3Com 1000, User Manual

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Virtual LANs (VLANs) 5-5
For information about how to set up VLANs using
AutoSelect VLAN Mode, refer to
Chapter 5 on
page 5-11 .
For more information about the VLAN Server data-
base, refer to the documentation supplied with
3Com’s Transcend Enterprise Manager.
Using Non-routable Protocols
If you are running non-routable protocols on your
network (for example, DEC LAT or NET BIOS),
devices within one VLAN are not able to communi-
cate with devices in a different VLAN.
Using Unique MAC Addresses
If you connect a server with multiple network adapt-
ers to the Switch, we recommend that you config-
ure each network adapter with a unique MAC
address.
Extending VLANs into an ATM Network
If the Switch has an ATM OC-3c Module installed,
you can extend the VLANs you have defined in
your existing network into an ATM network. For
more information, refer to the “
SuperStack II
Switch ATM OC-3c Module User Guide” .
VLAN Configurations
You can set up VLAN configurations more easily if
you use 3Com’s Transcend Enterprise Manager appli-
cations for all the management tasks.
Example 1
The example shown in Figure 5-5 illustrates a
simple VLAN configuration with a single Switch
1000 whose ports are divided between two VLANs.
VLAN 1 is able to talk to VLAN 2 using the connec-
tion between each VLAN and the router.
To set up this configuration:
1
Use the VT100 screens or VLAN Server database to:
a
Place ports 1–6 and 13–18 in VLAN 1.
b
Place ports 7–12 and 19–24 in VLAN 2.
2
Connect a port in VLAN 1 to the router.
3
Connect a port in VLAN 2 to the router.
Figure 5-5 VLAN configuration with a single Switch 1000 unit