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Virtual LANs (VLANs)
4-5
Connecting Common VLANs Between Switches
In the Switch 1005, VLANs are typically connected to other Switch 1005
modules, SuperStack II Switch 1000 units and SuperStack II Switch 3000
units using backbone ports. Similar to the router connections, you
normally require one backbone port per VLAN. However, to make the
Switch-to-Switch connections more cost-effective, the Switch 1005
allows you to specify that one backbone port forms part of a Virtual
LAN Trunk (VLT). A VLT is a connection which carries traffic for multiple
VLANs between Switch modules and units. If you configure both ends
of a Switch-to-Switch connection as part of a VLT, you only need that
one connection for all the VLANs.
VLTs can only be used for links between Switch 1005 modules,
SuperStack II Switch 1000 units and SuperStack II Switch 3000 units. You
cannot use VLTs for Switch-router links.
If you specify that a backbone port on one VLAN is part of a VLT, that
backbone port will become a backbone port for all the VLANs on the
Switch — even if they had no backbone port before. If you then
disable the VLT function on that port, the port becomes the backbone
port for the Default VLAN (VLAN 1) and all other VLANs lose their
backbone ports.
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 will not be
able to communicate with devices in a different VLAN.
Using Unique MAC Addresses
If you connect a server with multiple network adapters to the Switch,
we recommend that you configure each network adapter with a
unique MAC address.