CTC Union GSW-3208M, Руководство пользователя

Страница: 14 / 148

Chapter 6. Manage / Configure the Switch
14
Chapter 6. Manage / Configure the Switch
6.1 Introduction of the management functions
This switch is a L2 Managed switch. It 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, Port
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 tunneling application
through a central network (Q in Q).
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 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.)