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Cisco Bug: CSCuq08184 - ip cef accounting non-recursive - on 3850 causes CPU to spike

Last Modified

Sep 24, 2018

Products (1)

  • Cisco Catalyst 3850 Series Switches

Known Affected Releases

n/a

Description (partial)

Symptom:
ip cef accounting non-recursive - on 3850 causes CPU to spike for recursive and non-recursive prefixes

Conditions:
This command accounts for traffic hitting a recursive prefix against the non-recursive prefix that its next hop resolves through.
Hence, we are seeing the packets being punted to the cpu when we have accounting for non-recursive prefixes too
This issue is seen only on 3850. Tested on 6500 and none seen.

So let's take the following example

10.0.0.0/24 via 11.11.11.11
20.0.0.0/24 via 11.11.11.11
11.11.11.0/24 via 2.2.2.2, eth0

When non-recursive accounting is turned on traffic hitting 10.0.0.0/24 and 20.0.0.0/24 is accounted using a counter associated with 11.11.11.0/24

Related Community Discussions

Do I have a loop in the stack ?
Hi, Cpu goes sometimes 100% , average is 40% stack members are 3850 switch ,  Just migrated from 3560 , pvst  switches  to 3850        History information for system:                                                                      111111111111111111111111111111111111111111111111111111111111     666669999988888555557777799999888885555599999888885555588888 100                                                               90                                                               80       ...
Latest activity: Jun 14, 2015
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