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VLAN Colors
Performance
Network Management
Communication Between VLANs
VLAN Colors
Cisco 1710 Security Router Software Configuration Guide
3-4
The logical grouping of users allows an accounting group to make intensive use
of a networked accounting system assigned to a VLAN that contains just that
accounting group and its servers. That group's work will not affect other users.
The VLAN configuration improves general network performance by not slowing
down other users sharing the network.
The logical grouping of users allows easier network management. It is not
necessary to pull cables to move a user from one network to another. Adds,
moves, and changes are achieved by configuring a port into the appropriate
VLAN.
Communication between VLANs is accomplished through routing, and the
traditional security and filtering functions of the router can be used. Cisco IOS
software provides network services such as security filtering, quality of service
(QoS), and accounting on a per VLAN basis. As switched networks evolve to
distributed VLANs, Cisco IOS provides key inter-VLAN communications and
allows the network to scale.
VLAN switching is accomplished through frame tagging, in which traffic
originating and contained within a particular virtual topology carries a unique
VLAN identifier (VLAN ID) as it traverses a common backbone or trunk link.
The VLAN ID enables VLAN switching devices to make intelligent forwarding
decisions based on the embedded VLAN ID. Each VLAN is differentiated by a
color, or VLAN identifier. The unique VLAN ID determines the frame coloring
for the VLAN. Packets originating and contained within a particular VLAN carry
the identifier that uniquely defines that VLAN (by the VLAN ID).
Chapter 3
Overview of Routing Between Virtual LANs
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