Planet SGSW-4802 User manual

10/100/1000Mbps
Managed Stackable Switch
SGSW-4802
User s Manual

Trademarks
Copyright PLANETTechnologyCorp. 2003.
Contents subject to revision without prior notice.
PLANETis aregistered trademarkofPLANETTechnologyCorp. All other trademarksbelong to
their respective owners.
Disclaimer
PLANET Technology does not warrant that the hardware will work properly in all environments and
applications, and makes no warranty and representation, either implied or expressed, with respect to
the quality, performance, merchantability, or fitness for a particular purpose.
PLANET has made every effort to ensure that this User sManual is accurate; PLANET disclaims
liability for any inaccuracies or omissions that may have occurred.
Information in this User sManual is subject to change without notice and does not represent a
commitment on the part ofPLANET. PLANET assumes no responsibility for any inaccuracies that
may be contained in this User sManual. PLANET makes no commitment to update or keep current
the information in this User sManual, and reserves the right to make improvements to this User s
Manual and/or to the products described in this User s Manual, at any time without notice.
Ifyou find information in this manual that is incorrect, misleading, or incomplete, we would appreciate
your comments and suggestions.
FCC Warning
This equipment has been tested and found to comply with the limits for aClass Adigital device,
pursuant to Part 15 ofthe FCC Rules. These limits are designed to provide reasonable protection
against harmful interference when the equipment is operated in acommercial environment. This
equipment generates, uses, and can radiate radio frequency energy and, ifnot installed and used in
accordance with the Instruction manual, may cause harmful interference to radio communications.
Operation ofthis equipment in aresidential area is likely to cause harmful interference in which case
the user will be required to correct the interference at his own expense.
CE Mark Warning
This is aClass Aproduct. In adomestic environment, this product may cause radio interference, in which
case the user may be required to take adequate measures.
Revision
PLANETManaged Stackable Switch User's Manual
FOR MODEL: SGSW-4802
REVISION: 1.0
Part No.: EM-SGSW4802V1

TABLE OF CONTENTS
1. Introduction.........................................................................................................................................1
1.1 Checklist..........................................................................................................................................1
1.2 About the Switch..............................................................................................................................1
1.3 Features..........................................................................................................................................1
1.4 Specification....................................................................................................................................2
2. Hardware Description.........................................................................................................................4
2.1 Front Panel......................................................................................................................................4
2.2 Rear Panel.......................................................................................................................................5
2.3 Hardware Installation.......................................................................................................................5
2.4 Terminal Setup................................................................................................................................5
2.5 IP Configuration...............................................................................................................................6
3.Web-based management.....................................................................................................................8
3.1 Configuration...................................................................................................................................8
3.2 Web Pages......................................................................................................................................9
3.3 Port Config.......................................................................................................................................9
3.4 VLAN Config..................................................................................................................................11
3.5 Trunkconfig...................................................................................................................................12
3.6 Advanced Configuration................................................................................................................13
3.7 STP Config....................................................................................................................................13
3.7.1 STP Port.................................................................................................................................14
3.7.2 STP Bridge..............................................................................................................................15
3.8 IGMP..............................................................................................................................................16
3.8.1 IGMP Management.................................................................................................................16
3.8.2 Definition on IGMP v1.0 and v2.0...........................................................................................16
3.9 Stack..............................................................................................................................................17
3.10 SNMP..........................................................................................................................................20
3.11 RMON Statistics..........................................................................................................................21
3.12 Port Security................................................................................................................................22
3.12.1 Setting Up Procedures..........................................................................................................22
3.12.2 Delete MAC Address............................................................................................................23
3.13 Mirror Port....................................................................................................................................24
3.13.1 Using Mirror Port to Monitor Traffic.......................................................................................24
3.13.2 Setup Procedures.................................................................................................................24
3.14 Aging Control...............................................................................................................................25
3.15 Address Search...........................................................................................................................25
3.15.1 Host Searching Procedures..................................................................................................26
3.15.2 MAC Address Search...........................................................................................................27
3.16 SystemTools...............................................................................................................................28
3.17 SystemConfig.............................................................................................................................28
3.18 SystemInformation......................................................................................................................29
3.19 Change Password.......................................................................................................................30
3.20 Firmware Upgrade.......................................................................................................................31

3.21 Save & Reboot.............................................................................................................................34
3.21.1 Save......................................................................................................................................34
3.21.2 Backup..................................................................................................................................34
3.21.3 Restore.................................................................................................................................36
3.21.4 Clear and Reset....................................................................................................................37
3.22 Message Windows......................................................................................................................38
3.23 Reboot Switch..............................................................................................................................39
3.24 Logout..........................................................................................................................................39
4 Console interface...............................................................................................................................41
4.1 CONNECTTO PC.........................................................................................................................41
4.2 Logging on to the Switch...............................................................................................................42
4.2.1. sys--System Management Commands..................................................................................45
4.2.2 logout......................................................................................................................................55
4.2.3 port--Port Management Commands.......................................................................................55
4.2.4. vlan--VLAN Management Commands...................................................................................61
4.2.5 trunk--TRUNK Management Commands................................................................................63
4.2.6. stp--STP Management Commands.......................................................................................64
4.2.7 snmp--SNMP Management Commands.................................................................................68
4.2.8 stack--STACK Management Commands................................................................................70
4.2.9 igmp--IGMP Management Commands...................................................................................71
5. Switch Operation...............................................................................................................................73
5.1 Address Table...............................................................................................................................73
5.2 Learning.........................................................................................................................................73
5.3 Forwarding & Filtering....................................................................................................................73
5.4 Store-and-Forward........................................................................................................................73
5.5 Auto-Negotiation............................................................................................................................73
6. Troubleshooting................................................................................................................................74
Appendix ANetworking Connection...................................................................................................75
A.1 Switch‘s RJ-45 Pin Assignments...................................................................................................75
A.2 10/100Mbps, 10/100Base-TX.......................................................................................................75
A.3 RJ-45 cable pin assignment..........................................................................................................75

1
1. INTRODUCTION
1.1 Checklist
Check the contents of your package for following parts:
l SGSW-4802.
l User's manual CD.
l Power cord.
l 19”rackmounting kit.
l RS-232 cable.
l QuickInstallation Guide.
Ifanyofthese pieces are missing or damaged, please contact your dealer immediately,ifpossible,
retain the carton including the original packing material, and use themagainst to repackthe product in
case there is a need to return it to us for repair.
1.2 About the Switch
The SGSW-4802 Managed stackable Switch is designed to provide your network with Ethernet, Fast
Ethernet, Gigabit Ethernet connectivityover twisted pair and fiber optic cabling.
Twoexpansion slots on the front panel ofthe SGSW-4802 Managed Switch further add to the flexibility
ofthe systems.
The SGSW-4802 Managed Switch is acombination of48x10/100M Ethernet RJ-45 ports and 2op-
tional module slots.
The twooptional modules can be 1-Port 100 Base-FX Managed Fiber Modules, Gigabit 1000Base-T
Managed Switch Modules, and Gigabit 1000Base-SX/LX Managed Fiber Modules.
With its build-in Web-based Management, managing and configuring the SGSW-4802 Managed
Switch becomes easier.
Fromcabinet management to port-level control and monitoring, you can visuallyconfigure and
manage your networkvia Web Browser, just clickyour mouse instead oftyping cryptic command
strings. However, the SGSW-4802 Managed Switch can also be managed via Console, or third-party
SNMP Management.
1.3 Features
Complies with the IEEE802.3 Ethernet, IEEE802.3u Fast Ethernet, IEEE802.3zand IEEE802.3ab
Gigabit Ethernet standard
w Provide 2 module slots for 100Mbps-FX, 1000Mbps-Tor 1000Mbps-SX/LX option ofmodules
w Features Store-and-Forward mode with wire-speed filtering and forwarding rates
w Auto-negotiation & Full-duplex/Half-duplex
w Automatic source address learning and aging
wSupport up to 8K MAC address
w Support IEEE802.1D Spanning Tree Protocol
w IEEE802.3x compliant full-duplex flowcontrol
w Broadcast stormcontrol, runt and CRC Filtering eliminates erroneous packets to optimizethe
networkbandwidth
w Stackup to 16 units
w LED indicators for simple diagnostics and management

2
w Internal power supply
w Auto MDI/ MDI-X on each port
w Networkmanagement configuration:
− Web-based management
− Console and Telnet Configuration
− SNMP networkmanagement
− IEEE 802.1Q Tagging VLAN (32 VLAN Groups)
− Port Trunking supported
− IEEE 802.1D Spanning Tree Protocol (STP)
− IGMP and Sniffer (Port Mirroring) supported
− Port Priority- 802.1p supported
− MAC / IP Address search
− Port securitycontrol (MAC address filtering)
− Virtual stacking up to 16 units
− Broadcast StormFilter function supported
− Firmware upgradeable through Web interface
1.4 Specification
Product SGSW-4802
10/100/1000Mbps Managed Ethernet Stackable Switch
Hardware Specification
Ports 48 10/ 100Base-TX RJ-45 Auto-MDI/MDI-X ports
Module Slot 2 for 1000Base-SX/LX/Tand 100Base-FX modules
StackInterface Through Ethernet interface. Up to 16 units can be managed bysingle IP
Switch Processing Scheme Store-and-forward
Throughput (packet per second) 10Mpps
Switch Fabric 9.6Gbps
Address Table 8K entries (4K for each 24-port)
Queue Buffer 12Mbytes (6Mbytes for each 24-port)
FlowControl Backpressure for halfduplex, IEEE 802.3x Pause Frame for full duplex
Broadcast StormControl Discards broadcast packets at a critical threshold
Dimensions 432 x 240 x 87 mm, 2U high
Weight 6.2 kg
Power Requirement 100~240 VAC, 50-60 Hz
Power Consumption / Dissipation 100 Watts maximum/ 341 BTU/hr maximum
Temperature Operating: 0~40 degree C, Storage -20~70 degree
HumidityOperating: 10% to 90%, Storage: 5% to 90% (Non-condensing)
NetworkManagement
SystemConfiguration Console port, Web browser, SNMP/RMON
Management Agent SNMP Support: MIB II, Ethernet MIB, Repeater MIB and RMON MIB
Spanning Tree Algorithm IEEE 802.1D provides redundant linksupport

3
VLAN IEEE 802.1Q VLAN, up to 32 VLANs supported
QoS
IEEE 802.1p QoS support with 2priorityqueue using WFQ (Weighted Fair
Queuing)
IGMP Multicast Filtering Passive snooping on IGMP Query/Report messages
Port trunking Up to 4 ports can be combined into a fat pipe
Port Mirroring 1 mirroring port to monitor several mirrored ports
Standards Conformance
Regulation Compliance FCC Part 15 Class A, CE
Standards Compliance
IEEE 802.3 (Ethernet)
IEEE 802.3u (Fast Ethernet),
IEEE 802.3z(1000Base-SX/LX), IEEE 802.3ab(1000Base-T),
IEEE 802.1D (STP),
IEEE 802.3x (full-duplex flowcontrol),
IEEE 802.1p (QoS),
IEEE 802.1Q (VLANs)
RFC 768 UDP
RFC 783 TFTP
RFC 791 IP
RFC 792 ICMP
RFC 826 ARP
RFC 1122 Host Requirements
RFC 2068 HTTP
RFC 2236 IGMP v2
RFC 1157 SNMP v1/v2
RFC 1213 MIB II
RFC 1643 Ethernet MIB

4
2. HARDWARE DESCRIPTION
This product series provide three different running speed –10Mbps, 100Mbps, and 1000Mbps in the
same switch and automaticallydistinguish the speed ofincoming connection.
This section describes the hardware features ofSGSW-4802. For easier management and control ofthe
switch, familiarizeyourselfwith its displayindicators, and ports. Front panel illustrations in this chapter
displaythe unit LED indicators. Before connecting anynetworkdevice to the switch, read this chapter
carefully
There are following option module for expansion:
l 1-Port 100Base-FX Managed Fiber Module (SC/ST, Multi-mode fiber)
l 1-port 100Base-FX Fast Ethernet Module (SC, Single-mode fiber, 15km)
l 1-Port Gigabit 1000Base-TManaged Switch Module
l 1-Port Gigabit 1000Base-SX/LX Managed Fiber Module
2.1 Front Panel
The Front Panel ofthe SGSW-4802 Managed Switch consists of48x auto-sensing 10/100Mbps
Ethernet RJ-45 Ports, twooptional expansion slots, and Console port. The LED Indicators are also
located on the front panel ofthe Switch.
Console
38400, 8,N, 1
1357
2468
9111315
10121416
17192123
18202224
41434547
42444648
33353739
34363840
25272931
26283032
49
50
SGSW-4802 Switch front panel
2.1.1 LED indicators
SGSW-4802
PWRGreen Lit on: Power on
Lit off: power off
LinkGreen Lit on: the connection is good
Lit off: the port is disabled or not detecting a link
Mode:(could be three kinds ofmeaning, varies with the Mode button)
ACTGreen Lit on: the connection is good.
Blink: The port is receiving or transmitting data
FDX
Green Lit on: the port run at full-duplex Blink: Half-Duplex/ Collision
Off: Half-duplex or not connected
100 Green Lit on: run at 100Mbps
Lit off: run at 10Mbps or not connected
2.1.2 Buttons indicators
SGSW-4802
RESETWhen press this button, Switch will reboot
MODE Hold the button for at least 5 seconds, the LED will turns to the next LED in
cycle. (ACT àFDXàSpeedàACT)

5
2.2 Rear Panel
The rear panel ofthe Switch indicates an AC inlet power socket, which accepts input power from100
to 240VAC, 50-60Hz.
100-240VAC
50/60Hz
SGSW-4802 Switch rear panel
Power Notice:
1.The device is apower-required device, it means, it will not worktill it is powered. Ifyour networks
should active all the time, please consider using UPS (Uninterrupted Power Supply)for your de-
vice. It will prevent you fromnetworkdata loss or networkdowntime.
2.In somearea, installing asurge suppression device mayalso help to protect your switch from
being damaged byunregulated surge or current to the Switch or the power adapter.
2.3 Hardware Installation
2.3.1 Connecting end node or hub or switch
1. Place the Switch on asmooth surface or fasten the mounting brackets with the provided screwsin a
standard 19”rack.
2. Connect switch or PC to one port ofthe Switch using Category3/4/5 UTP/STP cabling.
3. Connect another switch or PC to the other port ofSwitch byfollowing the sameprocess as described
in Step2.
Notice:
Cable distance for Switch
The cable distance between Ethernet Switch and hub/PC should not exceed 100 meter for
UTP/STPcable, 2km for 62.5/125 and 50/125 fiber cable on 100Base-FX module, 220mfor
62.5/125 fiber cable and 500mfor 50/125 fiber cable on 1000Base-SX module, 550m for 62.5/125
and 50/125 fiber cable and 10km for 9/125 fiber cable on 1000Base-LX module.
Make sure the wiring is correct
It can be used Category3/4/5 cable in 10 Mbps operation. Toreliablyoperate your networkat
100Mbps and 1000Mbps, you must use an Unshielded Twisted-Pair (UTP) Category5cable, or
better Data Grade cabling. While aCategory3or 4cable mayinitiallyseemto work,it will soon
cause data loss.
2.3.2 Connecting to Network Backbone or Server
Connect to the Gigabit Ethernet ports with Category 5copper cable or fiber optic cable for uplinking to
anetworkbackbone or networkserver. These ports operate at 1000Mbps in full-duplex mode. Avalid
connection is indicated when the LinkLED is light.
2.4 Terminal Setup
To configure the system,connect aserial cable to aCOM port on aPC or notebook computer and to
serial (console) port ofthe device. The console port ofthe device is DCE already,so that you can
connect the console port directlythrough PC without the need ofNull Modem.
Aterminal programis required to makethe software connection to the device. Windows Hyper Ter-

6
minal programmaybe agood choice. It can be accessed fromthe Start menu. ClickSTART,then
Programs, Accessories and then Hyper Terminal.
MS-DOS based terminal programsuch as PC-PLUS, PROCOMM, can also makethe connection with
the device built-in software. The COM port should be configured as:
♦Baud : 38400
♦Parity: None
♦Data bits : 8
♦Stop bits : 1
♦FlowControl: none
Once the terminal has connected to the device, power on the device. The terminal will display that it is
loading the firmware. Then, the screen as belowwill showup:
Press “Enter”and input the password. The default password is “admin”.
2.5 IP Configuration
Once log on to the console, the “Command>”prompt will be shown. You can type, “help”for all
available commands.

7
To setup the IP address, please use “sys set ip”command in the following format:
sys set ip <IP Address> <Subnet Mask> <Default Gateway>
For example, to configure the switch with the following IP settings:
IP Address: 192.168.0.2
Subnet Mask: 255.255.255.0
Default Gateway: 192.168.0.254
Press input the following command and press <Enter> button:
sys set ip 192.168.0.2 255.255.255.0 192.168.0.254
Ifthe IP is successful configured, the switch will automaticallyrestart as the following window.You can
then configure the switch through its web interface.

8
3. WEB-BASED MANAGEMENT
3.1 Configuration
As well as the menu-driven system configuration program,the agent module provides an embedded
HTTPWeb agent. This agent can be accessed by any computer on the networkthat using astandard
Web browser (Internet Explorer 5.0 or above, or Netscape Navigator 4.5 or above).
Using the Web browser management interface you can configure aswitch and viewstatistics to
monitor networkactivity.The Web interface also provides access to arange ofSNMP management
functions with access to the switch's MIB and RMON database.
Prior to accessing the switch fromaWeb browser, be sure you have first performed the following
tasks:
Configure it with avalid IP address, subnet mask,and default gatewayusing an out-of-band serial
connection.
For Internet Explorer 5.0 or later version user, please checkthe Java setting belowbefore startup.
1. Clickon Tools
2. PickInternet Options
3. Select the Securitytab
4. Select Local Intranet (clickon the icon)
5. Clickon Sites, clickAdvanced and add the IP address ofthe switch to the zone
6. Clickon CustomLevel
7. Scroll down and set Java Permissions to Custom
8. Press the Java CustomSettings button
9. Select the Edit Permissions tab
10. Set Run Unsigned Content to Enable
11. Press OK for all open dialog windows
!
NOTE
For IE5.0 or later version, if you can not find the Java option in point 7
,please makesure your
Ethernet Explorer is installed with “Microsoft VM”JAVA virtual-machine plug-in.

9
3.2 Web Pages
Toaccess the Web-browser interface you must first enter the password. The default password is
"admin" You will see the following screen comes out on the Web browser program:
Figure 3-1: SGSW-4802 login Web Page
After the password is entered you will see the main menu web screen ofSGSW-4802.
Figure 3-2: The start up screen ofSGSW-4802 Web Page
3.3 Port Config
This section allowsyou to have an easyaccess in configuring the ports ofthe management Switch.
Notice that the “Linkstate”option indicates “Up”.This showsthat the port is connected to the network.
It can either be in “Up”(Connected) or “Down”(No connection) state.

10
Figure 3-3: The Port Config Web Page
Choose Port
You can choose a port either byclicking on the picture or byselecting it at the “Choose Port”field.
Speed/ Duplex
Speed/ Duplex is to select the operation mode ofchosen port. The options are as:
‘Auto :Auto negotiation
‘10Mbps HD : 10 Base-THalfDuplex
‘10Mpbs FD :10Base-TFull Duplex
‘100Mpbs HD :100Base-TX HalfDuplex
‘100Mbps FD :100Base-TX Full Duplex
Broadcast Rate Limit
This function sets broadcast limit to the desired rate for the specified port. It controls the reception of
broadcasting packets. The ranging for Broadcast rate limit varies from0% to 100%. The higher the
rate is, the more broadcast packets can pass through the port. Rate is the percent ofthe traffic to
allowbefore throttling. That is, ifyou configure this value to 10% and current connected speed are
100M, Only10M broadcast data can pass through the port.
Port Priority
In atagged VLAN application, you can specifythe VLAN priorityto expedite the VLAN traffic. There
are 8 levels ofpriority, namely ‘0, ‘1, ‘2, ‘3, ‘4, ‘5, ‘6and ‘7in ascending priority.
Port VLAN ID
VLAN ID is the sequence number ofaVLAN. The setting ofthe VLAN ID depends on ‘Belongs to
VLANs option. Thus, you should first configure the VLAN table through “VLAN config”option and
then specifythis value.
Port State
Port state is for enabling or disabling the switch operation ofthe chosen port. Ifit is ‘enabled,the
chosen port will receive and forward the packets, and learns the respective source MAC Addresses.
Ifit is ‘disable,the chosen port will not receive or forward anypackets or learn source MAC Ad-

11
dresses.
It should be noted that ifthe cpu port (i.e. the switch port connected to the management workstation)
is disabled, without doubt, the communication linkbetween user and the switch will not proceed
further. It is recommended to locate the linkyour PC used before disable the port state.
FlowControl
This feature enables or disables the FlowControl function ofthe port. Flowcontrol can eliminate
frameloss by "blocking" traffic fromend stations or segments connected directlyto the switch when
its buffers fill. IEEE 802.3x flowcontrol is used for full duplex. Note that flowcontrol should not be
used ifa port is connected to a hub.
3.4 VLAN Config
The SGSW-4802 supports Virtual LAN, which logicallygroups the connection into VLANs for traffic
isolation and securitypurposes. Both tagged and untagged based VLAN are supported with atotal
maximumof32 groups. Each VLAN group onlyforwards traffic within its member ports. For tagged
VLAN, each port can be amember ofmore than one VLAN group and it also supports prioritywith eight
levels. There is also provision for creating an untagged VLAN, which support aconnection with a
legacyuntagged port. The VLAN configuration feature also allowsyou to build, delete and viewtagged
/untagged VLAN groups and setting priorityfor tagged VLANs. The range ofVID starts from3to 4091,
as VID 001 and VID 002 is the default for Group 1 and Group 2.
Figure 3-4: The VLAN config Web Page
Setup Procedures
Step 1: Decide which Group you want to set for monitoring using mirror port. Clickstatus columnfor
that particular group and keyin the VLAN ID.
Step 2: Next, clickon the dashed line-‘to select either “T”for Tagged or “U”for Untagged.
Step 3: Click “Apply”button after you satisfied with the setup. Click“Save”button to update the current
configuration.

12
3.5 Trunk config
The SGSW-4802 provides 2 trunk groups and maximumup to 4-ports per trunk.Port Trunking is the
abilityto group together several switch ports to increase the bandwidth between the management
switch and other switch. This is an inexpensive method to increase throughput between switches (or to
servers). Wedefine the Port Trunking as the ability to group aset ofports into asingle logical link.The
port trunkacts as single linkbetween switches. It doesntcreate aloop even though it is physically
connected as such.
Figure 3-5: The Port Trunkconfig Web Page
Port Trunking Setup Procedures
Step 1: Decide to create a trunkgroup fromport 1-24 or port 25-48.
Step 2: You can choose up to 4-port for Trunking byselecting ‘-‘as “T”.
Step 3: Clickon “Apply”button to make the configuration effective.
Step 4: Click “Save”button to save the current configuration.
!
NOTE Ifyou select more than 4 ports for trunking, the following error message will appear:
Click “OK”button and select the ports again.

13
3.6 Advanced Configuration
The available options in “Advanced menu”are:
STP Config The Spanning Tree Setup Screen
IGMP Config The IGMP Setup Screen
StackConfig The StackSetup Screen
SNMP Config The SNMP Setup Screen
RMON Statistics ShowRMON statistics information
Port Security The Port SecuritySetup Screen
MirrorPort Config The Mirror Port Setup Screen
Aging Control The Aging Control Setup Screen
Address Search The Address Search Setup Screen
3.7 STP Config
The STPConfig provides two-menu pages to configure: STPPort and STPBridge. The STPscreen in
Figure 3-6 appears.
Figure 3-6: The STP Port Web Page

14
3.7.1 STP Port
This function allows assigning Path Cost value and Prioritylevel on each port ofSGSW-4802.
Please refer to the detail description ofPath Cost and Priorityand setup procedures shown as
below.
Description of Parameters
Bridge Port
This option shows the port ofthe bridge that connects to the root bridge.
Path Cost
The STA algorithmto determine the best path between devices uses this parameter. Therefore,
lower values should be assigned to ports attached to faster media, and higher values assigned to
ports with slower media. (Path cost takes precedence over port priority.)
The default and recommended range is: Ethernet: 100 (50~600) Fast Ethernet: 19 (10~60) Gigabit
Ethernet: 4 (3~10). The allowed range is 0 - 65535.
Priority
Defines the priority for the use ofaport in the Spanning Tree algorithm.Ifthe path cost for all ports
on aswitch are the same, the port with the highest priority(i.e., lowest value) will be configured as
an active linkin the Spanning Tree. Where more than one port is assigned the highest priority,the
port with lowest numeric identifier will be enabled. The range is0 - 255.
Setup Procedures
Step 1: Select anyone ofthe ports, from1 to 50, to connect to the root bridge.
Step 2: Keyin the value for Path Cost.
Step 3: Set the prioritylevel.
Step 4: Click “Apply”button after you satisfied with the setup. Click “Save”button to save the current
configuration.
!
NOTE
Due the hardware restriction, the STPfunction cannot across between port 1-24, slot 49
and port 25-48, slot 50.

15
3.7.2 STP Bridge
This function provides to have a clearer viewin Spanning Tree parameters ofSGSW-4802. The STP
Bridge screen in Figure 3-7 appears.
Figure 3-7: The STP Bridge Web Page
Description of Parameters
STP State
When STP is enabled, it will dynamicallydetect network looping owing to mis-configuration of the
networktopology.The redundant connectors will be disabled to avoid looping ofpackets. Looping
would often result in flooding ofbroadcast packets, halting the normal traffic.
Root Priority
Device priorityis used in selecting the root device, root port, and designated port. The device with
the highest prioritybecomes the STAroot device. However, ifall devices have the samepriority,
the device with the lowest MAC address will then becomethe root device. The available range is
0-65535 sec.
Hello Time
The Hello timeofthe Spanning Tree field showsthe number ofseconds between the transmis-
sions ofSpanning Tree protocol configuration messages. The available range is1-10 sec.
Forward Delay
The Forward Delayfield showsthe number ofseconds aport waits before changing fromits
Spanning Tree Protocol learning and listening states to the forwarding state. This waiting is nec-
essary so that other switches on the networkensure no loop is formed before they allowother port
to forward packets.
The available range is 4-30 sec.
Max Age
The maximumage timeofthe Spanning Tree showsthe number ofseconds the bridge waits
without receiving Spanning Tree Protocol configuration message before attempting areconfigu-
ration. The available range is 6-40 sec.

16
Setup Procedures
Step 1: Select Spanning Tree state option, either to enable or disable it.
Step 2: Set Root Priorityfrom 0 s –65535 s, and Hello Time from 1 s –10 s.
Step 3: Keyin the Forward DelayTime, MaximumAge and Hello Time.
Step 4: Click “Apply”button and save it ifeverything is OK.
!
NOTE
The screen is divided into twosections. Current Spanning
Tree Root section displaysthe
read-
onlySpanning Tree settings for the current root switch and the parameters this
switch is to use when it becomes the root switch.
3.8 IGMP
Internet Group Management Protocol (IGMP) is an Internet protocol that provides awayfor an
Internet computer to report its multicast group membership to adjacent routers. It allowsthe man-
agement switch to forward multicast traffic intelligently.The switch "snoops" the IGMP queryand
report messages and forwards traffic to onlythe ports that request the multicast traffic. This prevents
the switch frombroadcasting the traffic to all ports and possiblyaffecting networkperformance. The
membership ofahost group is dynamic -hosts mayjoin and
leave groups at any time. There is no restriction on the location
or number ofmembers in ahost group. Ahost maybe a
member ofmore than one group at atime. Ahost need not be a
member ofa group to send datagramsto it. The IGMP screen
in Figure 3-8 appears.
Figure 3-8: The IGMP Web Page
3.8.1 IGMP Management
To activate IGMP function,
Step 1: Select “enabled”in the IGMP state field.
Step 2: Click on the radio button to select the version for IGMP.
Step 3: Click the “Apply”button and save your current configuration.
3.8.2 Definition on IGMP v1.0 and v2.0
For IGMP v1.0,
Host Group Addresses
Host groups are identified by class DIP
addresses, i.e., those with "1110" as their
high-order four bits. Class DIP addresses,
i.e., those with "1111" as their high-order
four bits, are reserved for future addressing
modes.
In Internet standard "dotted decimal" nota-
tion, host group addresses range from
224.0.0.0 to 239.255.255.255. The address
224.0.0.0 is guaranteed not to be assigned
to any group, and 224.0.0.1 is assigned to
the permanent group of all IP hosts (in-
cluding gateways). This is used to address
all multicast hosts on the directly connected
network. There is no multicast address (or
any other IP address) for all hosts on the
total Internet. The addresses of other
well-known, permanent groups are to be
published in "Assigned Numbers".