Difference of filtering routes between using interface and control-plane

[yangfrank]

Hi All

Any one can give me suggestion to understand the difference of filtering routes between using interface and control-plane?

I read the document, please see the link http://www.ciscozine.com/copp-what-is-that/

We also can use ACL and attach it in interface to filter routes, why we use control-plane ? Thank you !

[Jon Marshall]

Two completely different things.

CoPP is used to protect the control plane of a device and make sure it does not become overloaded if a lot of packets are sent to the device's IP address.

You can use it to prioritise certain traffic such as routing updates and give a low priority to other packets.

It is not used to filter routing updates.

Jon

[Joseph W. Doherty]

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Besides the logical difference, as already described by Jon, on switches, interface filtering might be programed into the ASICs while CoPP filtering might not be.