Introduction To Vlan; Vlan Features Supported By The S9300 - Huawei Quidway S9300 Configuration Manual

3 VLAN Configuration

3.1 Introduction to VLAN

This section describes the concept of the VLAN.
Definition of a VLAN
A local area network (LAN) can be divided into several logical LANs. Each logical LAN is a
broadcast domain, which is called a virtual LAN (VLAN). That is, the devices in a LAN are
logically divided into different LAN segments, namely, different VLANs, irrespective of their
physical locations. In this manner, the broadcast domains within a LAN are separated from each
other.
Functions of a VLAN
In VLAN networking, the devices that need to communicate with each other are added to a
VLAN; the devices that do not need to communicate with each other are added to different
VLANs. This isolates broadcast domains, eliminates broadcast storms, and improves the security
of data transmission.
With the expansion of network scales, a local network fault impacts the entire network. After
VLANs are used, a fault affects only a VLAN. This improves the network robustness.

3.2 VLAN Features Supported by the S9300

This section describes the VLAN features supported by the S9300.
Port-based VLAN
The S9300 supports port-based VLANs.
Ports on the S9300 are classified into the following types:
l
l
l
l
Table 3-1
ID.
3-2
Access: An access port can join only one VLAN, namely, the default VLAN. Access ports
are usually connected to user devices.
Trunk: A trunk port can join multiple VLANs and is usually connected to a network device.
Hybrid: A hybrid port can join multiple VLANs and can be connected to a network device
or a user device.
QinQ: A QinQ port can join only one VLAN, namely, the default VLAN. QinQ ports are
usually connected to network devices.
The differences between hybrid and trunk ports are as follows:
Hybrid ports can forward packets of multiple VLANs in untagged mode.
–
Trunk ports can forward only the packets of the default VLAN in untagged mode.
–
describes how various ports process received packets depending on the default VLAN
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Quidway S9300 Terabit Routing Switch
Configuration Guide - Ethernet
Issue 03 (2009-08-20)