AirLive SNMP-GSH2416 User manual

8+16 Pure Gigabit SNMP Managed Switch
SNMP-GSH2416

ii AirLive SNMP-GSH2416 User’s Manual
Table of Contents
CAUTION--------------------------------------------------------------------------------------IV
ELECTRONIC EMISSION NOTICES---------------------------------------------------------IV
CHAPTER 1. INTRODUCTION--------------------------------------------------------- 2
1-1. OVERVIEW OF SNMP-GSH2416 SNMPMANAGED GIGABIT SWITCH ------- 2
1-2. CHECKLIST ----------------------------------------------------------------------------- 4
1-3. FEATURES ------------------------------------------------------------------------------ 4
1-4. VIEW OF SNMP-GSH2416 SNMPMANAGED GIGABIT SWITCH-------------- 6
1-4-1. User Interfaces on the Front Panel (Button, LEDs and Plugs)----- 6
1-4-2. User Interfaces on the Rear Panel---------------------------------------- 7
1-5. VIEW OF THE OPTIONAL MODULES ------------------------------------------------- 8
CHAPTER 2. INSTALLATION ---------------------------------------------------------- 9
2-1. STARTING SNMP-GSH2416 SNMPMANAGED GIGABIT SWITCH UP------- 9
2-1-1. Hardware and Cable Installation------------------------------------------- 9
2-1-2. Installing Chassis to a 19-Inch Wiring Closet Rail--------------------11
2-1-3. Cabling Requirements-------------------------------------------------------11
2-1-3-1. Cabling Requirements for TP Ports --------------------------------12
2-1-3-2. Cabling Requirements for 1000SX/LX SFP Module------------12
2-1-3-3. Switch Cascading in Topology---------------------------------------13
2-1-4. Configuring the Management Agent of 8-Port TP + 16-Port
SFP L2 Managed Gigabit Switch-----------------------------------------16
2-1-4-1. Configuring the Management Agent of 8-Port TP + 16-Port
SFP L2 Managed Gigabit Switch through the Serial
RS-232 Port--------------------------------------------------------------17
2-1-4-2. Configuring the Management Agent of 8-Port TP + 16-Port
SFP L2 Managed Gigabit Switch through the Ethernet
Port-------------------------------------------------------------------------19
2-1-5. IPAddress Assignment------------------------------------------------------20
2-2.TYPICALAPPLICATIONS--------------------------------------------------------------25
CHAPTER 3. OPERATION OF WEB-BASED MANAGEMENT --------------26
3-1. WEB MANAGEMENT HOME OVERVIEW--------------------------------------------28
3-1-1. System Information-----------------------------------------------------------31
3-1-2. IP Configuration---------------------------------------------------------------33
3-1-3. Time Configuration -----------------------------------------------------------36
3-1-4. Account Configuration-------------------------------------------------------39
3-1-5. Management Policy----------------------------------------------------------40
3-1-6. Virtual Stack--------------------------------------------------------------------43
3-2. PORT CONFIGURATION --------------------------------------------------------------46
3-2-1.Port Status ----------------------------------------------------------------------46
3-2-2. Port Configuration ------------------------------------------------------------52

iii AirLive SNMP-GSH 2416 User's Manual
3-2-3. Simple Counter----------------------------------------------------------------54
3-2-4. Detail Counter -----------------------------------------------------------------56
3-3. MIRROR--------------------------------------------------------------------------------59
3-4. BANDWIDTH MANAGEMENT ---------------------------------------------------------60
3-5. QOS(QUALITY OF SERVICE)CONFIGURATION -----------------------------------62
3-6. SNMPCONFIGURATION-------------------------------------------------------------72
3-7. IGMPSNOOPING---------------------------------------------------------------------74
3-8. MAX.PACKET LENGTH---------------------------------------------------------------78
3-9. DHCPBOOT--------------------------------------------------------------------------79
3-10. VLAN---------------------------------------------------------------------------------80
3-10-1. VLAN Mode ------------------------------------------------------------------80
3-10-2. Tag-based Group------------------------------------------------------------83
3-10-3. Port-based Group-----------------------------------------------------------85
3-10-4. Tag Rule-----------------------------------------------------------------------87
3-11. MACTABLE--------------------------------------------------------------------------89
3-12. GVRPCONFIGURATION -----------------------------------------------------------96
3-13. STPCONFIGURATION------------------------------------------------------------102
3-13-1. STP Status------------------------------------------------------------------102
3-13-2. STP Configuration --------------------------------------------------------104
3-13-3. STP Port Configuration--------------------------------------------------106
3-14.TRUNKING CONFIGURATION-----------------------------------------------------109
3-15. 802.1X CONFIGURATION -------------------------------------------------------- 116
3-16.ALARM CONFIGURATION ---------------------------------------------------------126
3-17. CONFIGURATION ------------------------------------------------------------------129
3-17-1. Save/Restore --------------------------------------------------------------130
3-17-2. Config File ------------------------------------------------------------------135
3-18. DIAGNOSTICS----------------------------------------------------------------------136
3-19.TFTPSERVER --------------------------------------------------------------------139
3-20. LOG ---------------------------------------------------------------------------------140
3-21. FIRMWARE UPGRADE ------------------------------------------------------------142
3-22. REBOOT----------------------------------------------------------------------------143
3-23. LOGOUT ----------------------------------------------------------------------------144
CHAPTER 4. OPERATION OF CLI MANAGEMENT--------------------------145
4-1. CLI MANAGEMENT -----------------------------------------------------------------145
4-1-1. Login---------------------------------------------------------------------------145
4-2. COMMANDS OF CLI ----------------------------------------------------------------147
4-2-1. Global Commands of CLI-------------------------------------------------148
4-2-2. Local Commands of CLI --------------------------------------------------154
CHAPTER 5. MAINTENANCE------------------------------------------------------- 235
5-1. RESOLVING NO LINK CONDITION-------------------------------------------------235
5-2. Q&A----------------------------------------------------------------------------------235
APPENDIX A TECHNICAL SPECIFICATIONS ----------------------------------236
APPENDIX B NULL MODEM CABLE SPECIFICATIONS-------------------- 240

iv AirLive SNMP-GSH2416 User’s Manual
Caution
Circuit devices are sensitive to static electricity, which can damage their delicate
electronics. Dry weather conditions or walking across a carpeted floor may cause you to
acquire a static electrical charge.
To protect your device, always:
•Touch the metal chassis of your computer to ground the static electrical charge before
you pick up the circuit device.
•Pick up the device by holding it on the left and right edges only.
Electronic Emission Notices
Federal Communications Commission (FCC) Statement
This equipment has been tested and found to comply with the limits for a class A
computing device pursuant to Subpart J of part 15 of FCC Rules, which are designed to
provide reasonable protection against such interference when operated in a commercial
environment.
European Community (CE) Electromagnetic Compatibility Directive
This equipment has been tested and found to comply with the protection requirements
of European Emission Standard EN55022/EN60555-2 and the Generic European Immunity
Standard EN50082-1.
EMC:
EN55022(1988)/CISPR-22(1985) class A
EN60555-2(1995) class A
EN60555-3
IEC1000-4-2(1995) 4K V CD, 8KV, AD
IEC1000-4-3(1995) 3V/m
IEC1000-4-4(1995) 1KV – (power line), 0.5KV – (signal line)

About this user’s manual
In this user’s manual, it will not only tell you how to install and connect your
network system but configure and monitor the SNMP-GSH2416 SNMP Managed
Gigabit Switch through the built-in CLI and web by RS-232 serial interface and
Ethernet ports step-by-step. Many explanation in detail of hardware and software
functions are shown as well as the examples of the operation for web-based
interface and command-line interface (CLI).
Overview of this user’s manual
Chapter 1 “Introduction” describes the features of SNMP-GSH2416 SNMP
Managed Gigabit Switch
Chapter 2 “Installation”
Chapter 3 “Operation of Web-based Management”
Chapter 4 “Operation of CLI Management”
Chapter 5 “Maintenance”

2 AirLive SNMP-GSH2416 User’s Manual
1. Introduction
1-1. Overview of SNMP-GSH2416 SNMP Managed Gigabit Switch
24-port Gigabit L2 Managed Switch, is a standard switch that meets all IEEE
802.3/u/x/z Gigabit, Fast Ethernet specifications. The switch included 8-Port
10/100/1000Mbps TP and 16-Port Gigabit SFP Fiber management Ethernet switch.
The switch can be managed through RS-232 serial port via directly connection, or
through Ethernet port using CLI or Web-based management unit, associated with
SNMP agent. With the SNMP agent, the network administrator can logon the switch
to monitor, configure and control each port’s activity in a friendly way. The overall
network management is enhanced and the network efficiency is also improved to
accommodate high bandwidth applications. In addition, the switch features
comprehensive and useful function such as QoS (Quality of Service), Spanning
Tree, VLAN, Port Trunking, Bandwidth Control, Port Security, SNMP/RMON, IGMP
Snooping capability via the intelligent software. It is suitable for both metro-LAN and
office application.
In this switch, 1000Mbps SFP Fiber transceiver is used for high-speed
connection expansion.
⎯1000Mbps LC, Multi-Mode, SFP Fiber transceiver
⎯1000Mbps LC, 10km, SFP Fiber transceiver
⎯1000Mbps LC, 30km, SFP Fiber transceiver
⎯1000Mbps LC, 50km, SFP Fiber transceiver
⎯1000Mbps BiDi LC, 20km, 1550nm SFP Fiber WDM transceiver
⎯1000Mbps BiDi LC, 20km, 1310nm SFP Fiber WDM transceiver
10/100/1000Mbps TP is a standard Ethernet port that meets all IEEE
802.3/u/x/z Gigabit, Fast Ethernet specifications. 1000Mbps SFP Fiber transceiver
is a Gigabit Ethernet port that fully complies with all IEEE 802.3z and 1000Base-
SX/LX standards.
1000Mbps Single Fiber WDM (BiDi) transceiver is designed with an optic
Wavelength Division Multiplexing (WDM) technology that transports bi-directional
full duplex signal over a single fiber simultaneously.
For upgrading firmware, please refer to the Section 3-21 or Section 4-2-2 for
more details. The switch will not stop operating while upgrading firmware and after
that, the configuration keeps unchanged.

3 AirLive SNMP-GSH 2416 User's Manual
• Key Features in the Device
QoS: Support Quality of Service by the IEEE 802.1P standard. There are two
priority queue and packet transmission schedule.
Spanning Tree:
Support IEEE 802.1D, IEEE 802.1w (RSTP: Rapid Spanning Tree
Protocol) standards.
VLAN:
Support Port-based VLAN and IEEE802.1Q Tag VLAN. Support 256 active
VLANs and VLAN ID 1~4094.
Port Trunking:
Support static port trunking and port trunking with IEEE 802.3ad LACP.
Bandwidth Control:
Support ingress and egress per port bandwidth control.
Port Security:
Support allowed, denied forwarding and port security with MAC address.
SNMP/RMON:
SNMP agent and RMON MIB. In the device, SNMP agent is a client
software which is operating over SNMP protocol used to receive the
command from SNMP manager (server site) and echo the corresponded
data, i.e. MIB object. Besides, SNMP agent will actively issue TRAP
information when happened.
RMON is the abbreviation of Remote Network Monitoring and is a branch of
the SNMP MIB.
The device supports MIB-2 (RFC 1213), Bridge MIB (RFC 1493), RMON
MIB (RFC 1757)-statistics Group 1,2,3,9, VLAN MIB (802.1Q, RFC2674),
Ethernet MIB (RFC 1643) and so on.
IGMP Snooping:
Support IGMP version 2 (RFC 2236): The function IGMP snooping is used
to establish the multicast groups to forward the multicast packet to the
member ports, and, in nature, avoid wasting the bandwidth while IP
multicast packets are running over the network.

4 AirLive SNMP-GSH2416 User’s Manual
1-2. Checklist
Before you start installing the switch, verify that the package contains the
following:
⎯A set of SNMP-GSH2416 SNMP Managed Gigabit Switch
⎯Modules (optional)
⎯Mounting Accessory (for 19” Rack Shelf)
⎯This User's Manual in CD-ROM
⎯AC Power Cord
⎯RS-232 Cable
Please notify your sales representative immediately if any of the aforementioned
items is missing or damaged.
1-3. Features
The SNMP-GSH2416 SNMP Managed Gigabit Switch, a standalone off-the-
shelf switch, provides the comprehensive features listed below for users to perform
system network administration and efficiently and securely serve your network.
• Hardware
• 8 10/100/1000Mbps Auto-negotiation Gigabit Ethernet TP ports
• 16 1000Mbps SFP fiber ports
• 400KB on-chip frame buffer
• Jumbo frame support
• Programmable classifier for QoS (Layer 4/Multimedia)
• 8K MAC address and 4K VLAN support (IEEE802.1Q)
• Per-port shaping, policing, and Broadcast Storm Control
• IEEE802.1Q-in-Q nested VLAN support
• Full-duplex flow control (IEEE802.3x) and half-duplex backpressure
• Extensive front-panel diagnostic LEDs; System: Power, TP Port1-8: LINK/ACT,
SPEED, SFP Port 9-24: SFP(LINK/ACT)
• Management
•Supports concisely the status of port and easily port configuration
•Supports per port traffic monitoring counters
• Supports a snapshot of the system Information when you login
• Supports port mirror function
• Supports the static trunk function

5 AirLive SNMP-GSH 2416 User's Manual
• Supports 802.1Q VLAN
• Supports user management and limits three users to login
• Maximal packet length can be up to 9216 bytes for jumbo frame application
• Supports DHCP Broadcasting Suppression to avoid network suspended or
crashed
• Supports to send the trap event while monitored events happened
•Supports default configuration which can be restored to overwrite the current
configuration which is working on via web browser and CLI
• Supports on-line plug/unplug SFP modules
• Supports Quality of Service (QoS) for real time applications based on the
information taken from Layer 2 to Layer 4, such as VoIP
• Built-in web-based management and CLI management, providing a more
convenient UI for the user
• Supports port mirror function with ingress traffic
•Supports rapid spanning tree (802.1w RSTP)
• Supports 802.1X port security on a VLAN
• Supports user management and only first login administrator can configure the
device. The rest of users can only view the switch
• SNMP access can be disabled and prevent from illegal SNMP access
• Supports Ingress, Non-unicast and Egress Bandwidth rating management with
a resolution of 1Mbps
• The trap event and alarm message can be transferred via e-mail and mobile
phone short message
• Supports diagnostics to let administrator knowing the hardware status
•Supports external loopback test to check if the link is ok
• TFTP for firmware upgrade, system log upload and config file import/export
• Supports remote boot the device through user interface and SNMP
• Supports network time synchronization and daylight saving
• Supports 120 event log records in the main memory and display on the local
console

6 AirLive SNMP-GSH2416 User’s Manual
1-4. View of SNMP-GSH2416 SNMP Managed Gigabit Switch
1-4-1. User Interfaces on the Front Panel (Button, LEDs and Plugs)
There are 8 TP Gigabit Ethernet ports and 16 SFP fiber ports for optional
removable modules on the front panel of the switch. LED display area, locating on
the left side of the panel, contains a Power LED, which indicates the power status
and 24 ports working status of the switch.
Fig. 1-1 Full View of 8-Port TP + 16-Port SFP L2 Managed Gigabit Switch
Fig. 1-2 Front View of 8-Port TP + 16-Port SFP L2 Managed Gigabit Switch
RESET Button:
RESET button is used to
reset the management
system.
Power Indication LED
Gigabit Ethernet Port
TP Port Status Indication LEDs SFP Fiber Port
Fiber Port Status Indication LEDs

7 AirLive SNMP-GSH 2416 User's Manual
• LED Indicators
LED Color Function
System LED
POWER Green Lit when +5V DC power is on and good
CPU LED Green Blinks when CPU is activity
10/100/1000Ethernet TP Port 1 to 8 LED
LINK/ACT Green Lit when connection with remote device is good
Blinks when any traffic is present
Off when cable connection is not good
SPEED Green/
Ember
Lit green when 1000Mbps speed is active
Lit ember when 100Mbps speed is active
Off when 10Mbps speed is active
1000SX/LX Gigabit Fiber Port 9 to 24 LED
SFP(LINK/ACT) Green Lit when connection with the remote device is good
Blinks when any traffic is present
Off when module connection is not good
Table1-1
1-4-2. User Interfaces on the Rear Panel
One RS-232 DB-9 interface is offered for configuration or management.
Fig. 1-3 Rear View of 8-Port TP + 16-Port SFP L2 Managed Gigabit Switch
RS-232 DB-9 Connector
AC Line 100-240V 50/60 Hz

8 AirLive SNMP-GSH2416 User’s Manual
1-5. View of the Optional Modules
In the switch,1000Mbps SFP Fiber transceiver is used for high-speed
connection expansion; the following are optional SFP types provided for the switch:
⎯1000Mbps LC, MM, SFP Fiber transceiver (SFP.0LC.202)
⎯1000Mbps LC, SM 10km, SFP Fiber transceiver (SFP.0LC.212.10)
⎯1000Mbps LC, SM 30km, SFP Fiber transceiver (SFP.0LC.212.30)
⎯1000Mbps LC, SM 50km, SFP Fiber transceiver (SFP.0LC.212.50)
⎯1000Mbps BiDi LC, type 1, SM 20km, SFP Fiber WDM transceiver
(SFP.0BL.621.201)
⎯1000Mbps BiDi LC, type 2, SM 20km, SFP Fiber WDM transceiver
(SFP.0BL.621.202)
⎯1000Mbps LC, SM 10km, SFP Fiber transceiver with DDM
(SFP.DLC.212.10)
Fig. 1-4 Front View of 1000Base-SX/LX LC, SFP Fiber Transceiver
Fig. 1-5 Front View of 1000Base-LX BiDi LC, SFP Fiber Transceiver

9 AirLive SNMP-GSH 2416 User's Manual
2. Installation
2-1. Starting SNMP-GSH2416 SNMP Managed Gigabit
Switch Up
This section will give users a quick start for:
- Hardware and Cable Installation
- Management Station Installation
- Software booting and configuration
2-1-1. Hardware and Cable Installation
At the beginning, please do first:
⇒Wear a grounding device to avoid the damage from electrostatic discharge
⇒Be sure that power switch is OFF before you insert the power cord to power
source
• Installing Optional SFP Fiber Transceivers to the Switch
Note: If you have no modules, please skip this section.
•Connecting the SFP Module to the Chassis:
The optional SFP modules are hot swappable, so you can plug or unplug it
before or after powering on.
1. Verify that the SFP module is the right model and conforms to the chassis
2. Slide the module along the slot. Also be sure that the module is properly
seated against the slot socket/connector
3. Install the media cable for network connection
4. Repeat the above steps, as needed, for each module to be installed into
slot(s)
5. Have the power ON after the above procedures are done
Fi
g
. 2-1 Installation of O
p
tional SFP Fiber Transceive
r

10 AirLive SNMP-GSH2416 User’s Manual
• TP Port and Cable Installation
⇒In the switch, TP port supports MDI/MDI-X auto-crossover, so both types of
cable, straight-through (Cable pin-outs for RJ-45 jack 1, 2, 3, 6 to 1, 2, 3, 6 in
10/100M TP; 1, 2, 3, 4, 5, 6, 7, 8 to 1, 2, 3, 4, 5, 6, 7, 8 in Gigabit TP) and
crossed-over (Cable pin-outs for RJ-45 jack 1, 2, 3, 6 to 3, 6, 1, 2) can be used.
It means you do not have to tell from them, just plug it.
⇒Use Cat. 5 grade RJ-45 TP cable to connect to a TP port of the switch and the
other end is connected to a network-aware device such as a workstation or a
server.
⇒Repeat the above steps, as needed, for each RJ-45 port to be connected to a
Gigabit 10/100/1000 TP device.
Now, you can start having the switch in operation.
• Power On
The switch supports 100-240 VAC, 50-60 Hz power supply. The power
supply will automatically convert the local AC power source to DC power. It does not
matter whether any connection plugged into the switch or not when power on, even
modules as well. After the power is on, all LED indicators will light up immediately
and then all off except the power LED still keeps on. This represents a reset of the
system.
• Firmware Loading
After resetting, the bootloader will load the firmware into the memory. It will
take about 30 seconds, after that, the switch will flash all the LED once and
automatically performs self-test and is in ready state.

11 AirLive SNMP-GSH 2416 User's Manual
2-1-2. Installing Chassis to a 19-Inch Wiring Closet Rail
Caution: Allow a proper spacing and proper air ventilation for the cooling fan
at both sides of the chassis.
⇒Wear a grounding device for electrostatic discharge.
⇒Screw the mounting accessory to the front side of the switch (See Fig. 2-2).
⇒Place the Chassis into the 19-inch wiring closet rail and locate it at the proper
position. Then, fix the Chassis by screwing it.
2-1-3. Cabling Requirements
To help ensure a successful installation and keep the network performance
good, please take a care on the cabling requirement. Cables with worse
specification will render the LAN to work poorly.
Fig. 2-2

12 AirLive SNMP-GSH2416 User’s Manual
2-1-3-1. Cabling Requirements for TP Ports
⇒For Fast Ethernet TP network connection
⎯The grade of the cable must be Cat. 5 or Cat. 5e with a maximum length of
100 meters.
⇒Gigabit Ethernet TP network connection
⎯The grade of the cable must be Cat. 5 or Cat. 5e with a maximum length of
100 meters. Cat. 5e is recommended.
2-1-3-2. Cabling Requirements for 1000SX/LX SFP Module
It is more complex and comprehensive contrast to TP cabling in the fiber
media. Basically, there are two categories of fiber, multi mode (MM) and single
mode (SM). The later is categorized into several classes by the distance it supports.
They are SX, LX, LHX, XD, and ZX. From the viewpoint of connector type, there
mainly are LC and BIDI LC.
⎯Gigabit Fiber with multi-mode LC SFP module
⎯Gigabit Fiber with single-mode LC SFP module
⎯Gigabit Fiber with BiDi LC 1310nm SFP module
⎯Gigabit Fiber with BiDi LC 1550nm SFP module
The following table lists the types of fiber that we support and those else not
listed here are available upon request.
Multi-mode Fiber Cable and Modal Bandwidth
Multi-mode 62.5/125μm Multi-mode 50/125μm
Modal
Bandwidth Distance Modal Bandwidth Distance
160MHz-Km 220m 400MHz-Km 500m
IEEE 802.3z
Gigabit Ethernet
1000SX 850nm
200MHz-Km 275m 500MHz-Km 550m
Single-mode Fiber 9/125μm
Single-mode transceiver 1310nm 10Km
1000Base-
LX/LHX/XD/ZX Single-mode transceiver 1550nm 30, 50Km
TX(Transmit) 1310nm
Single-Mode
*20Km RX(Receive) 1550nm
TX(Transmit) 1550nm
1000Base-LX
Single Fiber
(BIDI LC) Single-Mode
*20Km RX(Receive) 1310nm
Table2-1

13 AirLive SNMP-GSH 2416 User's Manual
2-1-3-3. Switch Cascading in Topology
• Takes the Delay Time into Account
Theoretically, the switch partitions the collision domain for each port in switch
cascading that you may up-link the switches unlimitedly. In practice, the network
extension (cascading levels & overall diameter) must follow the constraint of the
IEEE 802.3/802.3u/802.3z and other 802.1 series protocol specifications, in which
the limitations are the timing requirement from physical signals defined by 802.3
series specification of Media Access Control (MAC) and PHY, and timer from some
OSI layer 2 protocols such as 802.1d, 802.1q, LACP and so on.
The fiber, TP cables and devices’ bit-time delay (round trip) are as follows:
1000Base-X TP, Fiber 100Base-TX TP 100Base-FX Fiber
Round trip Delay: 4096 Round trip Delay: 512
Cat. 5 TP Wire: 11.12/m Cat. 5 TP Wire: 1.12/m Fiber Cable: 1.0/m
Fiber Cable : 10.10/m TP to fiber Converter: 56
Bit Time unit : 1ns (1sec./1000 Mega bit) Bit Time unit: 0.01μs (1sec./100 Mega bit)
Table 2-2
Sum up all elements’ bit-time delay and the overall bit-time delay of
wires/devices must be within Round Trip Delay (bit times) in a half-duplex network
segment (collision domain). For full-duplex operation, this will not be applied. You
may use the TP-Fiber module to extend the TP node distance over fiber optic and
provide the long haul connection.
• Typical Network Topology in Deployment
A hierarchical network with minimum levels of switch may reduce the timing
delay between server and client station. Basically, with this approach, it will
minimize the number of switches in any one path; will lower the possibility of
network loop and will improve network efficiency. If more than two switches are
connected in the same network, select one switch as Level 1 switch and connect all
other switches to it at Level 2. Server/Host is recommended to connect to the Level
1 switch. This is general if no VLAN or other special requirements are applied.

14 AirLive SNMP-GSH2416 User’s Manual
Case1: All switch ports are in the same local area network. Every port can access
each other (See Fig. 2-3).
If VLAN is enabled and configured, each node in the network that can
communicate each other directly is bounded in the same VLAN area.
Here VLAN area is defined by what VLAN you are using. The switch
supports both port-based VLAN and tag-based VLAN. They are different in practical
deployment, especially in physical location. The following diagram shows how it
works and what the difference they are.
Case2a: Port-based VLAN (See Fig.2-4).
1. The same VLAN members could not be in different switches.
2. Every VLAN members could not access VLAN members each other.
3. The switch manager has to assign different names for each VLAN groups
at one switch.
Fi
g
. 2-3 No VLAN Confi
g
uration Dia
g
ram
Fig. 2-4 Port-based VLAN Diagram

15 AirLive SNMP-GSH 2416 User's Manual
Case 2b: Port-based VLAN (See Fig.2-5).
1. VLAN1 members could not access VLAN2, VLAN3 and VLAN4 members.
2. VLAN2 members could not access VLAN1 and VLAN3 members, but they could
access VLAN4 members.
3. VLAN3 members could not access VLAN1, VLAN2 and VLAN4.
4. VLAN4 members could not access VLAN1 and VLAN3 members, but they could
access VLAN2 members.
Case3a: The same VLAN members can be at different switches with the same VID
(See Fig. 2-6).
Fig. 2-5 Port-based VLAN Diagram

16 AirLive SNMP-GSH2416 User’s Manual
2-1-4. Configuring the Management Agent of SNMP-GSH2416 SNMP
Managed Gigabit Switch
We offer you three ways to startup the switch management function. They
are RS-232 console, CLI, and Web. Users can use any one of them to monitor and
configure the switch. You can touch them through the following procedures.
Section 2-1-4-1: Configuring the Management Agent of SNMP-GSH2416 SNMP
Managed Gigabit Switch through the Serial RS-232 Port
Section 2-1-4-2: Configuring the Management Agent of SNMP-GSH2416 SNMP
Managed Gigabit Switch through the Ethernet Port
Note: Please first modify the IP address, Subnet mask, Default gateway and DNS
through RS-232 console, and then do the next.