Change The Default Vlan Id; Set The Null Vlan As The Default Vlan - Dell Force10 C150 Configuration Manual

To configure a port so that it has a native VLAN:
Step Task
1 Remove any Layer 2 or Layer 3 configurations from the interface.
If the port has any configurations on it when you enter the command portmode hybrid , FTOS rejects
the configuration, citing the following message:
2 Configure the interface for hybrid mode.
3 Configure the interface for switchport mode.
4 Add the interface as a member of one or more VLANs.

Change the Default VLAN ID

By default, VLAN 1 is the Default VLAN. You can make another VLAN the default (which then enables
you to configure VLAN 1).
Task
Make a VLAN other than VLAN 1 the default VLAN.

Set the Null VLAN as the Default VLAN

In a Carrier Ethernet for Metro Service environment, service providers who perform frequent
reconfigurations for customers with changing requirements occasionally enable multiple interfaces, each
connected to a different customer, before the interfaces are fully configured. This presents a vulnerability
because both interfaces are initially placed in the native VLAN, VLAN 1, and for that period customers are
able to access each other's networks. FTOS has a Null VLAN to eliminate this vulnerability. When you
enable the Null VLAN, all ports are placed into by it default, so that even if you activate the physical ports
of multiple customers, no traffic is allowed to traverse the links until each port is place in another VLAN.
Task
Disable the default VLAN, so that all ports belong to
the Null VLAN until configured as a member of another
VLAN.
Command
% Error: Port is in Layer-2 mode <slot/port>.
portmode hybrid
switchport
[ tagged | untagged ]
Command Syntax
default vlan-id
Command Syntax
default-vlan disable
Default: the default VLAN is enabled
no default-vlan disable
( ).
Command Mode
INTERFACE
INTERFACE
INTERFACE
VLAN INTERFACE
Command Mode
CONFIGURATION
Command Mode
CONFIGURATION
VLAN | 1107