Datto Networking Appliance (DNA): Switches: Port Mirroring



This article describes how to configure port mirroring on Datto Switches.


  • Datto Switches


Port Mirroring is used to send copies of packets seen on one or more ports to another port of a switch. It is commonly used by network administrators to easily collect and analyze data on active networks, and then used to diagnose or debug issues.

All Datto Switches support port mirroring. You can have up to four active, concurrent mirroring sessions on any single switch, and can be used in conjunction with Link Aggregation to mirror traffic from a LAG into another port for analysis.



1. Navigate to a device web session for your switch.


2. Click Port Settings as seen in Figure 1.

Figure 1: Port Settings

Mirroring Ports

1. Select the source and destination ports by checking the boxes on the left most column of the specific ports, as seen in Figure 2.

Figure 2: Selecting ports

2. Click Mirror, as seen in Figure 3.

Figure 3: The Mirror Button

3. Select which port you want the traffic to be mirrored from by choosing it from the Destination ID drop down as seen in Figure 4. Other ports will automatically become sources.

Figure 4: Destination Port ID.

4. Specify, for each source port, whether it will transmit Tx only, Rx only, or both types of traffic as seen in Figure 5.

Figure 5: Source port IDs & transmission types

5. Click OK. Its respective mirror status will display in the Mirroring column on the Port Settings as seen in Figure 6. Each session will be color-coded.

Figure 6: Two mirroring sessions


Unmirroring Ports

1. Select the checkbox next to a mirror port as seen in Figure 7. You can select multiple ports at a time.

Figure 7: Selecting Ports

2. Click Unmirror, as seen in Figure 8.

Figure 8: The Unmirror button

 3. A dialog box will appear, as seen in Figure 9. Click OK.

Figure 9: Dialog prompt for removing ports

Important Notes

  • If you unmirror the destination port, the entire mirror session is torn down. 
  • If you unmirror any port in a two port mirror, the entire mirror session will be torn down.
  • You cannot mirror ports that are also being aggregated with each other.
  • You can mirror one or more ports of an aggregate into a port that is not part of an aggregate group.

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