TP-LINK TL-SG5428 User's Guide Page 47

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Select: Select the desired port for loop
back detection configuration. It is
multi-optional.
Port: Displays the port number.
Status: Enable or disable loopback detection function for the port.
Operation Mode: Select the operation mode when a Loopback is detected.
Alert: When a Loopback is detected, display an alert.
Port based: When a Loopback is detected, display an alert
and block the port.
Recovery Mode: Select the mode how the blocked port recovers to normal status.
Auto: Block status can be automatically removed after
recovery time.
Manual: Block status only can be removed manually.
Loop Status: Displays the port status whether a Loopback is detected.
Block Status: Displays the port status about block or unblock.
LAG: Displays the LAG number the port belongs to.
Manual Recover: Manually remove the block status of selected ports.
Note:
1. Recovery Mode is not selectable when Alert is chosen in Operation Mode.
2. Loopback Detection must coordinate with storm control.
5.2 LAG
LAG (Link Aggregation Group) is to combine a number of ports together to make a single
high-bandwidth data path, so as to implement the traffic load sharing among the member ports in
the group and to enhance the connection reliability.
For the member ports in an aggregation group, their basic configuration must be the same. The
basic configuration includes STP, QoS, GVRP, VLAN, port attributes, MAC Address Learning
mode and other associated settings. The further explains are following:
If the ports, which are enabled for the GVRP, 802.1Q VLAN, Voice VLAN, STP, QoS, Port
Isolation, DHCP Snooping and Port Configuration (Speed and Duplex, Flow Control),
are in a LAG, their configurations should be the same.
The ports, which are enabled for the Port Security, Port Mirror, MAC Address Filtering,
Static MAC Address Binding, 802.1X Authentication and IP Source Guard, can not be
added to the LAG.
It’s not suggested to add the ports with ARP Inspection and DoS Defend enabled to the
LAG.
If the LAG is needed, you are suggested to configure the LAG function here before configuring the
other functions for the member ports.
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