Dell S3048-ON, Configuration Manual

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Default VLAN
When you configure interfaces for Layer 2 mode, they are automatically placed in the Default VLAN as untagged interfaces. Only untagged
interfaces can belong to the Default VLAN.
The following example displays the outcome of placing an interface in Layer 2 mode. To configure an interface for Layer 2 mode, use the
switchport
command. As shown in bold, the
switchport
command places the interface in Layer 2 mode and the
show vlan
command in EXEC privilege mode indicates that the interface is now part of the Default VLAN (VLAN 1).
By default, VLAN 1 is the Default VLAN. To change that designation, use the
default vlan-id
command in CONFIGURATION mode.
You cannot delete the Default VLAN.
NOTE: You cannot assign an IP address to the Default VLAN. To assign an IP address to a VLAN that is currently the Default
VLAN, create another VLAN and assign it to be the Default VLAN. For more information about assigning IP addresses, refer to
Assigning an IP Address to a VLAN .
• Untagged interfaces must be part of a VLAN. To remove an untagged interface from the Default VLAN, create another VLAN and place
the interface into that VLAN. Alternatively, use the
no switchport
command, and Dell Networking OS removes the interface from
the Default VLAN.
• A tagged interface requires an additional step to remove it from Layer 2 mode. Because tagged interfaces can belong to multiple
VLANs, remove the tagged interface from all VLANs using the
no tagged interface
command. Only after the interface is
untagged and a member of the Default VLAN can you use the
no switchport
command to remove the interface from Layer 2
mode. For more information, refer to VLANs and Port Tagging .
Example of Configuring an Interface for Layer 2 Belonging to the Default VLAN
Dell(conf)#interface gigabitethernet 1/2
Dell(conf-if)#no shut
Dell(conf-if)# switchport
Dell(conf-if)#show config
!
interface GigabitEthernet 1/2
no ip address
switchport
no shutdown
Dell(conf-if)#end
Dell# show vlan
Codes: * - Default VLAN, G - GVRP VLANs
NUM Status Q Ports
* 1 Active U Gi 1/2
T Gi 1/1
Port-Based VLANs
Port-based VLANs are a broadcast domain defined by different ports or interfaces. In Dell Networking OS, a port-based VLAN can contain
interfaces from different line cards within the chassis. Dell Networking OS supports 4094 port-based VLANs.
Port-based VLANs offer increased security for traffic, conserve bandwidth, and allow switch segmentation. Interfaces in different VLANs
do not communicate with each other, adding some security to the traffic on those interfaces. Different VLANs can communicate between
each other by means of IP routing. Because traffic is only broadcast or flooded to the interfaces within a VLAN, the VLAN conserves
bandwidth. Finally, you can have multiple VLANs configured on one switch, thus segmenting the device.
Interfaces within a port-based VLAN must be in Layer 2 mode and can be tagged or untagged in the VLAN ID.
872 Virtual LANs (VLANs)