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245U-E Wireless Ethernet Modem User Manual
Rev Version 2.24
Management IP
The management IP is the address of the module if only one VLAN group is
configured. Access to the module’s internal Web-based configuration and
IP-based functions (such as serial gateway, or Modbus server) is provided via
this management IP address and subnet mask.
NOTE If only one VLAN group is configured, it must have a
management IP and netmask. If further VLAN groups are configured
(groups 2-9) they only need a management IP and subnet if access
to the modules IP-based functions (such as Modbus or webpages) is
required.
Management Netmask
The IP network mask of the management IP (see above).
Bridge STP
Turns on Spanning Tree Protocol (STP) for the bridge. STP prevents network
loops that can cause broadcast storms.
Bridge Priority
The STP priority number for the bridge. This value should be set in context with
other devices that are connected on the same network.
Interface Membership
Each VLAN group has a configurable interface membership list. The membership list will allow up to 12
possible interfaces to be added. The following configurable parameters will apply to each entry:
Interface
Select interface from the drop-down list to be used for the VLAN group.
Available interfaces are, Ethernet, Wireless or one of the 10 WDS Repeater
connections that correspond to configured entries on the Repeaters page.
Type
Specifies whether the interface is to support VLAN tagged or untagged
frames. When untagged is specified, all incoming frames on the interface
must be untagged, and all outgoing frames will be sent untagged. When
tagged is specified, all incoming frames must have a VLAN tag with VLAN ID
matching the configured VLAN ID for the VLAN group; all outgoing frames
on this interface will have a VLAN tag added with the configured VLAN ID
and priority for that VLAN group.
Example 1: Basic VLAN
A common use for VLAN functionality in a module is to tag data from a VLAN unaware device and send
this to a VLAN trunk. A simple example of this involves bridging between Ethernet and wireless ports
for just one VLAN. In Figure 69, the Ethernet interface is tagged and the wireless interface is untagged.
Any data arriving at the Ethernet port is expected to have VLAN tagged data with “VLAN ID 10,” and any
data sent from the Ethernet port will have the VLAN tag added. This example allows wireless data from
VLAN-unaware devices to be bridged with the Ethernet interface and have VLAN tags added (the Ethernet
connection is now part of a VLAN trunk that will send/receive data to/from other VLAN-aware devices).