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OSPF CPU usage in IOS 12.0(5)
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Scott Parmenter
Jul 23, 1999, 3:00:00 AM7/23/99
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You may be seeing the effects of the OSPF Pacing feature that was implemented
somewhere in the 12.0 code. Prior to this feature, all LSA's were refreshed
every 30 minutes, which in our network, meant a high cpu spike every 30
minutes. (This spike is not always noticeable on a network mgmt. station
unless your polling intervals are very short.) Now the LSA's are grouped and
refreshed in staged intervals which eliminated the spikes, but increases the
average sustained utilization. Here is a link that describes this new
feature:
somewhere in the 12.0 code. Prior to this feature, all LSA's were refreshed
every 30 minutes, which in our network, meant a high cpu spike every 30
minutes. (This spike is not always noticeable on a network mgmt. station
unless your polling intervals are very short.) Now the LSA's are grouped and
refreshed in staged intervals which eliminated the spikes, but increases the
average sustained utilization. Here is a link that describes this new
feature:
HTH,
Scott Parmenter
CCIE #4327
>>> Robert Kiessling <rob...@easynet.de> 07/15 4:23 PM >>>
when moving from 11.2 to 12.0(5) on a 3640, I noticed an average CPU
usage of about 12% by the process "OSPF Router", which has not been
there before, using the very same configuration. The average usage is
generated by a usage oscillating between 0% and 35% in an interval of
some seconds.
"debug ip ospf *" and "debug ip routing" does not show any curious
activity. Apart from moderate changes in external announcements, the
environment is stable. The router is ASBR and ABR for several NSSA
areas. Routing does not seem to be influenced.
Bug toolkit did not yield a match. Any ideas what this may be caused by?
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