
CPU utilization and
interrupts. Junos has separation in the control and data planes so i would
assume brief spikes
in CPU should not be a problem. However, sustained high COU should be an
indicator for a investigation
and troubleshooting. Cisco has avgBusy5 OID that captures the cpu overage
over a 5 minute interval,
does Junos have something similar? I would think that a sustained CPU
utilization of >90% should warrant
investigation, is there anything similar for interrupts and interface
stats that anyone is looking at?
Mike
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