Service Manual
3. Congure the interface for Switchport mode.
INTERFACE mode
switchport
4. Add the interface to a tagged or untagged VLAN.
VLAN INTERFACE mode
[tagged | untagged]
Enabling Null VLAN as the Default VLAN
In a Carrier Ethernet for Metro Service environment, service providers who perform frequent recongurations for customers with
changing requirements occasionally enable multiple interfaces, each connected to a dierent customer, before the interfaces are fully
congured.
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. Dell Networking OS has a Null VLAN to eliminate this vulnerability. When you enable the
Null VLAN, all ports are placed into it by default, so even if you activate the physical ports of multiple customers, no trac is allowed
to traverse the links until each port is place in another VLAN.
To enable Null VLAN, use the following command.
• Disable the default VLAN, so that all ports belong to the Null VLAN until congured as a member of another VLAN.
CONFIGURATION mode
default-vlan disable
Default: the default VLAN is enabled (no default-vlan disable).
Virtual LANs (VLANs)
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