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Allied Telesis AT-GS950-24 Manual

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Chapter 5: Virtual LANs
78
Each port of a port-based VLAN can belong to as many VLANs as
needed. Therefore, traffic can be forwarded to the members of the groups
to which the port is assigned. For example, port 1 and port 2 are members
of group 1 and ports 1 and 3 are members of group 2. In this case, traffic
from port 1 is forwarded to ports 2 and 3, traffic from port 2 is forwarded
only to port 1, and traffic from port 3 is forwarded only to port 1.
General Rules for Creating a Port-based VLAN
Here is a summary of general rules to observe when creating a port-based
VLAN:
Assign a unique name to each port-based VLAN.
Assign a unique VLAN Index to each port-based VLAN. If a
particular port-based VLAN spans multiple switches, each part of
the VLAN on the different switches must be assigned the same
VLAN ind ex.
Create up to 52 port-based VLANs.
Tagged VLAN
Overview
The second type of VLAN supported by the AT-S109 Version 1.1.0
Management software is the tagged VLAN. In this type of VLAN,
membership is determined by tag information within the frames that are
received on a port and the VLAN configuration of each port.
The VLAN information within an Ethernet frame is referred to as a tag and
is contained in a tagged header for the frame. A tag, which follows the
source and destination addresses in a frame, contains the VLAN ID of the
VLAN to which the frame belongs (IEEE 802.3ac standard). This number
uniquely identifies each VLAN in a network.
When a switch receives a frame with a VLAN tag, referred to as a tagged
frame, the switch forwards the frame only to those ports whose VLAN ID
equals the VLAN tag.
A port that receives or transmits tagged frames is referred to as a tagged
port. Any network device connected to a tagged port must be IEEE
802.1Q-compliant. This is the standard that outlines the requirements and
standards for VLAN tagging. The device must be able to process the
tagged information on received frames and add tagged information to
transmitted frames.
A tagged VLAN consists of the following:
VLAN Index
You must assign a unique number to each tagged VLAN in a network.
This number is called the tagged VLAN ID. This number uniquely identifies
a tagged VLAN in the AT-GS950/24 switch and across the network.
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