Vlans And The Switch 3000 10/100; The Default Vlan And Moving Ports From The Default Vlan; Connecting Vlans To A Router; Connecting Common Vlans Between Switch Units - 3Com SuperStack II Switch 3000 10/100 User Manual

VLANs and the Switch 3000 10/100

The Switch 3000 10/100 supports VLANs which
consist of a set of switch ports. Each switch port
can only belong to one VLAN at a time, regardless
of the device to which it is attached.
Each Switch 3000 10/100 can support up to 16
VLANs. However, you can have more than 16 VLANs
in your entire network; to do this, you connect the
16 Switch VLANs to other VLANs using a router.
The Default VLAN and Moving Ports From the
Default VLAN
On each Switch, VLAN 1 is the Default VLAN; it has
two properties:
It contains all the ports on a new or initialized
Switch
It is the only VLAN which allows an SNMP Net-
work Manager to access the management agent
of the Switch
By default, if a device is attached to a port in the
Default VLAN and you want to move the device into
another VLAN, you need to use the VLAN Setup
screen to place the port in that VLAN. For more
information about the VLAN Setup screen, refer to
"Setting up VLANs on the Switch 3000 10/100"
page 5-8.

Connecting VLANs to a Router

If the devices of a VLAN need to talk to devices in a
different VLAN, each VLAN requires a connection to
a router. Communication between VLANs can only
take place if they are all connected to the router. A
VLAN not connected to a router is an isolated
VLAN. You need one port for each VLAN connected
to the router.
Connecting Common VLANs Between Switch
Units
If you want to connect the VLANs on the Switch
3000 10/100 with the same VLANs on another
Switch unit, you can set up one link per VLAN.
Alternatively, you can set up a single link for all the
VLANs by creating a Virtual LAN Trunk (VLT). A VLT
is a Switch-to-Switch link which carries traffic for all
the VLANs on each Switch. To set up a VLT, you
configure the port at each end of the link.
VLTs can only be used for links between
SuperStack
top Switch units. You cannot use VLTs for
Switch–router links.
If you specify that a port on one VLAN is a VLT port,
that port carries traffic for all the VLANs on the
on
Switch. If you then disable the VLT function on that
port, the port only carries traffic for the Default
VLAN (VLAN 1).
Virtual LANs (VLANs)
®
II Switch 1000, Switch 3000 and Desk-
5-3