Users Guide

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The only way to remove an interface from the Default VLAN is to place the interface in Default mode by using the no switchport
command in INTERFACE mode.
Assigning an IP Address to a VLAN
VLANs are a Layer 2 feature. For two physical interfaces on dierent VLANs to communicate, assign an IP address to the VLANs to
route trac between the two interfaces.
The shutdown command in INTERFACE mode does not aect Layer 2 trac on the interface; the shutdown command only
prevents Layer 3 trac from traversing over the interface.
NOTE: You cannot assign an IP address to the Default VLAN (VLAN 1). To assign another VLAN ID to the Default VLAN,
use the default vlan-id vlan-id command.
In Dell Networking OS, you can place VLANs and other logical interfaces in Layer 3 mode to receive and send routed trac. For more
information, refer to Bulk Conguration.
To assign an IP address, use the following command.
• Congure an IP address and mask on the interface.
INTERFACE mode
ip address ip-address mask [secondary]
– ip-address mask — Enter an address in dotted-decimal format (A.B.C.D) and the mask must be in slash format (/24).
– secondary — This is the interface’s backup IP address. You can congure up to eight secondary IP addresses.
Enabling Null VLAN as the Default VLAN
In a Carrier Ethernet for Metro Service environment, service providers who perform frequent recongurations for customers with
changing requirements occasionally enable multiple interfaces, each connected to a dierent customer, before the interfaces are fully
congured.
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 trac 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 congured as a member of another VLAN.
CONFIGURATION mode
default-vlan disable
Default: the default VLAN is enabled (no default-vlan disable).
Conguring Native VLANs
Traditionally, ports can be either untagged for membership to one VLAN or tagged for membership to multiple VLANs.
You must connect an untagged port to a VLAN-unaware station (one that does not understand VLAN tags) and connect a tagged
port to a VLAN-aware station (one that generates and understands VLAN tags).
Virtual LANs (VLANs)
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