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B-1
v1.0, July 2009
Appendix B
Configuration Examples
This chapter contains information about how to configure the following features:
• “Virtual Local Area Networks (VLANs)” on page B-1
• “Access Control Lists (ACLs)” on page B-4
• “Access Control Lists (ACLs)” on page B-4
• “802.1X” on page B-8
• “MSTP” on page B-11
Virtual Local Area Networks (VLANs)
A local area network (LAN) can generally be defined as a broadcast domain. Hubs, bridges, or
switches in the same physical segment or segments connect all end node devices. End nodes can
communicate with each other without the need for a router. Routers connect LANs together,
routing the traffic to the appropriate port.
A virtual LAN (VLAN) is a local area network with a definition that maps workstations on some
basis other than geographic location (for example, by department, type of user, or primary
application). To enable traffic to flow between VLANs, traffic must go through a router, just as if
the VLANs were on two separate LANs.
A VLAN is a group of PCs, servers, and other network resources that behave as if they were
connected to a single network segment—even though they might not be. For example, all
marketing personnel might be spread throughout a building. Yet if they are all assigned to a single
VLAN, they can share resources and bandwidth as if they were connected to the same segment.
The resources of other departments can be invisible to the marketing VLAN members, accessible
to all, or accessible only to specified individuals, depending on how the IT manager has set up the
VLANs.