Comtech EF Data CDM-625 - Manual (Page 158)

CDM-625 Advanced Satellite Modem Revision 15
Front Panel Operation MN-CDM625
5–58
• ACT – Choose an action to undertake for the selected VLAN ID – NONE (default), Edit, or Del
(Delete).
• P1 (Port1) through P4 (Port4) – With ACT=Edit active, you may update the selected port’s
behavior attributes, as assigned under the selected VLAN ID.
You have the following options:
• View, without changing, the behavior attributes assigned to each port under the selected
VLAN ID: ACT=NONE (default).
• Edit the behavior attributes assigned to each port under the selected VLAN ID. Once the
VLAN ID targeted for editing is selected, use the ◄ ► arrow keys to select the ACT
parameter, and then use the
▲ ▼
arrow keys to select ACT=Edit.
Next, to change the behavior attribute of a specific port as needed, use the ◄ ► arrow keys to
select P1, P2, P3, or P4. Then, use the ▲▼ arrow keys to designate the attribute for that port as
Tagged or Filtered for a Trunk port, or Untagged or Filtered for an Access port.
The “Untagged” option is available only when Port Mode has been set to Access
for the selected port.
You may not designate the behavior attributes for all four ports as “Filtered” – is
this is done, and you presses ENTER to save this configuration change, an error
message will display as follows:
ERROR: Entry with FILTERED on all ports
is not allowed.
Once the port attributes have been changed (with ACT=Edit active), press ENTER to save those
changes. ENTER must be pressed to save the change. CLEAR will discard the change.
You must take into consideration, when editing VLAN table entries, the following rules:
• All Untagged/Tagged packets arriving at the LAN port are tagged (four byte VLAN “frame” is
added) with the configured VLAN ID.
• If the port is in Port Mode, any packet arriving from the WAN that matches this PVID will
have the VLAN tag removed and passed out the Ethernet.
• If the port is in Port Mode and the packet does not match the PVID, the VLAN table must be
checked to determine if the packet should pass. Packets leaving a port in Port Mode are
always untagged.
• If the port behavior Port Mode attribute is set to Trunk, then the VLAN table is referenced
to determine if the packet should pass. In this mode, packets will either be filtered
(dropped) or passed “as is” with the VLAN header intact.