The passed packets count.
If the ingress interface index is 2147483647, this node will be the count of passed packets of the specified queue of the ingress interface.
If the egress interface index is 2147483647, this node will be the count of passed packets of the specified queue of the ingress interface.
If none of the ingress and egress interface is 2147483647, this node will be the count of passed packets which is from the ingress interface to
the egress interface at the specified queue.
The ingress interface index and the egress interface index can not be 2147483647 at the same time .