Asante IntraCore 6524, Руководство пользователя

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Advanced Management
Page 4-22
VLAN Port Membership and Untagging
Port members can be added to and deleted from a VLAN Group via the VLAN
Management Menu (see “Configuring Static VLAN Groups” on page 4-26).
When you add a port to a VLAN, you configure the port to determine its
participation in the VLAN.
The VLAN Untagged Set.
When you add a port member to a VLAN, the port
is added to the untagged set by default. This means the frames sent out on this
port will be untagged. If you want the port to send tagged frames, you must
delete the port from the VLAN’s untagged set (see “Specifying Tagging or No
Tagging for a Port” on page 4-30).
No port can transmit both tagged and untagged frames on the same VLAN.
However, it is possible for a port to be a member of more than one VLAN, and
to transmit tagged frames for one VLAN and untagged frames for the other.
PVID - Egress Filtering.
For a port that receives untagged frames, you can
assign a Port VLAN ID (PVID). Assigning a PVID determines that the port
will send all untagged frames to the VLAN whose VID matches the PVID (see
“Configuring VLAN Port Attributes” on page 4-31).
Receive Frame Type.
You can specify whether a port receives all frames, or
only tagged frames. If a port is configured to receive only tagged frames, any
untagged frames received by the port are dropped. In this case, the PVID has no
meaning, and it is set to 4095. Receiving only tagged frames is especially
important for setting up inter-switch links (see “Configuring Port Receive
Frame Type” on page 4-33).
Ingress Filtering.
In addition to Receive Frame Type, you can also specify that
the port restricts traffic to only those tagged frames that have a VID of a VLAN
of which the port is a member. For example, assume the port is a member of
only one VLAN – in this case, VLAN 1. Then the port will accept only those
tagged frames that have VID 1 (see “Enabling and Disabling Port Ingress
Filtering” on page 4-33).