User's Guide

© Copyright 2018 TRENDnet. All Rights Reserved.
TRENDnet User’s Guide
Managed Industrial L2 Switch
80
Internal Information
Port Priority
The port priority of the LACP member port.
Admin Key
The Admin key of the LACP member port.
Oper Key
The Oper key of the LACP member port.
Port State
The port state of the LACP member port.
Loop Detection
Loop detection is designed to handle loop problems on the edge of your network. This
can occur when a port is connected to a Switch that is in a loop state. Loop state occurs
as a result of human error. It happens when two ports on a switch are connected with
the same cable. When a switch in loop state sends out broadcast messages the
messages loop back to the switch and are re-broadcast again and again causing a
broadcast storm.
The loop detection function sends probe packets periodically to detect if the port
connect to a network in loop state. The Switch shuts down a port if the Switch detects
that probe packets loop back to the same port of the Switch.
Loop Recovery:
When the loop detection is enabled, the Switch will send one probe packets every two
seconds and then listen this packet. If it receives the packet at the same port, the
Switch will disable this port. After the time period, recovery time, the Switch will
enable this port and do loop detection again.
The Switch generates syslog, internal log messages as well as SNMP traps when it shuts
down a port via the loop detection feature.
Default Settings
The default global Loop-Detection state is disabled.
The default Loop Detection Destination MAC is 00:0b:04:AA:AA:AB
The default Port Loop-Detection state is disabled for all ports.
The default Port Loop-Detection status is unblocked for all ports.
The loop detection on the Switch is disabled.
Loop Detection Destination MAC=00:0b:04:aa:aa:ab
Recovery Recovery
Port State Status State Time Port State Status State Time
---- -------- ------- -------- ---- ---- -------- ------- -------- ----
1 Disabled Normal Enabled 1 2 Disabled Normal Enabled 1
3 Disabled Normal Enabled 1 4 Disabled Normal Enabled 1
5 Disabled Normal Enabled 1 6 Disabled Normal Enabled 1
7 Disabled Normal Enabled 1 8 Disabled Normal Enabled 1
9 Disabled Normal Enabled 1 10 Disabled Normal Enabled 1
11 Disabled Normal Enabled 1 12 Disabled Normal Enabled 1
13 Disabled Normal Enabled 1 14 Disabled Normal Enabled 1
15 Disabled Normal Enabled 1 16 Disabled Normal Enabled 1
CLI Configuration
Node
Command
Description
enable
show loop-detection
This command displays the current
loop detection configurations.
configure
loop-detection (disable | enable)
This command disables / enables
the loop detection on the switch.
configure
loop-detection address
MACADDR
This command configures the
destination MAC for the loop
detection special packets.