Features - 3Com corebuilder 3500 Implementation Manual

158 C 9: V
HAPTER IRTUAL

Features

VLAN hierarchy
LAN
S
Your system supports the following VLAN features:
Settable modes — For the entire system, you can establish a
less-restrictive VLAN environment with allOpen mode or a more secure
VLAN environment with allClosed mode. Using allClosed mode also
enables you to use another VLAN feature called Ignore STP mode. The
chosen VLAN mode dictates the requirements for the port-based,
protocol-based, and network-based VLANs. See "Terminology" for
more information about the VLAN modes and Ignore STP Mode.
Configurable types of VLANs — The system allows you to
configure different types of VLANs for controlling the flow of traffic
through a network:
Port-based VLAN — Determines VLAN membership using a
group of ports. By default, your system provides a special
port-based VLAN that contains all ports without tagging. This
special VLAN is called the default VLAN. It always uses the VLAN ID
of 1, the name
"The Default VLAN" later in this chapter for more information.
The system also supports both static and dynamic port-based VLAN
configuration if you choose to set it up that way. See "Static
Port-based VLANs" and "Dynamic Port-based VLANs Using GVRP"
later in this chapter for more information.
Protocol-based VLAN — Determines VLAN membership using a
group of ports that share one or more protocol types. In addition
to the user-defined protocol-based VLANs, the system supports a
special type of protocol-based VLAN called a router port IP VLAN.
This type of VLAN, which the system generates when you define
an IP interface as a router port IP interface, requires allClosed
mode. See "VLANs Created by Router Port IP Interfaces" later in
this chapter for more information.
Network-based VLAN — Determines IP VLAN membership for a
group of ports that are configured for IP and a specific network
address.
The VLAN type classification is hierarchical: a protocol-based VLAN is a
special type of port-based VLAN, and a network-based VLAN is a
special type of an IP protocol-based VLAN. This hierarchy allows you to
use a combination of VLAN types to group users and traffic types.
, and the protocol type unspecified. See
Default