# CoPP (Control Plane Policing)

**URL:** <https://forum.networklessons.com/t/copp-control-plane-policing/4602>\
**Category:** Lessons Discussion\
**Created:** [August 13, 2018, 1:09pm UTC](https://forum.networklessons.com/t/copp-control-plane-policing/4602 "2018-08-13T13:09:40Z")\
**Posts on this page:** 1\
**Showing post:** 4

<div class="post-metadata">

**Author:** ![Garoun11](https://cdn-forum.networklessons.com/letter_avatar_proxy/v4/letter/g/258eb7/32.png) [@Garoun11](https://forum.networklessons.com/u/Garoun11)\
**Post date:** [August 19, 2018, 11:38am UTC](https://forum.networklessons.com/t/copp-control-plane-policing/4602/4 "2018-08-19T11:38:24Z")

</div>

Hello

Thank you for the explanation.

I was reading about CoPP and I read on a forum an example on why to use it.

It was mentioned that if for example you want to filter traffic to an outside interface with an access list , and someone manage to send a lot of traffic to that interface , even though the traffic will be dropped as it matches the drop action in the access list ,this will have an impact on CPU .

On the other hand with CoPP you will have a silent drop meaning packets will never reach CPU .

In this example applying an access list to an interface for this purpose isn’t the same as CoPP ?

Or it is correct as an example?

Moreover ,do Access lists sent traffic to CPU while receive Access Lists don’t ?

Thanks again

Kostas

---

_[View the full topic](https://forum.networklessons.com/t/copp-control-plane-policing/4602)._