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Layer 2 Switching 41
Rapier Switch Software Release 2.2.1
C613-02013-00 Rev A
VLANs to be used with VLAN tags are created and destroyed in the same way
as VLANs with only untagged ports, by using the commands:
CREATE VLAN=vlanname VID=2..4094
DESTROY VLAN={vlanname|2..4094|ALL}
A VLAN may have VLAN-aware devices connected to some ports that require
VLAN tagging, and legacy devices connected to other ports that cannot accept
VLAN tags. Whether VLAN tagged or untagged frames are transmitted on a
port for a particular VLAN is determined when the port is added to that
VLAN. Ports are added to and deleted from VLANs using the commands:
ADD VLAN={vlanname|1..4094} PORT={port-list|ALL}
[FRAME=TAGGED|UNTAGGED]
DELETE VLAN={vlanname|1..4094} PORT={port-list|ALL}
The FRAME parameter specifies whether VLAN tag headers are included in
frames transmitted on the specified ports. If TAGGED is specified, a VLAN tag
is added to frames prior to transmission. The port is then called a tagged port
for this VLAN. If UNTAGGED is specified, the frame is transmitted without a
VLAN tag. The port is then called an untagged port for this VLAN. A port can
be untagged for one and only one of the VLANs to which it belongs, or for
none of the VLANs to which it belongs. A port can have the FRAME parameter
set to TAGGED for zero or more VLANs to which it belongs. It is not possible
to add an untagged port to a VLAN if the port is already present in any other
port-based VLAN except the default VLAN. If the port is an untagged member
of the default VLAN, adding it untagged to another VLAN deletes it from the
default VLAN. The default setting is UNTAGGED.
A port can be tagged (receive and send VLAN tagged frames) for some
VLANs, and untagged for zero or one VLAN. A VLAN can have both tagged
and untagged ports. But a particular port cannot transmit both tagged and
untagged frames for the same VLAN (that is, it cannot be added to the same
VLAN as both a tagged and an untagged port).
Figure 11 shows a network that must be configured with VLAN tagging, since
the server on port 2 on Switch A belongs to both the admin and marketing
VLANs. Using VLAN tags, port 26 on Switch A and port 25 on Switch B belong
to both the marketing VLAN and the training VLAN, so devices on both VLANs
can use this uplink.
Note that ports tagged for some VLANs and left in the default VLAN as untagged ports
will transmit broadcast traffic for the default VLAN. If this is not required, the
unnecessary traffic in the switch can be reduced by deleting those ports from the default
VLAN.