The DSCP Policy to assign to packets received on
the specified Vlan. This is an index into the
hpSwitchCosDSCPPolicy table, or the value 255
indicating no DSCP Policy exists. This policy is
associated with an 802.1p priority value, which
will be inserted in the 802.1Q tag and will cause
the packet to be placed in the appropriate outbound
port queue. When the packet is IP protocol type,
the DSCP policy value (a Differentiated Services
codepoint) will also be written into the
Differentiated-Services field of the IP
Type-of-Service byte.