Information About Vlans - Cisco Nexus 9000 Series Configuration Manual

Configuring VLANs
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Information About VLANs

You can use VLANs to divide the network into separate logical areas at the Layer 2 level. VLANs can also
be considered as broadcast domains.
Any switch port can belong to a VLAN, and unicast broadcast and multicast packets are forwarded and flooded
only to end stations in that 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.
Understanding VLANs
A VLAN is a group of end stations in a switched network that is logically segmented by function 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 that VLAN. Each VLAN is considered as a logical network, and packets
destined for stations that do not belong to the VLAN must be forwarded through a router. The following figure
shows VLANs as logical networks. The stations in the engineering department are assigned to one VLAN,
Information About VLANs, page 17
Licensing Requirements for VLANs, page 21
Prerequisites for Configuring VLANs, page 22
Guidelines and Limitations for Configuring VLANs, page 22
Default Settings for VLANs, page 22
Configuring a VLAN, page 23
Verifying the VLAN Configuration, page 33
Displaying and Clearing VLAN Statistics, page 33
Configuration Example for VLANs, page 34
Additional References for VLANs, page 34
Cisco Nexus 9000 Series NX-OS Layer 2 Switching Configuration Guide, Release 7.x
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