574 Configuring VLANs
Table 21-1 provides an overview of the types of VLANs you can use to
logically divide the network.
Switchport Modes
You can configure each port on a PowerConnect 7000 Series switch to be in
one of the following modes:
• Access — Access ports are intended to connect end-stations to the system,
especially when the end-stations are incapable of generating VLAN tags.
• Trunk — Trunk-mode ports are intended for Switch-to-Switch links, where
in general all traffic is tagged.
• General — General ports can be either access or trunk ports.
VLAN membership rules that apply to a port are based on the switchport
mode configured for the port. Table 21-2 shows the behavior of the three
switchport modes.
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.
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 protocol type 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, you can segregate traffic based on the EtherType
value in the frame.
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