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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 Allowed VLANs,
• unless VLAN Trunking 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.
Chapter 6. VLAN Management
115
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