CTC Union MSW-4424C Series, Руководство пользователя

Страница: 290 / 382

Chapter 4. Web Configuration & Operation
290
CHAPTER 4
WEB OPERATION & CONFIGURATION
4.3.19 VLANs
IEEE 802.1Q VLAN (Virtual Local Area Network) is a popular and cost-effectively way to segment your networking
deployment by logically grouping devices with similar attributes irrespective of their physical connections. VLANs also
segment the network into different broadcast domains so that packets are forwarded to ports within the VLAN that
they belong. Using VLANs provides the following main benefits:
VLANs provide extra security: Devices that frequently communicate with each other are grouped into the same
VLAN. If devices in a VLAN want to communicate with devices in a different VLAN, the traffic must go through a
routing device or Layer 3 switching device.
VLANs help control traffic: Traditionally, when networks are not segmented into VLANs, congestion can be easily
caused by broadcast traffic that is directed to all devices. To minimize the possibility of broadcast traffic
damaging the entire network, VLANs can help group devices that communicate frequently with other in the same
VLAN so as to divide the entire network into several broadcast domains.
VLANs make changes of devices or relocation more easily: In traditional networks, when moving a device
geographically to a new location (for example, move a device in floor 2 to floor 4), the network administrator may
need to change the IP or even subnet of the network or require re-cabling. However, by using VLANs, the original IP
settings can remain the same and re-cabling can be reduced to minimal.
Global VLAN Configuration
Allowed Access VLANs: This shows the allowed access VLANs. This setting only affects ports set in “Access” mode.
Ports in other modes are members of all VLANs specified in “Allowed VLANs” field. By default, only VLAN 1 is specified.
More allowed access VLANs can be entered by specifying the individual VLAN ID separated by comma. If you want to
specify a range, separate it by a dash. For example, 1, 5, 10, 12-15, 100
Ethertype for Custom S-ports: Specify ether type used for customer s-ports.
Port VLAN Configuration