Transition Networks
S4224 Web User Guide
33558 Rev. C
Page 269 of 669
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. It takes effect on the
egress side. The format of ‘Ether Type’ is restricted to 0x600 - FFFF.
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 and C-tagged frames.
Discards all frames that are not classified to the Access VLAN.
On egress all frames classified to the Access VLAN are transmitted untagged. Other
(dynamically added VLANs) are transmitted tagged.
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 VLANs (1-4094).
The VLANs that a trunk port is member of may be limited by the use of Allowed VLANs
Frames classified to a VLAN that the port is not a member of are 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.
Hybrid:
Hybrid ports resemble trunk ports in many ways, but have 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 - 4094, default
being 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).