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Local Content Filtering in Cisco IOS

Cisco IOS release 12.4(20)T introduced (web) content filtering. The feature is aimed primarily at the ISR routers which can connect to an external service hosted by Trend Micro, turning the mundane administrative task of blacklisting web sites into a subscription service.

You can use the same features without the Trend Micro service whenever you need a quick fix (for example, blocking a few web sites). The Local content filtering is also available on other platforms, not just on ISRs. Not surprisingly, the online IOS documentation on the local part of this feature is a bit sketchy, but you’ll find all the details you need to configure this feature in the Local Content Filtering article.

Read the full article in the CT3 wiki



  1. hi,

    any idea what's the limit of URL numbers I can enter ?
    eg: can I add 50 000 URLs ?



  2. No idea. Your Cisco SE should be able to help you get this information.


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Ivan Pepelnjak, CCIE#1354 Emeritus, is an independent network architect. He has been designing and implementing large-scale data communications networks as well as teaching and writing books about advanced technologies since 1990. See his full profile, contact him or follow @ioshints on Twitter.