High Processor Rates on Routers.

Jim Deleskie jdeleski at rci.rogers.com
Wed Nov 6 15:32:30 UTC 2002

Try a show proc cpu to see what the router is doing if you really want to
find out.


-----Original Message-----
From: internetguy205 at hotmail.com [mailto:internetguy205 at hotmail.com]
Sent: Wednesday, November 06, 2002 8:22 AM
To: nanog at merit.edu
Cc: headguy at techies.com
Subject: High Processor Rates on Routers.

Ladies & Gentleman.

Was wondering if it is common for processor rates on higher end Crisco boxes
to race from 1 or 2 % show on the 5 second processor rate interval, to
anywhere from 70 to 90 %, instanteously, then drop back down to 1 or 2 %
after 10 seconds.

The above mentioned scenario would happen every 30 seconds.

The higher end boxes are very lightly loaded, with total traffic throughput
of maybe 100 Meg, in some cases.

Think that if these boxes are loaded more, to the point where the aggragated
throughtput approaches a Gig, this will cause the processors to run at high
levels constantly, driving the CPU rates indicators on the box for 1 & 5
minute intervals up to the values mentioned above. ( 70 to 90 % ).

Higher end devices would be something like 7200, 7500, 12xxx series routers.

This scenerio would be in a large ( very large network, atleast a tier 2 OR
tier 1 provider )...  possible rebutals to the fact that processors could
race like mentioned above on lightly loaded devices of a higher end nature
would be that BGP scanner is causing the problem, Telnet to the devices,
show config when on the devices...

So what happens to the processor rates when the devices are more heavily
loaded ( 1 G aggragated throughput opposed to 100 Meg throughtput )?  Will
the devices work worrectly AND would a large internet be stable ?

Is it also common for BGP Routing tables to be changing version every 1/2
second ?  Same high end routers, lightly loaded, large Autonomous System.

Thank-you for your time on this query.

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