the mls qos trust device cisco-phone
called conditional trust
which trust cos marking coming from cisco ip phon and oevwridde enything else to cos 0 like traffic coming from attached PC
it is part of trusting
while
priority-queue is part of the port sechdualing technology each one work independantly u can have trust and no priority-queue
but they cooperate if they both exist
the trust take the marking and the priority-queue give the cos 5 markd traffic priority
if helpful Rate
