Without more detailed info about your router, its hard to say. Its obvious that your router is having to process alot of IP traffic (as opposed to fast switching it through). Are you running:
How many PPS is this router pushing? Is it being overused under normal conditions? Is it an edge router that is under a DOS attack? Do you have someone running port scans through it and extended access-lists on interfaces?
Feel free to contact me directly if you want to run through some ideas but don't wish to post config info on a public forum.
91/41.... 91-41 = 50, so about 50% of your time is interrupt, and about 41% of your time is processor. It's hard to know if these numbers are right, or wrong, with no history/etc., but if you feel they are too high, then do this:
-- take a look at show proc cpu and see if you can figure out which process is taking up a lot of time. Then try to figure out what that process is doing (is it legitimate). Check the top two or three processes.
-- take a look at the amount of traffic this box is switching. High traffic numbers will cause you to have high interrupt context cpu util. If the traffic level feels low, then check show align for alignment errors and spurious accesses.
Come to RST-321 at networkers--I have an entire section on figuring out high cpu issues.
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