coaxLAN CLM253, User Manual

Page: 20 / 61

V001
CLM253
User Manual
20 of 61 Master Unit
CLM253
Item Description
VLAN This is the column in the slave internal ports table where
you can configure ports as access ports or trunk ports. The
available options in the related combo boxes are:
Disable : no VLAN configured.
Access : The port is configured in VLAN access mode. An
access port can have only one VLAN configured on the
interface; it can carry traffic for only one VLAN. The
behaviour is as follows:

If it receives a packet tagged with a VLAN ID !=
PVID (PVID is the value configure in the PVID
column for this port), it drops the packet.

If it receives a packet tagged with a VLAN ID =
PVID, it drops the packet.

If it receives a packet untagged, it accepts the
packet and adds a tag with PVID.

If it has to transmit a packet tagged with a VLAN ID
= PVID, it forwards the packet and removes tag.

If it has to transmit a packet tagged with a VLAN
ID != PVID, it forwards the packet and removes tag.
Trunk : The port is configured in VLAN trunk mode. A trunk
port can have two or more VLANs configured on the
interface; it can carry traffic for several VLANs
simultaneously. The behaviour is as follows:

If it receives a packet tagged with a VLAN ID !=
PVID, it process the packet and doesn’t change
anything. VLAN ID has to be included in the list of
the allowed VLANs, if not the packet is dropped.

If it receives a packet tagged with a VLAN ID =
PVID, it process the packet and doesn’t change
anything.

If it receives a packet untagged, it accepts the
packet and adds a tag with PVID.

If it has to transmit a packet tagged with a VLAN ID
= PVID, it forwards the packet and removes tag.

If it has to transmit a packet tagged with a VLAN
ID != PVID, it forwards the packet and removes tag.
VLAN ID has to be included in the list of the allowed
VLANs, if not the packet is dropped.
PVID This is the column in the internal ports table where you can
configure the port VLAN ID (PVID). PVID is a tag which is
added to incoming untagged frames received on a port.
This value must be between 1 and 4095. A packet with a
VLAN ID matching PVID is inserted in the frame forwarded
through the port.