TRENDnet TL2-FG142, Руководство пользователя

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TRENDnet User’s Guide
TL2-FG142
1
1. Introduction
TL2-FG142 supports 14 fiber ports SFP type with 100/1000M bps and 2 RJ-45 Copper
port with adaptive 10/100/1000M bps.
1.1 Introduction of the management functions
The Switch supports in-band management function from Http/Telnet/SNMP interfaces.
Console is supported for local command-line settings. It supports network configuration
functions, like VLAN, Trunking, Port Mirror, QoS, spanning tree and software
backup/update. Users can configure these functions for different network applications.
The following is a brief introduction about these functions before the detail operation
sections.
1. VLAN (Virtual LAN)
VLAN can divide the switch to several broadcast domains to prevent network traffic
between different user groups. This switch supports 802.1Q tag-based VLAN and Port-
based VLAN. Users with the same VLAN ID can transfer data to each other. The
network traffic will be blocked if they have different VLAN ID. VLAN Stacking function for
802.1Q tag-based VLAN is supported. It allows two VLAN tags in a packet for 802.1Q
VLAN tunnelling application through a central network.
2. Trunk
If two switches are cascaded together, the bottleneck will happen at the cascading
connection. If more cables could be used for the cascading connection, it will reduce
the bottleneck problem. In normal case, switches will become unstable because of
traffic looping when more than one cable is connected between them. If the switches
support trunk function, they can treat these cables as one connection between them.
The traffic looping will not happen between these cables and the switches will work
stable with bigger bandwidth between them.
Notes: About redundant application
The trunk connection supports redundant function. If any trunk cable is broken, the
traffic going through that cable will be transferred to another trunk cable automatically.
For example, if traffic of user port 6 is assigned to Port 1 in a Trunk and Port 1
connection breaks, Port 2 will take over the traffic for Port 6 automatically. (It could be
used for redundant application.)
3. Spanning Tree Protocol / Rapid Spanning Tree Protocol
Spanning tree is a protocol to prevent network loop in network topology. If network
loop happens, it will cause switches in the network unstable because more and more
traffic will loop in the network. If network loop happens, spanning tree protocol will
block one connection in the loop automatically. But it will also cause a period of delay
(30 seconds for STP and shorter time for RSTP) if any network connection is changed
because of the network topology detection operation of the protocol.
Because there could be more than one switch in the network, users can configure this
function for their network spanning tree application.
4. Port Mirror
This switch operates in store-and-forward algorithm so it is not possible to monitor
network traffic from another connection port. But the port mirror function can copy
packets from some monitored port to another port for network monitor.
5. QoS
For Quality of Service request in a network, packets could be classified to different
forwarding priorities. For real-time network traffic (like video, audio), it needs higher
priority than normal network traffic. With the definition of packet priority, it could have
8 priority levels (from 0 to 7). This switch supports eight priority level queues on each
port. It could be configured for port-based, 802.1P tagged based, or DiffServ of IP
packets priority. User can define the mapping of priority values to the priority queues.
6. Static Mac ID in ARL table
The switch can learn the Mac address from user’s packets and keep these Mac address
in the ARL table for store-and-forward table lookup operation. But these Mac addresses
will be deleted from ARL table after some time when users do not send any packets to
the switch. This operation is called aging and the time is called aging time. It is about 5
minutes normally (it could be changed by users.) If users want to keep a Mac address
always in ARL table on some port, they can assign the Mac address to ARL table. These
Mac ID are called Static Mac address. This switch supports static Mac address
assignment. The static Mac address assignment will also limit the Mac address could be