Comtrol RocketLinx MP1204-XT, Руководство пользователя

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RocketLinx MP1204-XT User Guide : 2000644 Rev. A Configuration Pages - 145
Configuration | VLANs
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 are either
grayed out or made changeable depending on the mode in question.
Grayed out fields show the value that the port gets when the mode is applied.
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 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 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
Port VLAN
Determines the port's VLAN ID (a.k.a. PVID). Allowed VLANs are in the range 1
through 4095, 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).
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.
Items Configuration | VLANs (Continued)