Planet IGS-801 [50/120] Ieee 802 q vlan

User’s Manual of IGS-801M

4.5 VLANs

 VLAN Overview

A Virtual LAN (VLAN) is a logical network grouping that limits the broadcast domain. It allows you to isolate network

traffic so only members of the VLAN receive traffic from the same VLAN members. Basically, creating a VLAN from a

switch is logically equivalent of reconnecting a group of network devices to another Layer 2 switch. However, all the

network devices are still plug into the same switch physically.

The Gigabit Ethernet Switch supports IEEE 802.1Q (tagged-based) and Port-Base VLAN setting in web management

page. In the default configuration, VLAN support is “802.1Q”.

 Port-based VLAN

Port-based VLAN limit traffic that flows into a evices connected to a port are members of

r there is a single computer directly connected to a switch, or an entire

department.

On port-based VLAN.NIC do not need to be able to identify 802.1Q tags in packet headers. NIC send and receive normal

Ethernet packets. If the packet s take place using normal Ethernet

protocols. Even though this is cket lies on another switch port, VLAN

considerations come into play

 IEEE 802.1Q VLAN

IEEE 802.1Q (tagged) VLAN are implemented on the Switch. 802.1Q VLAN require tagging, which enables them to span

the entire n

VLAN allow a network to be s ins. All packets entering a VLAN will

only be forwarded to the statio es

broadcast, multicast and unic

VLAN can also provide a level of security to your network. IEEE 802.1Q VLAN will only deliver packets between stations

that are memb N

 The untagging feature of IEEE 802.1Q VLAN allows VLAN to work with legacy switches that don't recognize

VLAN tags in packet headers.

 The tagging feature allows VLAN to span multiple 802.1Q-compliant switches through a single physical

connection and allows Spanning Tree to be enabled on all ports and work normally.

Some relevant terms:

 Tagging - The act of putting 802.1Q VLAN information into the header of a packet.

 Untagging - The act of stripping 802.1Q VLAN information out of the packet header.

nd out of switch ports. Thus, all d

the VLAN(s) the port belongs to, whethe

's destination lies on the same segment, communication

always the case, when the destination for a pa

to decide if the packet is dropped by the Switch or delivered.

etwork (assuming all switches on the network are IEEE 802.1Q-compliant).

egmented in order to reduce the size of broadcast doma

ns (over IEEE 802.1Q enabled switches) that are members of that VLAN, and this includ

ast packets from unknown sources.

ers of the VLA . Any port can be configured as either tagging or untagging: