-23-
3.3.2.3 Drop Untag Per Port Setting
Enable
-
All untagged packets and priority-tagged packets are dropped. A priority-tagged packet
is treated as an untagged packet in this switch. Only VLAN-tagged packets are
admitted.
Disable
-
Disable Untagged packet filtering
3.3.2.4 Drop Tag Per Port Setting
Enable
-
All VLAN-tagged packets are dropped. A priority-tagged packet is treated as an
untagged packet in this switch. Only untagged packets are admitted.
Disable
-
Disable VLAN-tagged packet filtering
3.3.3 Ingress Default Tag Per Port Setting
Each port can be configured with one Ingress Default Tag. This ingress port default tag is used when
ingress port is in
Tag-ignore
mode or for the received untagged packets in
Tag-aware
mode. The
Ingress Default Tag includes
PVID
,
CFI
and
User Priority
configuration.
When Ingress port default tag is used, it is copied as packet associated Packet Tag Information for
VLAN classification. The PVID is used as index to one VLAN group in VLAN group table.
3.3.4 Packet Tag Information
Under VLAN process, every packet is associated with one Packet Tag information in packet forward-
ing operation. The tag information includes VID, CFI and User Priority data and is used for two
purposes:
•
The VID in tag is used as index for VLAN classification.
•
The tag is used for egress tag insertion if egress tagging is enabled.
The following table lists how the Packet Tag information is generated:
Tag Aware setting
Received Packet Type
Packet Tag information source
Tag-ignore
Untagged packet
Ingress Port Default Tag
Tag-ignore
Priority-tagged packet
Ingress Port Default Tag
Tag-ignore
VLAN-tagged packet
Ingress Port Default Tag
Tag-aware
Untagged packet
Ingress Port Default Tag
Tag-aware
Priority-tagged packet
Ingress Port Default Tag
Tag-aware
VLAN-tagged packet
Received packet VLAN Tag
