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.