Introduction To Vlan; Vlan Features Supported By The Ar3200 - Huawei AR3200 Series Configuration Manual - Lan

Huawei AR3200 Series Enterprise Routers
Configuration Guide - LAN

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 type of networking isolates broadcast domains, eliminates broadcast storms, and
improves the security of data transmission.
As network scales expand, the entire network is becoming more susceptible to faults that
originate on local networks. VLAN networking minimizes the impact of the fault to each VLAN,
which improves network robustness.

3.2 VLAN Features Supported by the AR3200

This section describes the VLAN features supported by the AR3200.
Port-based VLAN
The AR3200 supports port-based VLANs.
Ports on the AR3200 are classified into the following types:
l
l
l
Table 3-1
Issue 02 (2012-03-30)
Access: An access port can join only one VLAN (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.
The differences between hybrid and trunk ports are as follows:
– Hybrid ports can forward packets from multiple VLANs in untagged mode.
– Trunk ports can forward only the packets from the default VLAN in untagged mode.
describes how various ports process packets depending on the VLAN ID.
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3 VLAN Configuration
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