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!