About The Vlan Trunking Protocol; Guidelines And Limitations For Vtp - Cisco Nexus 6000 Series Configuration Manual

About the VLAN Trunking Protocol

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.
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. Each switch can be in only one VTP domain.
Layer 2 trunk interfaces, Layer 2 port channels, and virtual port channels (vPCs) support VTP functionality.
You can configure VTP in client or server mode. In previous releases, VTP worked only in transparent mode.
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

Guidelines and Limitations for VTP

VTP has the following configuration guidelines and limitations:
• When a switch is configured as a VTP client, you cannot create VLANs on the switch in the range of 1
• VLAN 1 is required on all trunk ports used for switch interconnects if VTP is supported in the network.
• If you enable VTP, you must configure either version 1 or version 2.
• If system vlan long-name knob is enabled, then VTP configurations will come up in OFF mode and
• The show running-configuration command does not show VLAN or VTP configuration information
• Private VLANs (PVLANs) are supported only when the switch is in transparent mode.
Cisco Nexus 6000 Series NX-OS Layer 2 Switching Configuration Guide, Release 7.x
10
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.
to 1005.
Disabling VLAN 1 from any of these ports prevents VTP from functioning properly.
users can change the mode to Transparent. However, changing the mode to Server or Client is not
allowed.
for VLANs 1 to 1000.
Configuring VLANs