This notification-only enumerated value carried in packet-mirroring traps indicates whether the mirrored traffic direction is ingress(0) or egress(1). An admin reads this to know whether a mirroring session is capturing traffic coming into the router from the subscriber or going out to the subscriber, which matters for correctly interpreting captured lawful-intercept data. For example, juniPacketMirrorDirection=ingress(0) confirms a given mirroring session is capturing only the subscriber's outbound-to-network traffic, not traffic sent to them.