xStack
®
DGS-3600 Series Layer 3 Gigabit Ethernet Managed Switch
Port Mirroring
The Switch allows you to copy frames transmitted and received on a port and redirect the copies to another port. You can attach a
monitoring device 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
Administration > Port Mirroring
, as shown below.
Figure 6- 15. Port Mirroring window
To configure a mirror port:
1.
Select the
Source Port from where you want to copy frames and the Target Port, which receives the copies from the
source port.
2.
Select the Source Direction, Ingress, Egress, or Both and change the Status
drop-down menu to
Enabled
.
3.
Click
Apply
to let the changes take effect.
NOTE:
You cannot mirror a fast port onto a slower port. For example, if you try to mirror the
traffic from a 100 Mbps port onto a 10 Mbps port, this can cause throughput problems. The port
you are copying frames from should always support an equal or lower speed than the port to
which you are sending the copies. Also, 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.
NOTE:
When the device with the source port has been removed from a stack, the configuration
will be disabled temporarily until another device has been installed in its place. If configurations
are saved to NVR RAM during this period the configuration will be removed forever.
43
