AWS CloudFormation
User Guide (Version )

AWS::EC2::TrafficMirrorSession

Creates a Traffic Mirror session.

A Traffic Mirror session actively copies packets from a Traffic Mirror source to a Traffic Mirror target. Create a filter, and then assign it to the session to define a subset of the traffic to mirror, for example all TCP traffic.

The Traffic Mirror source and the Traffic Mirror target (monitoring appliances) can be in the same VPC, or in a different VPC connected via VPC peering or a transit gateway.

By default, no traffic is mirrored. Use AWS::EC2::TrafficMirrorFilterRule to specify filter rules that specify the traffic to mirror.

Syntax

To declare this entity in your AWS CloudFormation template, use the following syntax:

JSON

{ "Type" : "AWS::EC2::TrafficMirrorSession", "Properties" : { "Description" : String, "NetworkInterfaceId" : String, "PacketLength" : Integer, "SessionNumber" : Integer, "Tags" : [ Tag, ... ], "TrafficMirrorFilterId" : String, "TrafficMirrorTargetId" : String, "VirtualNetworkId" : Integer } }

YAML

Type: AWS::EC2::TrafficMirrorSession Properties: Description: String NetworkInterfaceId: String PacketLength: Integer SessionNumber: Integer Tags: - Tag TrafficMirrorFilterId: String TrafficMirrorTargetId: String VirtualNetworkId: Integer

Properties

Description

The description of the Traffic Mirror session.

Required: No

Type: String

Update requires: No interruption

NetworkInterfaceId

The ID of the source network interface.

Required: Yes

Type: String

Update requires: Replacement

PacketLength

The number of bytes in each packet to mirror. These are bytes after the VXLAN header. Do not specify this parameter when you want to mirror the entire packet. To mirror a subset of the packet, set this to the length (in bytes) that you want to mirror. For example, if you set this value to 100, then the first 100 bytes that meet the filter criteria are copied to the target.

If you do not want to mirror the entire packet, use the PacketLength parameter to specify the number of bytes in each packet to mirror.

Required: No

Type: Integer

Update requires: No interruption

SessionNumber

The session number determines the order in which sessions are evaluated when an interface is used by multiple sessions. The first session with a matching filter is the one that mirrors the packets.

Valid values are 1-32766.

Required: Yes

Type: Integer

Update requires: No interruption

Tags

The tags to assign to a Traffic Mirror session.

Required: No

Type: List of Tag

Update requires: No interruption

TrafficMirrorFilterId

The ID of the Traffic Mirror filter.

Required: Yes

Type: String

Update requires: No interruption

TrafficMirrorTargetId

The ID of the Traffic Mirror target.

Required: Yes

Type: String

Update requires: No interruption

VirtualNetworkId

The VXLAN ID for the Traffic Mirror session. For more information about the VXLAN protocol, see RFC 7348. If you do not specify a VirtualNetworkId, an account-wide unique id is chosen at random.

Required: No

Type: Integer

Update requires: No interruption

Return Values

Ref

When you pass the logical ID of this resource to the intrinsic Ref function, Ref returns the ID of the Traffic Mirror Session.

For more information about using the Ref function, see Ref.

Examples

Create a Traffic Mirror Session

This is a traffic mirror session that mirrors the first 100 bytes in each packet.

JSON

{ "SampleTrafficMirrorSession": { "Type": "AWS::EC2::TrafficMirrorSession", "Properties": { "Description": "Example traffic mirror session", "NetworkInterfaceId": "eni-070203a001EXAMPLE", "TrafficMirrorTargetId": "tmt-5319fsEXAMPLE", "TrafficMirrorFilterId": "tmf-1tdbhqEXAMPLE", "SessionNumber": 1, "PacketLength": 100, "VirtualNetworkId": 1234, "Tags": [ { "Key": "Name", "Value": "SampleSession" } ] } } }

YAML

SampleTrafficMirrorSession: Type: "AWS::EC2::TrafficMirrorSession" Properties: Description: "Example traffic mirror session" NetworkInterfaceId: "eni-070203a001EXAMPLE" TrafficMirrorTargetId: "tmt-5319fsEXAMPLE" TrafficMirrorFilterId: "tmf-1tdbhqEXAMPLE" SessionNumber: 1 PacketLength: 100 VirtualNetworkId: 1234 Tags: - Key: "Name" Value: "SampleSession"

See Also