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Appendix C. Virtual LANs
The appendix describes how to set up a virtual LAN (VLAN).
Creating a Virtual LAN
A virtual LAN (VLAN) is a logical grouping of network devices put together as a
LAN regardless of their physical grouping or collision domains. VLANs lets a user
see and access only specified network segments. This increases network
performance and improves network security.
VLANs offer the ability to group users and devices together into logical workgroups.
This can simplify network administration when connecting clients to servers that are
geographically dispersed across the building, campus, or enterprise network.
Typically, VLANs consist of co-workers within the same department but in different
locations, groups of users running the same protocol, or a cross-functional team
working on a joint project.
Normally, VLANs are configured at the switch and any computer can be a member
of one VLAN per installed network adapter. The Netfinity 10/100 Ethernet Adapter
supersedes this by communicating directly with the switch, allowing multiple VLANs
on a single network adapter (up to 64 VLANs).
To set up VLAN membership, your adapter must be attached to a switch that has
VLAN capability. You also need to use Windows NT 4.0 or later, or Novell NetWare
4.1x or later.
For more information about VLANs, refer to the switch documentation or the VLAN
readme files on the IBM Installation and Drivers CD.
General Configuration Notes
v Windows NT versions prior to 4.0 do not support VLANs.
v VLANs require NT 4.0 with Service Pack 3.0 and the NDIS driver hotfix from
v In Windows NT, VLANs cannot be implemented on adapters that have been
Joining a VLAN from Windows NT 4.0
1. Create a VLAN on the switch. Use the parameters you assign there to join the
2. Double-click the Network icon in Control Panel window.
3. On the Adapters tab, select the adapter you want to be on the VLAN and select
4. In IBMSet, select Join VLAN. Note that VLANs cannot be assigned to adapters
5. Enter the VLAN ID and VLAN name. The VLAN ID must match the VLAN ID of
© Copyright IBM Corp. 1998, 1999
Microsoft.
configured for teaming options. NetWare can support teaming options and VLANs
on the same adapters.
VLAN from the server. Refer to your switch documentation for more information.
Properties.
that are already defined to have an adapter teaming option.
the switch. The ID range is from 1 to 1000. The VLAN name is for information
only and does not need to match the name on the switch.
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Troubleshooting
