3Com 4007, Implementation Manual, Page: 245 / 684

VLAN Overview 245
Features Your Switch 4007 supports the VLAN features listed in Table 48.
Table 48 VLAN Features
Feature
Layer 2
Modules and
Switch Fabric
Module
Multilayer
Modules
Description
VLAN
mode:
allOpen or
allClosed Yes Yes On a per-module basis, establishes a less-restrictive VLAN
environment (allOpen mode) or a more secure VLAN
environment (allClosed mode). The VLAN mode dictates the
requirements for the port-, protocol-, and network-based VLANs.
See “VLAN allOpen or allClosed Mode” later in this chapter.
Per-port
IEEE
802.1Q
tagging Yes Yes On a per-port basis, dictates that transmitted frames are
encapsulated and tagged as specified in the IEEE 802.1Q
standard and that received frames must be encapsulated and
tagged. See the sections on port-, protocol-, and network-based
VLANs later in this chapter for specific information on tagging for
the different types of VLANs.
Port-based
VLANS Yes Yes Determine VLAN membership based solely on the port on which
the frame was received. The system provides a special port-based
VLAN by default, with all ports of all modules, called the
default
VLAN.
The system also supports static VLAN configuration for both
Layer 2 and Multilayer Switching Modules, and
dynamic
port-based VLAN configuration for Multilayer Switching
Modules. See “User-Configured Port-based VLANs” and
“Dynamic Port-based VLANs Using GVRP” later in this chapter for
information on static and dynamic VLAN configuration.
Protocol-
based
VLANs No Yes Determine VLAN membership based on the port on which the
frame was received, as well as the protocol of the frame. You can
use the protocol-based VLANs (and applied routing interfaces) to
establish routing between VLANs. See “Protocol-based VLANs”
later in this chapter.
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 automatically
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
VLANs (IP
only) No Yes Determine IP VLAN membership based on the port on which the
frame was received, as well as the IP protocol and destination
network address of the frame. See “Network-based IP VLANs”
later in this chapter.
.