MAC-based VLAN
Status
Displays MAC-based VLAN entries
Protocol-based VLAN Configures the protocol-based VLAN entries
Protocol-based VLAN
Membership
Displays the protocol-based VLAN entries
4.6.2 IEEE 802.1Q VLAN
In large networks, routers are used to isolate broadcast traffic for each subnet into separate domains.
This Managed Switch provides a similar service at Layer 2 by using VLANs to organize any group of
network nodes into separate broadcast domains. VLANs confine broadcast traffic to the originating
group, and can eliminate broadcast storms in large networks. This also provides a more secure and
cleaner network environment.
An IEEE 802.1Q VLAN is a group of ports that can be located anywhere in the network, but
communicate as though they belong to the same physical segment.
VLANs help to simplify network management by allowing you to move devices to a new VLAN without
having to change any physical connections. VLANs can be easily organized to reflect departmental
groups (such as Marketing or R&D), usage groups (such as e-mail), or multicast groups (used for
multimedia applications such as videoconferencing).
VLANs provide greater network efficiency by reducing broadcast traffic, and allow you to make network
changes without having to update IP addresses or IP subnets. VLANs inherently provide a high level of
network security since traffic must pass through a configured Layer 3 link to reach a different VLAN.
This Managed Switch supports the following VLAN features:
Up to 255 VLANs based on the IEEE 802.1Q standard
Port overlapping, allowing a port to participate in multiple VLANs
End stations can belong to multiple VLANs
Passing traffic between VLAN-aware and VLAN-unaware devices
Priority tagging
■ IEEE 802.1Q Standard
IEEE 802.1Q (tagged) VLAN are implemented on the Switch. 802.1Q VLAN require tagging, which
enables them to span the entire network (assuming all switches on the network are IEEE
802.1Q-compliant).
VLAN allow a network to be segmented in order to reduce the size of broadcast domains. All packets
entering a VLAN will only be forwarded to the stations (over IEEE 802.1Q enabled switches) that are
members of that VLAN, and this includes broadcast, multicast and unicast packets from unknown
sources.
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