Specify which fields in the incoming packet might be trausted when the policy decision should be based in the incoming packet itself. Policy decision depend on the active policy list. In cases that there is no active policy list or that the result of the active policy list is Permit, then the outgoing packet prioirty may be based on the incoming packet instead of an the user specification. Trusting COS (802.1p) means that the outgoing packet prioirty (802.1p) should equal the incoming packet prioirty. Trusting DSCP means that the outgoing packet prioirty (802.1p) should be taken from ipPolicyDiffServTable using the incoming packet DSCP value. Trusting COS + DSCP means that both fields should be used. The behavior of the device when both COS + DSCP should be trusted is outside the scope of the current version of the MIB. (Note: P333R uses the max between incoming COS & DSCP-to-COS mapping) Some devices might support only a subset of the values.