Administrator Guide

752 VLANs
Table 21-1 provides an overview of the types of VLANs that can be used to
logically divide the network.
VLAN Tagging
Dell EMC Networking N-Series switches support IEEE 802.1Q tagging.
Ethernet frames on a tagged VLAN have a 4-byte VLAN tag in the header.
VLAN tagging is required when a VLAN spans multiple switches, which is
why trunk ports transmit and receive only tagged frames.
Table 21-1. VLAN Assignment
VLAN Assignment Description
Port-based (Static) This is the most common way to assign hosts to VLANs.
The port where the traffic enters the switch determines the
VLAN membership. Trunk ports are automatically
members of all VLANs, unless specifically configured
otherwise.
IP Subnet Hosts are assigned to a VLAN based on their IP address. All
hosts in the same subnet are members of the same VLAN.
MAC-Based The MAC address of the device determines the VLAN
assignment. This type of VLAN is useful when a host
might not always connect to the network through the same
port but needs to be on the same VLAN.
Protocol Protocol-based VLANs were developed to separate traffic
based on the layer-2 Ethertype before IP traffic became the
de facto standard in the LAN. Use a protocol-based VLAN
on networks where you might have a group of hosts that
use IPX or another legacy protocol. With protocol-based
VLANs, traffic can be segregated based on the EtherType
value in the frame.
Dynamic A data VLAN received from a RADIUS server in Access-
Accept message may be dynamically created if it does not
already exist. The VLAN exists for the duration of the
authentication session and is removed when the session
terminates, unless converted to a static VLAN. Dynamic
VLANs become members of trunk ports.