User's Manual

MDS 05-6302A01, Rev. A MDS Mercury 16E Technical Manual 19
The Serial VLAN IP address allows SCADA networks to connect to the
Serial Terminal Server on the transceiver. The terminal server provides
access to the transceiver's local COM port so IP networks can utilize
serial devices. The terminal server is only available through the Serial
VLAN IP address while VLAN is enabled. The Serial VLAN IP
Address settings are configured under the Serial VLAN Subnet Config
Menu or the Serial VLAN IP Address section on the web page.
When configuring VLAN, Ids must be assigned to the Management
VLAN, Serial VLAN, LAN 1 Port and LAN 2 Port. The Management
VLAN Id and Serial VLAN Id cannot be the same value.
The VLAN Ethport Mode parameter determines how IP frames are
handled with respect to VLAN tagging. When the mode is set to Access,
a VLAN tag is added to IP frames that are received on that Ethernet port.
In the case of the LAN 1 port, the LAN 1 VLAN ID would be added to
the frame prior to forwarding the frame over-the-air. Likewise, the tag
is removed from the IP frame for traffic that is going to be transmitted
out of the Ethernet port. This is the mode that is most likely to be used
on Subscribers where the LAN connected to the subscriber is
non-VLAN and it would be tagged before it reaches the Base Station.
When the VLAN Ethport Mode is set to Trunk, IP frames received from
the Ethernet port are not automatically tagged. It is assumed that the
LAN that is connected to the Ethport is already tagged with VLAN Ids.
This mode is most likely to be used on Base Stations where the network
connected to the Base Station Ethports are VLAN aware.
The last mode for VLAN Ethport Mode is Auto, where the Subscriber
or Base Station can automatically determine whether or not to tag
frames based on the traffic it receives.
Management VLAN Mode determines whether or not VLAN tags will
be applied to Management frames. When the mode is set to Tagged
Mode, management frame s are expected to already have the
management VLAN Id attached to them. If management frames arrive
at the trunk port without a VLAN Id and the mode is Tagged Mode, then
those frames will be ignored. In Native Mode, management frames do
not need the VLAN tag. The frames will automatically be included in
the Native VLAN, which is the management VLAN.
The Default Route IF parameter determines which VLAN will be used
to route traffic that does not yet have an entry in the ARP table. This
parameter should be set to the VLAN that typically has the most routing
to be performed since this should help route traffic quickly through that
VLAN.