Hi Rajat,
i opened an TAC case and the engineer solved my problem. i got a whole bunch of L3/SVI interfaces and a few of them did not include the "no ip redirects" command. after applying it to all interfaces the cpu load dropped to 25-30%. here is the original mail:
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- After checking further saw that there were noticeable drops by looking at the output of 'sh plat cpu packet driver', it's clear that CPU is getting packets at high rate in Queue number 1 for the event(57) 'Adj Same If(IP Redirects or routing via same interface)' which would be causing the high CPU :
switch# sh plat cpu packet driver
Forerunner Packet Engine 0.278
Receive Queues: dropped packets summary
Qu Total Packets Drop No Cell Drop Overrun Drop Underrun
19 103593805 3658 0 0
57 99598717 338725 0 0
<<<<<<<<<<<<<<<
Receive Queues: dropped packets summary
Qu Total Packets Drop No Cell Drop Overrun Drop Underrun
19 133629002 3658 0 0
57 159097464 635503 0 0
<<<<<<<<<<<<<
Action Plan:
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- We need to plan to disable "IP Redirects" on SVI/L3 interfaces on the switch. As a best practice we should disable ip redirects if we are not using the same as per design :
http://www.cisco.com/en/US/products/hw/switches/ps663/products_tech_note09186a00804cef15.shtml#redirects
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Regards,
Gernot
