Panasonic Switch-M8ePWR PN27089KA User manual

Thank you for purchasing our product.
This manual provides important information about safe and proper operations
of this Switching Hub.

Please read the "Important Safety Instructions" on pages 2 to 4.
Any problems or damage resulting from disassembly of this Switching Hub by
customers are not covered by the warranty.
Switch-M8ePWR
Model Number: PN27089KA
Operation Manual
For Menu Screens

2
Important Safety Instructions
This chapter contains important safety instructions for preventing bodily
injury and/or property damage. You are required to follow them.
Severity of bodily injury and/or property damage, which could result
from incorrect use of the Switching Hub, are explained below.
The following symbols are used to classify and describe the type of
instructions to be observed.
This symbol is used to alert users
to what they must not do.

Do not use power other than AC 100 - 240V.
Deviation could lead to fire, electric shock, and/or equipment failure.

Do not handle the power cord with wet hand.
Deviation could lead to electric shock and/or equipment failure.

Do not handle this Switching Hub and connection cables during a
thunderstorm.
Deviation could lead to electric shock.

Do not disassemble and/or modify this Switching Hub.
Deviation could lead to fire, electric shock, and/or equipment failure.

Do not damage the power cord. Do not bend too tightly, stretch, twist,
bundle with other cord, pinch, put under a heavy object, and/or heat it.
Damaged the cord could lead to fire, short, and/or electric shock.

Do not put foreign objects (such as metal and combustible) into the opening
(such as twisted pair port, console port, SFP extension slot), and/or do not
drop them into the inside of the Switching Hub.
Deviation could lead to fire, electric shock, and/or equipment failure.

Do not connect equipments other than 10BASE-T/100BASE-TX/1000BASE-T
to twisted pair port.
Deviation could lead to fire, electric shock, and/or equipment failure.

Do not place this Switching Hub in harsh environment (such as near water,
high humid, and/or high dust).
Deviation could lead to fire, electric shock, and/or equipment failure.

Do not place this Switching Hub under direct sunlight and/or high
temperature.
Deviation could lead to high internal temperature and fire.
WARNING
This symbol indicates safety instructions. Deviation
from these instructions could lead to bodily injury
and/or property damage.
This symbol is used to alert
users to what they must do.
WARNING
This symbol indicates a potential hazard that could
result in serious injury or death.
CAUTION

3

Do not install this Switching Hub at the location with continuous vibration or
strong shock, or at the unstable location
Deviation could lead to injury and/or equipment failure.

Do not install any module other than our optional SFP module to SFP
extension slot.
Deviation could lead to fire, electric shock, and/or equipment failure.

Do not connect any cable other than our optional console cable.
Deviation could lead to fire, electric shock, and/or equipment failure.

Do not put this Switching Hub into fire.
Deviation could lead to explosion and/or fire.

Do not use the supplied power cord for anything other than this product
.
Deviation could lead to fire, electric shock, and/or equipment failure.

Use the bundled power cord (AC 100 –240V specifications).
Deviation could lead to electric shock, malfunction, and/or equipment
failure.
The warranty does not cover any problems resulting from the use of any
power cord other than the one supplied.

Unplug the power cord in case of equipment failure.
Deviation such as keeping connected for a long time, could lead to fire.

Connect this Switching Hub to ground.
Deviation could lead to electric shock, malfunction, and/or equipment
failure.

Connect the power cord firmly to the power port.
Deviation could lead to electric fire, shock, and/or malfunction.

Unplug the power cord if the Status/ECO LED (Status/ECO mode), TEMP LED
(temperature sensor), or FAN LED (fan sensor) blinks in orange (system fault).
Deviation, such as keeping connected for a long time, could lead to fire.

When this Switching Hub is installed on wall surface, mount it firmly so as not
to drop dwon because of weight of the main body and connection cable.
Deviation could lead to injury and/or equipment failure.

Up to two Switching Hubs can be connected by using the connection brackets
and connection bracket screws included with the optional PN71052 19-inch
rack mount brackets (for two units). Attach the connection brackets to the
connection bracket screw holes on the front and back panels to securely fix
the Switching Hubs before installation.
If the Switching Hubs are not fixed securely, they may fall, leading to injury
and/or equipment failure.
WARNING
WARNING

4
CAUTION

Handle the Switching Hub carefully so that fingers or hands may not be
damaged by twisted pair port, SFP extension slot, console port, or power
cord hook block.
If you connect a network camera, a wireless access point, or other devices that
can be affected by a lightning strike (in particular, devices installed outdoors) to
the twisted pair port of this Switching Hub, a lightning surge current/voltage
may be conducted to this Switching Hub through the twisted pair cable, leading
to malfunction. If you connect such a device, it is strongly recommended that you
install a surge protective device (SPD) on the twisted pair port side of this
Switching Hub.
A lightning surge current/voltage may be conducted to this Switching Hub
through the power supply or ground wire connected to the power port, leading
to malfunction. If a lightning surge current/voltage may flow in through the
power supply or ground wire, it is recommended that you install a surge
protective device (SPD) on the power port side of this Switching Hub.
Important Requests on Protection from Lightning Strike

5
Basic Instructions for the Use of This Product
For inspection and/or repair, consult the retailer.
Use commercial power supply from a wall socket, which is close and easily accessible
to this Switching Hub.
Unplug the power cord when installing or moving this Switching Hub.
Unplug the power cord when cleaning this Switching Hub.
Use this Switching Hub within the specifications. Deviation could lead to malfunction.
When installing this Switching Hub using rubber feet (with built-in magnets), confirm
that it does not move or fall down due to weight of cables.
When connecting a cable, hold the Switching Hub firmly.
If you install this Switching Hub at a high place, securely fix it on the wall with screws.
If you install this Switching Hub at a high place with magnets alone, it may fall,
leading to injury or failure of this Switching Hub.
Do not put a floppy disk or a magnetic card near the rubber feet (with built-in
magnets). Otherwise, recorded content may be lost.
After installing this Switching Hub on an OA desk, do not move either without
dismounting it. Otherwise, the desk surface may be damaged.
Do not touch the metal terminal of the RJ45 connector, the modular plug of
connected twisted pair cable. Do not place charged objects in the proximity of them.
Static electricity could lead to equipment failure.
Do not put the modular plug of the connected twisted pair cable on objects that can
carry static charge, such as carpet. Do not place it in the proximity. Static electricity
could lead to equipment failure.
Do not put a strong shock, including dropping, to this Switching Hub. Deviation could
lead to equipment failure.
Before connecting a console cable to the console port, discharge static electricity, for
example by touching metal appliance (do not discharge by touching this Switching
Hub).
Do not store and/or use this Switching Hub in the environment with the
characteristics listed below.
(Store and/or use this Switching Hub in the environment in accordance with the
specification.)
- High humidity. Possible spilled liquid (water).
- Dusty. Possible static charge (such as carpet).
- Under direct sunlight.
- Possible condensation. High/low temperature exceeding the specifications
environment.
- Strong vibration and/or strong shock.
Please use this Switching Hub in places where the ambient temperature is in the
range from 0 to 40 degrees C. You can use it in places where the ambient
temperature is in the range from 0 to 50 degrees C if you set the fan speed to High or

6
Middle and control the total power supply to 62 W or below.
Failure to meet the above conditions may result in fire, electric shock, breakdown,
and/or malfunction. Please take notice because such cases are out of guarantee.
Additionally, do not cover the bent hole of this Switching Hub.
Deviation could lead to high internal temperature, equipment failure and/or
malfunction.
When using two Switching Hubs, do not stack them. When you place them side by
side, allow for a space of 20 mm or more between them. This space is not necessary if
you use PN71052 connection brackets.
When stacking Switching Hubs, leave a minimum of 20 mm space between them.
1. Panasonic will not be liable for any damage resulting from the operation not in
accordance with this document or the loss of communications, which may or may
not be caused by failure and/or malfunction of this device.
2. The contents described in this document may be changed without prior notice.
3. For any question, please contact the retailer where you purchased the product.
* Brands and product names in this document are trademarks or registered trademarks
of their respective holders.

7
Table of Contents
Basic Instructions for the Use of This Product.................................................... 5
1. Product Outline ......................................................................................... 11
1.1. Features............................................................................................... 11
1.2. Accessories .......................................................................................... 13
1.3. Optional Accessories ............................................................................ 13
1.4. Part Names and Functions .................................................................... 14
1.5. LED Behavior........................................................................................ 17
1.5.1. LED Behavior at Starting-up ............................................................ 17
1.5.2. LED Behavior while Operating ......................................................... 17
1.5.3. Loop Detection Function ................................................................. 20
1.5.4. Operation Overview of PoE Power Supply Function ......................... 21
1.6. LED DISPLAY CHANGE BUTTON ........................................................... 22
1.6.1. LED Base Mode Configuration......................................................... 22
1.6.2. LED Display Change ........................................................................ 22
2. Installation................................................................................................. 23
2.1. Mounting to Steel Product ................................................................... 23
2.2. Mounting to Rack (Option)................................................................... 24
2.3. Mounting to Wall (Option) ................................................................... 26
3. Connection................................................................................................ 27
3.1. Connecting a Twisted Pair Port ............................................................. 27
3.2. Connecting a SFP Extension Slot ........................................................... 28
3.3. Connecting to Power............................................................................ 29
4. Configuration ............................................................................................ 30
4.1. Connecting via Console Port................................................................. 30
4.2. Login ................................................................................................... 31
4.3. Basic Operations on the Screen ............................................................ 34

8
4.4. Main Menu .......................................................................................... 36
4.5. General Information Menu ................................................................... 37
4.6. Basic Switch Configuration ................................................................... 39
4.6.1. System Administration Configuration .............................................. 40
4.6.2. System IP Address Configuration..................................................... 41
4.6.3. SNMP Configuration....................................................................... 43
4.6.3.a. SNMP Management Configuration............................................ 44
4.6.3.b. SNMP Trap Receiver Configuration ............................................ 46
4.6.3.c. Enable/Disable Individual Trap Menu ......................................... 48
4.6.4. Port Configuration Basic ................................................................. 51
4.6.5. Port Configuration Extend............................................................... 54
4.6.6. Port Configuration Power Saving .................................................... 56
4.6.7. System Security Configuration ........................................................ 58
4.6.7.a. Telnet Access Limitation Configuration ...................................... 62
4.6.7.b. RADIUS Configuration............................................................... 64
4.6.7.c. Syslog Transmission Configuration ............................................. 66
4.6.7.d. SSH Server Configuration .......................................................... 68
4.6.7.e. LED Base Mode Configuration ................................................... 70
4.6.8. Forwarding Database...................................................................... 72
4.6.8.a. Adding or deleting MAC address ............................................... 73
4.6.8.b. Setting learning mode of MAC address...................................... 75
4.6.8.c. Displaying MAC address table by port ........................................ 76
4.6.8.d. Displaying all MAC addresses .................................................... 78
4.6.8.e. Displaying MAC address table by VLAN...................................... 79
4.6.9. SNTP Configuration ........................................................................ 81
4.6.10. ARP Table Configuration............................................................... 83
4.7. Advanced Switch Configuration............................................................ 85
4.7.1. VLAN Management ........................................................................ 87
4.7.1.a. VLAN Features .......................................................................... 87
4.7.1.b. VLAN Management Menu......................................................... 88
4.7.1.c. VLAN Creation Menu................................................................. 92
4.7.1.d. VLAN Modification Menu .......................................................... 94
4.7.1.e. VLAN Port Configuration Menu ................................................. 96
4.7.2. Link Aggregation ............................................................................ 98
4.7.2.a. About Link aggregation............................................................. 98

9
4.7.2.b. Trunk Configuration Menu ........................................................ 99
4.7.2.c. Set Port Priority for LACP ......................................................... 102
4.7.2.d. LACP Group Status.................................................................. 104
4.7.3. Port Monitoring Configuration...................................................... 106
4.7.4. Rapid Spanning Tree Configuration............................................... 108
4.7.4.a. Basic Port Configuration .......................................................... 112
4.7.4.b. Advanced Port Configuration .................................................. 114
4.7.4.c. Designated Topology Information............................................ 117
4.7.5. Quality of Service Configuration.................................................... 118
4.7.5.a. Traffic Class Configuration Menu............................................. 119
4.7.5.b. Scheduling Method................................................................. 121
4.7.5.c. DiffServ Configuration Menu ................................................... 123
4.7.6. Storm Control Configuration Menu............................................... 125
4.7.7. Port Based Access Control Configuration Menu............................. 127
4.7.8. IGMP Snooping Configuration ...................................................... 130
4.7.8.a. Set Leave Mode Menu............................................................. 133
4.7.8.b. VLAN Filter Configuration........................................................ 135
4.7.8.c. Router Port Table Configuration............................................... 136
4.7.9. Power Over Ethernet Configuration............................................... 138
4.7.9.a. PoE Port Configuration Menu .................................................. 139
4.7.9.b. PoE Global Configuration Menu .............................................. 141
4.7.10. Ring Redundant Protocol Configuration ...................................... 143
4.7.10.a. RRP Domain Creation Menu .................................................. 146
4.7.10.b. RRP Domain Modification Menu............................................ 149
4.7.10.c. RRP Domain information Menu.............................................. 152
4.7.11. Loop Detection Configuration Menu ........................................... 154
4.7.11.a. Loop History Information....................................................... 157
4.8. Statistics ............................................................................................ 159
4.9. Switch Tools Configuration................................................................. 164
4.9.1. TFTP Software Upgrade ................................................................ 165
4.9.2. Configuration File Upload/Download ............................................ 168
4.9.3. System Reboot ............................................................................. 170
4.9.4. Exception Handler......................................................................... 172
4.9.5. Ping Execution.............................................................................. 174
4.9.6. System Log................................................................................... 176

10
4.9.7. Watch Dog Timer Menu................................................................ 179
4.10. Save Configuration to Flash .............................................................. 180
4.11. Command Line Interface (CLI) .......................................................... 182
4.12. Logout............................................................................................. 183
Appendix A. Specifications........................................................................... 184
Appendix B. Procedures for Console Port Configuration Using Windows
HyperTerminal ............................................................................................. 187
Appendix C. Easy IP Address Setup Function................................................. 188
Appendix D. Example of Network Configuration using Loop Detection Function
and Its Precautions ...................................................................................... 189
Troubleshooting .......................................................................................... 191
After-sales Service........................................................................................ 193

11
1
1. . P Pr ro od du uc ct t O Ou ut tl li in ne e
Switch-M8ePWR is a Layer-2 Ethernet Switching Hub with management function
having 8 ports of 10BASE-T/100BASE-TX supporting IEEE802.3af PoE power
supply function, and 2 ports of 10BASE-T/100BASE-TX/1000BASE-T and SFP
extension slot, one of which is selectable. All are twisted pair ports corresponding
to auto negotiation.
1.1. Features
This Switching Hub can supply power conforming with IEEE802.3af. Supplying
power up to 15.4 W per port, and up to 124 W in total is possible.
Ports 1 to 8 are set at MDI-X (default) to prevent a loop failure.
The loop detection function can prevent a loop failure by automatically
blocking a port when a loop occurs.
The Loop History function allows to identify the port by referring to the loop
event notification on the LED and the occurrence history on the configuration
screen.
The ECO mode LED function can save more power consumption by turning off
the LEDs on the Switching Hub.
All twisted pair ports support the straight/cross cable auto sensing function.
Simply connect devices with straight cables, whether it is a terminal or a
network device. (This function does not work if the port communication
configuration is set at fixed. Ports 1 to 8 are set at MDI-X. (default))
Ports 1 to 8 are 10/100BASE-TX ports corresponding to auto negotiation.
Ports 9 and 10 can be used as a 10/100/1000BASE-T port corresponding to
auto negotiation or an SFP extension slot exclusively. The speed and
communication mode can be set at fixed.
The MNO series power saving mode detects the connection status
automatically and saves power consumption to minimum.
Telnet/SSH functions allow remote configuration changes and verifications of
the Switching Hub.
Remotely configure the PoE settings for each port (Ports 1 to 8).
The Ping command can be used to verify communications.
The standard MIB (MIB II) is supported, allowing to manage the Switching

12
Hub from the SNMP manager. (For details, refer to Appendix A.)
Spanning Tree Protocol is supported, allowing to build a redundant system.
Ring Protocol is supported, allowing to build a redundant system in ring
configuration.
VLAN function allows free grouping of up to 256 VLANs.
The IEEE802.3ad Link Aggregation is supported, allowing to aggregate up to 8
ports.
The IEEE802.1p QoS function is supported.
The IEEE802.1X user authentication function (EAP-MD5/TLS/PEAP) is
supported.
The IGMP Snooping function is supported, allowing to prevent multicast
packets from monopolizing bandwidth.
The Reboot timer function is supported, allowing to automatically reboot the
switch after the specified time (within 24 hours).
The Internet Mansion function is supported, allowing to ensure the security of
each room.

13
1
1. .2 2. . A Ac cc ce es ss so or ri ie es s
Please be sure to confirm the content. Please contact our distributor if any of the
contents are insufficient.
Quantity
Installation Guide 1
CD-ROM (PDF version of Operating Instuctions) 1
Rubber foot (magnet built-in) 4
Screws (for fixing rubber foot) 4
Power cord (CEE7/7)(*) 1
* The attached power cord is dedicated for AC 100 - 240 V use.
1
1. .3 3. . O Op pt ti io on na al l A Ac cc ce es ss so or ri ie es s
PN71051
19-inch rack mount brackets (for 1 unit): 2 pcs/set
PN71052
19-inch rack mount brackets (for 2 units): 2 pcs + 2 connection
brackets/set
PN71053
Wall mount brackets: 2 pcs/set
PN72001
RJ45 D-sub 9 pin console cable
PN54021K
1000BASE-SX SFP module
PN54023K
1000BASE-LX SFP module

14
1
1. .4 4. . P Pa ar rt t N Na am me es s a an nd d F Fu un nc ct ti io on ns s
Fig. 1-4 Part names
Magnified
Front
panel
Back
panel
Status/ECO mode LED
PoE mode LED
GIGA mode LED
Speed mode LED
Duplex mode LED
Loop History mode LED
Power LED
Collision LED
PoE limit LED
Temperature sensor LED
Fan sensor LED
LED DISPLAY CHANGE
BUTTON
PoE power supply supported
10/100BASE-TX port 10/100/1000BASE-T port
Power port
Power cord hook block
MAC address label
Serial number label
SFP extension slot
Console port

15
Power port
Connect the supplied power cord into the port and connect the other end into
an electric outlet.
Power cord hook block
Hooking the supplied power cord on the block makes the cord less likely to be
unplugged from the power port.
MAC address label
Displays the MAC address of this Switching Hub.
Serial number label
Displays the serial number of this Switching Hub.
PoE power supply supported 10/100BASE-TX port (Ports 1 to 8)
Supports IEEE802.3af PoE power supply. Connection with 10/100BASE-TX
terminal, hub, repeater, bridge, and switching hub is possible.
The length of the twisted pair cable connecting this Switching Hub and a
device must be 100 m or shorter.
10/100BASE-TX port LEDs (Ports 9 to 10)
The length of the twisted pair cable connecting this Switching Hub and a
device must be 100 m or shorter.
SFP extension slots (Ports 9 to 10, Select either of 10/100/1000BASE-T port or
SFP for use)
The supported SFP modules (sold separately) can be attached to the slots.
Console port
Used to connect a VT100 compatible terminal to configure and manage this
Switching Hub.
Transmission mode: RS-232C Emulation mode: VT100
Transmission speed: 9600 bps Data length: 8 bits
Stop bit: 1 bit Parity control: None
Flow control: None Communication connector: RJ45

16
Use our optional RJ45 D-sub 9 pin console cable (PN72001) for connection.
LED display change button
Used to change the LED display mode settings. For detailed display
information and behavior on each LED display mode, refer to 1.5.
The button operation also allows to configure the LED base mode and loop
detection function (Enable/Disable).
Operation Description
Press-and-hold
for more than
3 seconds
Changes the LED base mode settings. When the LED display button is
pressed and held for more than 3 seconds, all of the STATUS/ECO, PoE,
GIGA, 100M and FULL LEDs are lit. Release the button to enter the mode
after switching. For detailed behavior on each LED base mode, refer to
1.6.1.
The factory default setting of the LED base mode is Status mode.
Press-and-hold
for more than
10 seconds
Changes the loop detection status (Enable/Disable). If the LED display
change button is pressed and held for more than 10 seconds, the LOOP
HISTORY LED are lit. Release the button to complete the settings. For
detailed behavior on the loop detection function settings, refer to 1.5.3.
The factory default setting of the loop detection function is enable.

17
1
1. .5 5. .
LED Behavior
1
1. .5 5. .1 1. . L LE ED D B Be eh ha av vi io or r a at t S St ta ar rt ti in ng g- -u up p
When power is supplied, all the LEDs are turned ON.
Then, POWER LED (Power) lights in green, STATUS LED (Status/ECO mode) light in
orange, and self-diagnosis of hardware is executed.
On completion of self-diagnosis, POWER LED (Power), STATUS/ECO LED
(Status/ECO mode), TEMP LED (Temperature sensor), and FAN LED (Fan sensor)
light in green, and the Switching Hub starts operation as a Switching Hub.
1
1. .5 5. .2 2. . L LE ED D B Be eh ha av vi io or r w wh hi il le e O Op pe er ra at ti in ng g
This Switching Hub has a set of LEDs for each port. These LEDs indicate the
operation status of each port.
System LEDs
LED Behavior Description
Power LED
(POWER)
Green Light Power is ON
Off Power is OFF
Collision LED
(ANY COL.)
Orange Light
Packet collisions in either of ports operating in
half-duplex.
Off No packet collisions
PoE limit LED
(PoE LIM.)
Off *When fan control is set to High (factory default):
Supplying power in the range from 0 to 109 W.
*When fan control is set to Mid or Low:
Supplying power in the range from 0 to 47 W.
Green Light *When fan control is set to High (factory default):
Supplying power in the range from 109 to 124
W.
*When fan control is set to Mid or Low:
Supplying power in the range from 47 to 62 W.
Orange Blink *When fan control is set to High (factory default):
A sin
gle port's power supply is exceeding the
upper limit, or the total power supply of the
Switching Hub is exceeding 124W
*When fan control is set to Mid or Low:
A single port's power supply is exceeding the
upper limit, or the total power supply of the
Switching Hub is exceeding 62W.

18
LED Behavior Description
Temperature LED
(TEMP)
Green Light
Within the threshold setting of the internal
temperature sensor.
Orange Blink
Exceeding the threshold setting of the internal
temperature sensor.
(For details, refer to 4.6.3.c.)
Fan LED
(FAN)
Green Light The fan is operating normally.
Orange Blink Fan error.
Status/ECO mode
LED
(STATUS/ECO)
Green Light Operating in the Status mode.
Green Blink Operating in the ECO mode.
All port LEDs (Left) are turned off.
Orange Light Booting.
Orange Blink Malfunction. (Contact the seller.)
Off Power off
Power supply
mode LED (PoE)
Green Light Operating in the Power supply mode.
GIGA mode LED
(GIGA)
Green Light Operating in the GIGA mode.
Speed mode LED
(100M)
Green Light Operating in the Speed mode.
Duplex mode LED
(FULL)
Green Light Operating in the Duplex mode.
Loop History mode
LED
(LOOP HISTORY)
Green Light Operating in the Loop History mode.
Green Blink Loop is occurring, or occurred within the last 3
days.
Port LED display mode
In the Status mode described later, the port LED indicates link-up and
communication status. Pressing "LED DISPLAY CHANGE BUTTON" on the front
panel allows to change the port LED display mode as follows:
Port LED display mode Description
STATUS/ECO Displays link-up and communication status.
PoE Displays power supply status to the connected devices.
GIGA Displays link-up status in 1000 Mbps.
100M Displays link-up status in 100 Mbps.
FULL Displays link-up status in full-duplex and half-duplex.
LOOP HISTORY Displays the loop detection history and port blocking status.

19
Port LEDs
According to the switch of the "Port LED display mode" described in the
previous section, the port LED display on each port changes as follows:
Port LEDs Display mode Behavior Description
Left STATUS/ECO Green Light Link is established.
Green Blink Transmitting and receiving data.
Off No device connected, or set to ECO mode.
PoE Green Light Supplying power normally.
(ports 1 to 8 only)
Orange Blink Overload caused by a single port or the
total power supply of the SwitchingHub
(ports 1 to 8 only).
Off Not supplying power or no PoE-powered
device connected.
(* Ports 9 and 10 are always off.)
GIGA Green Light Link is established at 1000 Mbps.
Off Link is established at 100 Mbps or
10 Mbps, or no device is connected.
100M Green Light
Link is established at 100 Mbps.
Off Link is established at 1000 Mbps or
100Mbps, or no device is connected.
FULL Green Light
Link is established at full-duplex.
Off Link is established at half-duplex or no
device is connected.
LOOP HISTORY
Green Light Loop has been detected within the last
3 days.
Off No loop detection history.
Right - Orange Light
Shutting down by loop detection.
Off Not shutting down by loop detection.

20
Fig. 1-5 Port LEDs
1
1. .5 5. .3 3. . L Lo oo op p D De et te ec ct ti io on n F Fu un nc ct ti io on n
When a port causes a loop, the corresponding LED lights up in orange. In this case,
the port is automatically blocked (Default setting: 60 seconds) to prevent a loop. If
the loop is not recovered, the port will be blocked again. Recover the loop while
the port is blocked.
You can change the loop detection function settings (Enable/Disable) by pressing
and holding the LED display change button for more than 10 seconds or
configuring on the configuration screen. For details about settings on the
configuration screen, refer to 4.7.11. When successfully changed, the Loop History
mode LED is lit.
If you want to turn off the Loop History LED display, turn the Switching Hub off
and on. Up to 64 saved loop history entries can be retained in the Switching Hub.
Port LED (Left)
Port LED (Right)