Black Box Managed Gigabit Switch, LGB1126A, LGB1148A, LGB1108A manual Mirroring

Chapter 3: Configuration

3.20 Mirroring

You can mirror traffic from any source port to a target port for real-time analysis. You can then attach a logic analyzer or RMON probe to the target port and study the traffic crossing the source port in a completely unobtrusive manner. The Mirror Configuration enables you to monitor the traffic of the network. For example, we assume that Port A and Port B are Monitoring Port and Monitored Port respectively, thus, the traffic received by Port B will be copied to Port A for monitoring.

Web Interface

To configure the Mirror in the Web interface:

1.Click Configuration, Mirroring.

2.Scroll to select “Port to mirror on“ for the port you’d like to select.

3.Scroll to disabled, enable, TX Only, and RX Only to set the Port Mirror mode.

4.Click Save to save the setting.

5.Click Revert to undo any changes made locally and revert to previously saved values.

Figure 3-91. The Mirror Configuration screen.

Parameter Description

•Port to mirror on: Port to mirror also known as the mirror port. Frames from ports that have either source (Rx) or destination (Tx) mirroring enabled are mirrored on this port. Disabled disables mirroring.

Mirror Port Configuration: The following are used for Rx and Tx enabling.

•Port: The logical port for the settings contained in the same row.

•Mode: Select mirror mode:

-Rx only Frames received on this port are mirrored on the mirror port. Frames transmitted are not mirrored.

-Tx only Frames transmitted on this port are mirrored on the mirror port. Frames received are not mirrored.

-Disabled: Neither frames transmitted nor frames received are mirrored.

-Enabled: Frames received and frames transmitted are mirrored on the mirror port.

NOTE: For a given port, a frame is only transmitted once. It is therefore not possible to mirror Tx frames on the mirror port. Because of this, mode for the selected mirror port is limited to Disabled or Rx only.

•Buttons: Click “Save“ to save changes, or “Reset“ to undo any changes made locally and revert to previously saved values.

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