Something you need to be aware of is that as soon as you enable QoS on your switch, it will erase the marking of all packets that are received! If you don’t want this to happen, you can use the following command:
Above you can see that we don’t trust anything at the moment. This is the default on Cisco switches. We can trust packets based on the DSCP value, frames on the CoS value, or we can trust the IP phone.
imply said this basically means on which device are we going to trust the marking of the packets and Ethernet frames entering our network.
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