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DES-3226 NWay Standalone Fast Ethernet Switch User’s Guide
2. Configure the Speed/Duplex setting for the port. Select Auto to allow the port to select the best
transmission speed, duplex mode and flow control settings based on the capabilities of the
device at the other end. The other selections allow you to force the port to operate in the
specified manner. Select 100M/FULL for port operation at 100 Mbps and full duplex. Select
100M/HALF for port operation at 100 Mbps and half duplex. Select 10M/FULL for port
operation at 10 Mbps and full duplex. Select 10M/HALF for port operation at 10 Mbps and half
duplex.
3. Click Apply to let your changes take effect.
Port Mirroring
Figure 7-5. Port Mirroring window
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.
To configure a mirror port, first select the Source Port from where you want to copy frames and the
Target Port, which receives the copies from the source port. This is the port where you will connect a
monitoring/troubleshooting device such as a sniffer or an RMON probe. Next, select the Source
Direction, Ingress, Egress, or Both, and change the Status pull-down menu to Enabled. Finally, click
Apply to let the changes take effect.
Note: You should not mirror a faster port or higher traffic ports to 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.
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