Cisco 2950G 24 Software Configuration Guide - Page 337
Configuring VLANs, Understanding VLANs
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Configuring VLANs 14 C H A P T E R This chapter describes how to configure normal-range VLANs (VLAN IDs 1 to 1005) and extended-range VLANs (VLAN IDs 1006 to 4094). It includes information about VLAN modes and the VLAN Membership Policy Server (VMPS). Note For complete syntax and usage information for the commands used in this chapter, refer to the command reference for this release. The chapter includes these sections: • Understanding VLANs, page 14-1 • Configuring Normal-Range VLANs, page 14-4 • Configuring Extended-Range VLANs, page 14-12 • Displaying VLANs, page 14-14 • Configuring VLAN Trunks, page 14-15 • Configuring VMPS, page 14-24 Understanding VLANs A VLAN is a switched network that is logically segmented by function, project team, or application, without regard to the physical locations of the users. VLANs have the same attributes as physical LANs, but you can group end stations even if they are not physically located on the same LAN segment. Any switch port can belong to a VLAN, and unicast, broadcast, and multicast packets are forwarded and flooded only to end stations in the VLAN. Each VLAN is considered a logical network, and packets destined for stations that do not belong to the VLAN must be forwarded through a router or bridge as shown in Figure 14-1. Because a VLAN is considered a separate logical network, it contains its own bridge Management Information Base (MIB) information and can support its own implementation of spanning tree. See Chapter 11, "Configuring STP" and Chapter 12, "Configuring RSTP and MSTP." Note Before you create VLANs, you must decide whether to use VLAN Trunking Protocol (VTP) to maintain global VLAN configuration for your network. For more information on VTP, see Chapter 15, "Configuring VTP." 78-14982-01 Catalyst 2950 Desktop Switch Software Configuration Guide 14-1
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