Managing Virtual LANs
Chapter 4 Discovering and Managing Objects 105
Managing Virtual LANs
A virtual (or logical) LAN, referred to as a VLAN, is a local area network with a
definition that maps workstations on a basis other than geographic location (for
example, by department, type of user, or primary application). VLANs are always
discovered; you do not create them. In the navigation tree, they appear below a
VLAN root, which appears below an interface. A VLAN label uses the following
syntax:
interfaceName.VLANNumber–dataEncapStd and string
■ interfaceName: the name of the interface in the Network tree
■ VLANNumber: the number of the VLAN as declared in the router configuration
■ dataEncapStd: the standard used to encapsulate the data (such as 802.1Q)
■ string: the name as declared in the router configuration
Figure 43 shows an example of a VLAN root with two VLANS in the navigation tree:
Figure 43 Example of VLAN in the Navigation Tree
Managing VPNs
A virtual private network (VPN) provides a way to use a public telecommunication
infrastructure, such as the Internet, to provide remote offices or individual users with
secure access to their organization’s network, instead of an expensive system of
owned or leased lines dedicated to the organization. A VPN is defined by
■ a source (the local network)
■ a destination (the remote network or user)
NOTE
VLAN support is for Cisco layer-3 VLANs configured as subinterfaces on Fast
Ethernet interfaces.
