The source starting layer 4 port number that would be used to match an IP flow. The value of 0 means that all layer 4 information would be ignored when matching an IP flow. If this object has any value other than 0 then this rule takes precedence over any rule that specifies an individual physical input port, a VLAN or any incoming implicit 802.1p traffic class rule. Any attempt to write a rule that indicates a non-default value for this object together with an individual port value for extremeQosRuleInPort will be rejected by the agent. NOTE: For an ICMP rule that specifies an IP pattern, this object has a different meaning in that it specifies the ICMP Type and Code values, in the following manner: The value of the Type must be shifted to the left by 8 bits and logical ORed with the value of the Code. The result will be stored in this object. In this case, this object can only contain values between 0 and 65535 inclusive since the ICMP Type and Code values are limited between 0 and 255 each.