OPTICAL SYSTEMS DESIGN
DOC ID: 10118101
OSD2512 OPERATOR MANUAL
PAGE 188
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 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 VLANs (1-4095)
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 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
