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IPS IOS causing router frozen

hi All,

We have a number of IPS IOS routers. We turn IPS on and left the IPS config as default.

When traffic goes up to 20Mbps, the router is hung and not reponsed.

Router is 3845 and 512DRAM

IOS ver 12.4 15T4.

the "sh process cpu his" shows that CPU util went up to 100% sometime.

Does Anyone know how to reduce the CPU util or any recommendation for IPS deplyment? thanks

Tao

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