SUP2 / MFSC2 CPU Util - IP Input - GRE switching

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Jan 29th, 2008
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I've spent quite a bit of time trying to figure this one out, and am getting just about nowhere. I followed through the High CPU Util troubleshooting processes, and found that the RP is looking at every GRE packet going across the switch... not terminating at the switch. It's a 6509 with sup2/mfsc2 as listed in the title, running ipservices-wan-mz 12.2(18)sxf4. I havn't noticed this problem going across any other switches or routers, including a 3620 running 12.3, a 2811 running 12.3, a 3550, an alcatel swtich, etc. Any insight on this is greatly appreciated!


Chris Eads

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aravindhs Tue, 01/29/2008 - 06:26
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Hi Chris,

It would be easier if you could post your config. And, the commands/method you used to confirm that the GRE transit packets are causing a high CPU util.. like for eg. show proc spu sorted ; show ip cef ; show ip traffic ; show inter stats/switching ; sh ip cache flow etc et .. and how you actually confirmed your inference about the switching path of the GRE packet.




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