I have 3750 series switches whic h modify the voip cos to cos 5, these act like a layer 2 devices. The switches are connected to ASA 5500 firewall and firewalls to WAN, How can i implement the layer 3 dscp marking on switches or firewalls? if i apply on the switches, will the firewall trust the marking or forward these with out it. Do the firewalls ASA 5510 supports the dscp marking of packets?
Your help will be higly appriciated on this matter.