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Chapter 6: VLANs
44
VLAN Overview
This VLAN overview contains the following sections:
“VLAN Name,” next
“VLAN Identifier” on page 44
“VLAN Port Members” on page 44
“Incoming and Outgoing Tagged and Untagged Frames” on page 45
“Guidelines for Creating a VLAN” on page 46
VLAN Name To create a port-based VLAN, you must give it a name. The name should
reflect the function of the network devices that are members of the VLAN.
Examples include Sales, Production, and Engineering.
VLAN Identifier Every VLAN in a network must have a unique number assigned to it. This
number is called the VLAN identifier (VID). This number uniquely identifies
a VLAN in the switch and the network. The factory default VID is 1 for all
ports.
If a VLAN consists only of ports located on one physical switch in your
network, you assign it a VID different from all other VLANs in your
network.
If a VLAN spans multiple switches, the VID for the VLAN on the different
switches should be the same. Then the switches are able to recognize and
forward frames belonging to the same VLAN even though the VLAN spans
multiple switches.
For example, if you had a VLAN titled Marketing that spanned three
AT-GS950/8 switches, you would assign the Marketing VLAN on each
switch the same VID.
VLAN Port
Members
You need to specify which ports on the switch are members of a VLAN. A
port can be specified as a member of one or more VLANs up to 255 which
is the maximum number of VLANs supported by the switch. The factory
default VID is 1. Therefore, each port is initially configured to be a member
of VLAN 1, which is known as the default VLAN.
Note
The switch is preconfigured with the Default VLAN only. All ports on
the switch are initially members of the Default VLAN.
If a port is assigned to be a new member of a VLAN, its membership can
be defined as either tagged or untagged.
- Management 1
- Software 1
- User’s Guide 1
- Contents 3
- Contacting Allied Telesis 9
- Getting Started 11
- Starting a Management Session 12
- Figure 2. Main Page 13
- Saving Changes 14
- Quitting a Management Session 15
- Chapter 1: Getting Started 16
- Basic Switch Parameters 17
- BOOTP or DHCP 18
- Rebooting the Switch 23
- Downloading New Firmware 26
- Port Configuration 27
- Configuring Port Parameters 28
- Trunking 31
- Trunking Overview 32
- Algorithm 33
- Chapter 4: Trunking 34
- Setting up the Trunk 35
- Port Mirroring 37
- Port Mirroring Overview 38
- Configuring Port Mirroring 39
- 7. Click Apply 40
- Chapter 6 41
- VLAN Features 42
- VLAN Overview 44
- Incoming and 45
- Outgoing Tagged 45
- Guidelines for 46
- Creating a VLAN 46
- Working with VLANs 47
- Displaying all 48
- Modifying a 49
- Protected Ports VLAN 50
- Chapter 6: VLANs 52
- Class of Service 53
- Class of Service Overview 54
- Chapter 7: Class of Service 56
- Mapping Priorities to Queues 57
- Setting Up the Schedule 58
- Assigning Priority to Ports 59
- Spanning Tree Protocol (STP) 61
- Spanning Tree Overview 62
- Path Costs and Port Costs 63
- Port Priority 65
- Point-to-Point and Edge Ports 67
- Edge Port 68
- Point-to-Point and Edge Port 68
- Workstation 68
- (Full-duplex Mode) 68
- Spanning Tree 69
- Configuring Spanning Tree 71
- Configuring STP Port Settings 74
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