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CHAPTER 4: VLAN MANAGEMENT
Parameter description:
Global VLAN Configuration
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 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.
– Hybrid: Hybrid ports resemble trunk ports in many ways, but add 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.
Port VLAN: Determines the port’s VLAN ID (a.k.a. PVID). Allowed VLANs are in the range 1 through 4095, default is 1.
– On ingress, frames get classified to the Port VLAN if the port is configured as VLAN unaware, the frame is untagged, or VLAN
awareness is enabled on the port, but the frame is priority tagged (VLAN ID = 0).
– On egress, frames classified to the Port VLAN do not get tagged if Egress Tagging configuration is set to untag Port VLAN.
– The Port VLAN is called an “Access VLAN” for ports in Access mode and Native VLAN for ports in Trunk or Hybrid mode.
