4.3.6
Tagged VLAN
The 2GXM supports the IEEE 802.1Q tag VLAN packet tagging and un-tagging and the 802.1p Quality of
Service priority standards.
The following parameters are configured for each port:
4.3.6.1
Port Priority (PRI)
This (IEEE 802.1p based) user-specified value of
0
through
7
can be assigned as a QoS priority level (0
being lowest and 7 being highest) to packets ingressing (entering) a port. If no value is specified by the
user, a default priority value of “0” is assigned.
The PRI value is always assigned to all untagged packets. Tagged packets are assigned the PRI value when
the “PVID” option is selected in the “Tagged Packet Use” section.
4.3.6.2
Port VLAN ID (PVID)
This (IEEE 802.1Q based) user-specified value of 0 through 4094 can be assigned as a Port VLAN ID
(PVID) to packets ingressing a port. If no value is specified by the user a default PVID value of “2” is
assigned.
The PVID value is always assigned to untagged packets. Tagged packets are assigned the PVID value
when the “PVID” option is selected in the “Tagged Packet Use” section.
4.3.6.3
Tagged Packet Use
This section defines how tagged packets ingressing a port are processed.
Selecting the “PVID” option causes the PRI and PVID user-specified values to be used as the packet’s
VLAN ID (VID) for processing of the packet.
Selecting the “TVID” (Tagged VLAN ID) option causes the packet’s original Tag VLAN ID (TVID) and
priority level to be used as the packet’s VLAN ID (VID) for processing of the packet.
NOTE:Untagged packets are always assigned the port’s PRI and PVID values as their VID.
4.3.6.4
Ingress Security
This is a global setting for the module.
Selecting the
“Low”
option allows any packet to ingress a port.
Selecting the
“High”
option allows only packets that are assigned a VLAN ID (VID) value of which this
port is a member (according to the Membership Table) to ingress a port.
4.3.6.5
Egress Policy
Selecting the
“untag”
option defines how a tagged or untagged packet is processed. A tagged packet will
have the top tag removed and an untagged packet will be passed unmodified.
Selecting the
“tag”
option will tag an untagged packet with the PVID and PRI of the ingress port.
A tagged packet will egress without change if PVID is selected or substituted to tag if TVID is selected.
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