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Managing Virtual LANs 41
Switch 3900, and SuperStack II Switch 9300 devices differ from other
3Com devices. See the Device View online Help to resolve these
differences.
For the CoreBuilder 9000 Switch, 3Com strongly recommends that
you read the CoreBuilder 9000 Implementation Guide for information
on VLANs and other features.
The kinds of VLAN you can implement are determined by VLAN support
in the devices you manage. For modular hubs, the type of VLAN you can
implement depends on the installed switching module. For more
information, refer to the information provided with the device.
VLANs on the
CoreBuilder 9000
Your system offers a collection of interface modules that pass traffic to
one another using a central switch called the Gigabit Ethernet (GEN)
Switch Fabric Module. This switch fabric module, a 24-port Layer 2
switching module, controls the Ethernet traffic associated with its
interface modules.The switch fabric module supports the following
modules:
■
Layer 2 switching modules
— Perform Layer 2 functions. They
handle bridging and support port-based VLANs only. Available
Ethernet Layer 2 modules include the 10-port 100BASE-FX Fast
Ethernet Layer 2 switching module, the 20-port 10/100BASE-TX Fast
Ethernet Layer 2 Switching Module, and the 36-port 10/100BASE-TX
Fast Ethernet Layer 2 Switching Module. These modules have two
backplane ports; the lower-numbered backplane port is enabled and
can be configured.
■
Layer 3 switching modules
— Perform Layer 3 as well as Layer 2
functions. They handle bridging and routing, and support port-based,
protocol-based, and network-based VLANs. Available Ethernet Layer 3
modules include the 10-port 100BASE-FX Fast Ethernet Layer 3
switching module and the 12-port 10/100BASE-TX Fast Ethernet
Layer 3 Switching Module. These modules have only one backplane
port and typically reside in the higher-numbered chassis slots (slots 13
through 16) that have only one port connection to the switch fabric
module.
■
Gigabit Ethernet (GEN) Interface modules
— These 2-port Gigabit
Ethernet interface modules do not perform switching; they act as a
traffic pipeline to the switch fabric module. Available GEN interface
modules include the 2-port 1000BASE-SX and 1000BASE-LX models.
You do not configure the two Gigabit Ethernet ports of the GEN