Port Mirroring - D-Link xStack DGS-3324SRi User Manual

xStack DGS/DXS-3300 Series Layer 3 Stackable Gigabit Ethernet Switch User Manual

Port Mirroring

The Switch allows frames to be copied transmitted and received on a port and redirect the copies to another port. A
monitoring device may be attached to the mirrored port, such as a sniffer or an RMON probe, to view details about the
packets passing through the first port. This is useful for network monitoring and troubleshooting purposes. To view the
Port Mirroring window, click Port Mirroring in the Configuration folder.
To configure a mirror port:
Select the Source Port from where to copy frames and the Target Port, which receives the copies from the
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source port.
Select the Source Direction, Ingress, Egress, or Both and change the Status drop-down menu to Enabled.
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Click Apply to let the changes take effect.
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Figure 6- 7. Port Mirroring window
NOTE: A fast port cannot be mirrored onto a slower port. For example, if
the user tries to mirror the traffic from a 100 Mbps port onto a 10 Mbps
port, this can cause throughput problems. The port copying frames should
always support an equal or lower speed than the port to which the copies
are being sent. In addition, the target port for the mirroring cannot be a
member of a trunk group. Please note a target port and a source port
cannot be the same port.
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