Users Guide

untagged commands in INTERFACE configuration mode (Configuring VLAN Membership). Physical Interfaces and port channels can be
members of VLANs.
NOTE: You can assign a static IP address to default VLAN 1 using the ip address command. To assign a different VLAN ID to
the default VLAN, use the default vlan-id vlan-id command.
Following table lists out the VLAN defaults in Dell Networking OS:
Table 8. VLAN Defaults
Feature Default
Mode Layer 2 (no IP address is assigned)
Default VLAN ID VLAN 1
Default VLAN
When an Aggregator boots up, all interfaces are up in Layer 2 mode and placed in the default VLAN as untagged interfaces. Only untagged
interfaces can belong to the default VLAN.
By default, VLAN 1 is the default VLAN. To change the default VLAN ID, use the default vlan-id <1–4094> command in
CONFIGURATION mode. You cannot delete the default VLAN.
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 stack units 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.
VLANs and Port Tagging
To add an interface to a VLAN, it must be in Layer 2 mode. After you place an interface in Layer 2 mode, it is automatically placed in the
default VLAN. Dell Networking OS supports IEEE 802.1Q tagging at the interface level to filter traffic. When you enable tagging, a tag
header is added to the frame after the destination and source MAC addresses. The information that is preserved as the frame moves
through the network. The below figure shows the structure of a frame with a tag header. The VLAN ID is inserted in the tag header.
Figure 15. Tagged Frame Format
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Interfaces