Chapter 14: Vlan Management; Overview; Vlan Description - Cisco Small Business 200 Series Administration Manual

VLAN Management
This section covers the following topics:
•

Overview

• Regular VLANs
• Voice VLAN
Overview
A VLAN is a logical group of ports that enables devices associated with it to communicate with each other
over the Ethernet MAC layer, regardless of the physical LAN segment of the bridged network to which they
are connected.
A VLAN is a logical group of ports that enables devices associated with it to communicate with each other
over the Ethernet MAC layer, regardless of the physical LAN segment of the bridged network to which they
are connected.

VLAN Description

Each VLAN is configured with a unique VLAN ID (VID) with a value from 1 to 4094. A port on a device in a
bridged network is a member of a VLAN if it can send data to and receive data from the VLAN. A port is an
untagged member of a VLAN if all packets destined for that port into the VLAN have no VLAN tag. A port is
a tagged member of a VLAN if all packets destined for that port into the VLAN have a VLAN tag. A port can
be a member of only one untagged VLAN but can be a member of multiple tagged VLANs.
A port in VLAN Access mode can be part of only one VLAN. If it is in General or Trunk mode, the port can be
part of one or more VLANs.
VLANs address security and scalability issues. Traffic from a VLAN stays within the VLAN, and terminates at
devices in the VLAN. It also eases network configuration by logically connecting devices without physically
relocating those devices.
Cisco Small Business 200 Series Smart Switch Administration Guide
14
177