CTC Union MSW-4424C Series, Руководство пользователя

Страница: 291 / 382

Chapter 4. Web Configuration & Operation
291
CHAPTER 4
WEB OPERATION & CONFIGURATION
Port: List the number of each port. “Port *” settings apply to all ports.
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 (1-4095).

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.
Port VLAN:
Configures the VLAN identifier for the port. The allowed values are from 1 through 4095. The default value
is 1.
The Port VLAN is called an "Access VLAN" for ports in Access mode and Native VLAN for ports in Trunk or Hybrid mode.
Port Type:
When you select “Hybrid” mode, the Port Type field becomes selectable. There are four port types
available. Each port type’s ingress and egress action is described in the following table.
Action
Port Type
Ingress Action Egress Action
Unaware
When a tagged frame is received on a port,
3.
If the tagged frame with TPID=0x8100, it
becomes a double-tag frame and is
forwarded.
4. If the TPID of tagged frame is not 0x8100
(ex. 0x88A8), it will be discarded.
The TPID of frame transmitted by
Unaware port will be set to 0x8100.
The final status of the frame after
egressing are also affected by egress
rule.
When an untagged frame is received on a port,
a tag (PVID) is attached and then forwarded.
C-port
When a tagged frame is received on a port,
3.
If a tagged frame with TIPID=0x8100, it is
forwarded.
4. If the TPID of tagged frame is not 0x8100
(ex. 0x88A8), it will be discarded.
The TPID of frame transmitted by C-
port will be set to 0x8100.
When an untagged frame is received on a port,
a tag (PVID) is attached and then forwarded.
S-port When a tagged frame is received on a port, The TPID of frame transmitted by S-