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6
VLAN C
ONFIGURATION
This chapter includes the following topics:
◆
IEEE 802.1Q VLANs – Configures static and dynamic VLANs.
◆
IEEE 802.1Q Tunneling – Configures QinQ tunneling to maintain
customer-specific VLAN and Layer 2 protocol configurations across a
service provider network, even when different customers use the same
internal VLAN IDs.
◆
Protocol VLANs – Configures VLAN groups based on specified protocols.
◆
IP Subnet VLANs – Maps untagged ingress frames to a specified VLAN if
the source address is found in the IP subnet-to-VLAN mapping table.
◆
MAC-based VLANs – Maps untagged ingress frames to a specified VLAN
if the source MAC address is found in the IP MAC address-to-VLAN
mapping table.
◆
VLAN Mirroring – Mirrors traffic from one or more source VLANs to a
target port.
IEEE 802.1Q VLAN
S
In large networks, routers are used to isolate broadcast traffic for each
subnet into separate domains. This 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 video conferencing).
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