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Allowed Access VLANs :
This field shows the VLANs that are created on the switch.
By default, only VLAN 1 exists. More VLANs may be created by using a list syntax where
the individual elements are separated by commas. Ranges are specified with a dash
separating the lower and upper bound.
The following example will create VLANs 1, 10, 11, 12, 13, 200, and 300: 1,10-13,200,300.
Spaces are allowed in between the delimiters.
Ethertype for Custom S-ports :
This field specifies the ethertype/TPID (specified in hexadecimal) used for Custom S-ports.
The setting is in force for all ports whose Port Type is set to S-Custom-Port.
Port VLAN Configuration
Port :
This is the logical port number of this row.
Mode :
The port mode (default is Access) determines the fundamental behavior of the port in
question. A port can be in one of three modes as described below.
Whenever a particular mode is selected, the remaining fields in that row will be either
grayed out or made changeable depending on the mode in question.
Grayed out fields show the value that the port will get when the mode is applied.
Access:
Access ports are normally used to connect to end stations. Dynamic features like Voice
VLAN may add the port to more VLANs behind the scenes. Access ports have the following
characteristics:
• Member of exactly one VLAN, the Port VLAN (a.k.a. Access VLAN), which by default is 1,
• accepts
untagged
frames
and
C-tagged
frames,
• discards all frames that are not classified to the Access VLAN,
• on
egress
all
frames
are
transmitted
untagged.
Trunk:
Trunk ports can carry traffic on multiple VLANs simultaneously, and are normally used to
connect to other switches. Trunk ports have the following characteristics:
• By default, a trunk port is member of all existing VLANs. This may be limited by the use
of
is enabled on the port, frames classified to a VLAN that the port is
not
a
member
of
will
be
discarded,
• by default, all frames but frames classified to the Port VLAN (a.k.a. Native VLAN) get
tagged on egress. Frames classified to the Port VLAN do not get C-tagged on egress,
• egress tagging can be changed to tag all frames, in which case only tagged frames are
accepted
on
ingress,
• VLAN
trunking
may
be
enabled.
Hybrid:
Hybrid ports resemble trunk ports in many ways, but adds additional port configuration
features. In addition to the characteristics described for trunk ports, hybrid ports have these
abilities:
• Can be configured to be VLAN tag unaware, C-tag aware, S-tag aware, or S-custom-tag
aware,
• ingress
filtering
can
be
controlled,
• ingress acceptance of frames and configuration of egress tagging can be configured
independently.
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