This object controls whether mirrored copies of egress-port traffic are an exact, true replica of what actually leaves the wire, or a normal copy that may omit certain modifications the switch applies only during egress processing. An admin sets true-egress-mirroring when they need bit-for-bit accurate captures for troubleshooting or compliance, accepting the extra processing cost, and normal-egress-mirroring when a lighter-weight approximate copy is good enough. For example, leaving tMirrorSourcePortEgressMirroringType at its default of true-egress-mirroring(1) ensures packets seen at the mirror destination match exactly what was transmitted out the monitored port.