**To modify a traffic mirror session** The following ``modify-traffic-mirror-session`` example changes the traffic mirror session description and the number of packets to mirror. :: aws ec2 modify-traffic-mirror-session \ --description "Change packet length" \ --traffic-mirror-session-id tms-08a33b1214EXAMPLE \ --remove-fields "packet-length" Output:: { "TrafficMirrorSession": { "TrafficMirrorSessionId": "tms-08a33b1214EXAMPLE", "TrafficMirrorTargetId": "tmt-07f75d8feeEXAMPLE", "TrafficMirrorFilterId": "tmf-04812ff784EXAMPLE", "NetworkInterfaceId": "eni-070203f901EXAMPLE", "OwnerId": "111122223333", "SessionNumber": 1, "VirtualNetworkId": 7159709, "Description": "Change packet length", "Tags": [] } } For more information, see `Modify your traffic mirror session <https://docs.aws.amazon.com/vpc/latest/mirroring/traffic-mirroring-session.html#modify-traffic-mirroring-session>`__ in the *Traffic Mirroring Guide*.