omnitron-systems-technolo gx-tm2 Manual Do Utilizador

The GX/TM2 supports the IEEE 802.1Q tag VLAN packet tagging and un-tagging (including Q-in-Q
multi-tagging) and the 802.1p Quality of Service priority standards.

The following parameters are configured for each port:

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.

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.

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.

This section selects the ingress security level of a port.

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.

This section defines the port type.

Selecting the “Tunnel” option,  sets the egress mode to “Pass” for each VID assigned to the port in the
membership table. The port is set to “Accept Tagged” frames.

Selecting the “Trunk” option, the port is set to a Egress Tag Mode of “Provider Tag”. Frames ingressing
will have the “Provider Tag” removed.

Selecting the “Access” option, sets the egress mode to “Pass” for each VID assigned to the port in the
membership table. The port is set to “Discard Tagged” frames.

The GX/TM2 allows the setting of the customer facing port (C-TAG) and the network facing port (S-TAG).
C-Tag is used by the port when Port Type is set to “Access” or “Tunnel”. The C-Tag defaults to
0x8100h.  S-TAG is used by the port when Port Type is set to “Trunk”. The S-Tag defaults to 0x8100h.  If
the S-Tag is changed the port functions as an IEEE 802.1ad S-Tag port.

Tagged VLAN is accessed by selecting option 2  from the Port configuration screen.  The Tag VLAN
Control screen will be displayed.

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