DT Etherlink IV
User Manual
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Subnet mask : 255.255.255.0
Default gateway : 0.255.255.255
SNMP:
Send traps to IP:
Community :
SET command : Enabled
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Warning: New network configuration is shown, because it differs from running.
To view new network configuration, type 'NETCONFIG N'.
To view running network configuration, type 'NETCONFIG R'.
To apply changes in configuration, type 'APPLY VLAN' or 'APPLY ALL'.
Do not forget to 'CONFIRM' a good working configuration.
CP_NET>
PBVLANs are used as a way to isolate groups of network interfaces from each other. No frames
from interface LAN2 connected to PBVLAN A will ever be forwarded to interface INT, which is
connected to PBVLAN E. And vice versa.
Each PBVLAN is a separate switching fabric. As there are 5 PBVLAN and no more than 10 network
interfaces in the modem, one can connect any WAN interface to any LAN interface exclusively, as
well as create isolated LAN-LAN or LAN-INT connections. Each PBVLAN can include from none to
all interfaces. To populate PBVLAN with interfaces, just set the appropriate PBVLAN letter for
selected interfaces.
PBVLAN isolation works only in the limits of one modem. Outside the modem, there is no
information about the PBVLAN letter the frame had inside. This is the major difference with VLANs,
where the VLAN information is carried in the VLAN tag. So, it does not hurt if WAN1, PBLAN A on
one modem is connected to WAN1, PBVLAN C on another.
PBVLAN isolation also affects aggregation of WANs in MWAN (multi-WAN). Only WAN channels
from the same PBVLAN will aggregate with each other. For example, if WAN1 and WAN3 are in
PBVLAN A, and WAN2 and WAN4 are in PBVLAN B, and all WANs go in one direction, two
MWANs will be created each consisting of 2 WANs instead of 1 MWAN with 4 WANs.
Creating a PBVLAN with only LAN ports and one WAN port will allow the modem to eliminate most
software processing of frames, creating bridge connection and thus reducing frame propagation
delay. The same applies to the case when there are several WAN ports in the PBVLAN, but they all
go in the same direction. Assigning INT port to the PBVLAN with LAN and WAN will turn on the
internal Layer2 switch. This will, however, not be sensible in most of the applications.
Most setups where LAN traffic separation is needed can be made with PBVLANs only or VLANs
only. In some setups PBVLANs way has benefits, in some the VLAN way. Mix of VLANs and
PBVLANs is also convenient in some applications. The user can select the approach.
4.6.5.53 <MODE [IF] [ACC/TRUNK/MIX]> Command
This command selects the 802.1Q VLAN mode for any LAN interface. Along with the full words
ACCESS, TRUNK and MIXED, also abbreviations can be used, for example A or ACC for ACCESS,
MIX or M for MIXED.
In ACCESS mode only untagged frames pass into (ingress) and out of (egress) the LANx port. On
ingress, frames are assigned to default VLAN tag with VID and QoS defined by QOS, VLAN and
VID commands. On egress, only frames with VLAN equal to the default VLAN of the port (set with
VLAN command) are allowed, and the VLAN tag is removed.
In TRUNK mode only tagged frames pass into and out of the LANx port. Frames are allowed to pass
on per-VLAN basis. VLANs allowed to pass are those selected with the ALLOW command (any
combination of VLAN1-8 and OTHER can be selected).
In MIXED mode tagged and untagged traffic is allowed on the port. However, on ingress, a default
VLAN tag (selected with QOS, VLAN and VID commands) is added to untagged frames so that all
frames in the system are actually tagged. On egress frames with VLAN equal to the default VLAN
(set with VLAN command) exit the port untagged, while to all other VLANs apply pass/block rules
are set by the ALLOW command.
