The tNetworkEgressDSCPEntry defines a particular DSCP entry for a
network egress policy.
Some default entries are created by the agent for the default network
policy (1). These cannot be deleted or modified. Other entries are
created/deleted by user.
In the event that one policy has multiple entries, and
the tNetworkEgressDSCP values are the same, only one queue
will be created (the queue for the lexicographically
first tNetworkEgressDSCP).