This read-create value, when nonzero, redirects traffic matched by this QoS class map to a new egress physical port specified by the value itself. An admin uses this to reroute classified traffic, for example diagnostic or mirrored traffic, out a different physical port than it would normally egress. For example, setting this object to port 12 redirects all traffic matching this class map to egress via port 12 instead of its normal destination.