The Subscription-based Cisco IOS Content Filtering feature interacts with the Trend Micro URL filtering service so that HTTP requests can be allowed or blocked, and logged, based on a content filtering policy. The content filtering policy specifies how to handle items such as web categories, reputations (or security ratings), trusted domains, untrusted domains, and keywords. URLs are cached on the router, so that subsequent requests for the same URL do not require a lookup request, thus improving performance.
Support for third-party URL filtering servers SmartFilter (previously N2H2) and Websense, which was introduced with Cisco IOS Release 12.2(11)YU and integrated into Cisco IOS Release 12.2(15)T, continues to be available.
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