Creating, Deleting, And Modifying Vlans; About The Vlan Trunking Protocol - Cisco nexus 5000 series Configuration Manual

Creating, Deleting, and Modifying VLANs

Creating, Deleting, and Modifying VLANs
VLANs are numbered from 1 to 4094. All configured ports belong to the default VLAN when you first bring
up the switch. The default VLAN (VLAN1) uses only default values. You cannot create, delete, or suspend
activity in the default VLAN.
You create a VLAN by assigning a number to it. You can delete VLANs as well as move them from the active
operational state to the suspended operational state. If you attempt to create a VLAN with an existing VLAN
ID, the switch goes into the VLAN submode but does not create the same VLAN again.
Newly created VLANs remain unused until ports are assigned to the specific VLAN. All the ports are assigned
to VLAN1 by default.
Depending on the range of the VLAN, you can configure the following parameters for VLANs (except the
default VLAN):
• VLAN name
• Shutdown or not shutdown
When you delete a specified VLAN, the ports associated to that VLAN are shut down and no traffic flows.
However, the system retains all the VLAN-to-port mapping for that VLAN, and when you reenable, or recreate,
the specified VLAN, the system automatically reinstates all the original ports to that VLAN.
Commands entered in the VLAN configuration submode are immediately executed.
Note
VLANs 3968 to 4049 and 4094 are reserved for internal use; these VLANs cannot be changed or used.

About the VLAN Trunking Protocol

VLAN Trunking Protocol (VTP) is a distributed VLAN database management protocol that synchronizes the
VTP VLAN database across domains. A VTP domain includes one or more network switches that share the
same VTP domain name and are connected with trunk interfaces.
The following are the different VTP modes:
• Server mode—Allows users to perform configurations, manage the VLAN database version, and store
• Client mode—Does not allow users to perform configurations and relies on other switches in the domain
• Off mode—Allows users to access the VLAN database (VTP is enabled) but does not participate in
• Transparent mode—Does not participate in VTP, uses local configuration, and relays VTP packets to
Cisco Nexus 5000 Series NX-OS Layer 2 Switching Configuration Guide, Release 5.1(3)N1(1)
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the VLAN database.
to provide configuration information.
VTP.
other forward ports. VLAN changes affect only the local switch. A VTP transparent network switch
does not advertise its VLAN configuration and does not synchronize its VLAN configuration based on
received advertisements.
Configuring VLANs
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