L2 Features > Port Mirroring; L2 Features > Loopback Detection - D-Link EasySmart DES-1100-16 Manual

If the IGMP server is not able to send out query control message automatically, a static router port may be
required to be configured manually. Select the ports to be assigned as router ports for IGMP snooping in the
IGMP Static Router Port List, and click Apply for changes to take effect.
L2 Features > Port Mirroring
Port Mirroring is a method of monitoring network traffic that forwards a copy of each incoming and/or
outgoing packet from one port of the Switch to another port where the packet can be studied. This enables
network managers to better monitor network performances.
Selection Sniffer Mode for the Source Ports are as follows:
TX (transmit) mode: Duplicates the data transmitted from the source port and forwards it to the Target Port.
Click "all" to include all ports into port mirroring.
RX (receive) mode: Duplicates the data that received from the source port and forwards it to the Target Port.
Click "all" to include all ports into port mirroring.
Both (transmit and receive) mode: Duplicate both the data transmitted from and data sent to the source
port, and forwards all the data to the assigned Target Port. Click "all" to include all ports into port mirroring.
L2 Features > Loopback Detection
The Loopback Detection function is used to detect the loop created by a specific port while Spanning Tree
Protocol (STP) is not enabled in the network, especially when the down links are hubs or unmanaged
Figure 41 – L2 Features > IGMP Snooping setting
Figure 42 –L2 Features > Port Mirroring
NOTE: The target ports will stop mirroring packets
if there are unknown tags or destination packets
sent out by source ports.
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