VLAN Bridge Mode Description
General – Aprisa SR+ VLAN Bridge
The Aprisa SR+ works in a point-to-multipoint (PMP) network as a standard VLAN bridge with the Ethernet
and wireless / radio as interfaces and serial ports using terminal server as a virtual interface.
The Aprisa SR+ is a standard IEEE 802.1q VLAN bridge, where the FDB table is created by the bridge learning
/ aging process. New MACs are learnt and the FDB table updated. Unused MACs are aged out and flushed
automatically after the aging period.
VLANs are statically configured by the user on the ports where a Virtual LAN is required across the radio
network. An example of VLAN isolation of traffic type is shown in the figure below, where RTUs #1, 4 and 6
together with SCADA meter master form a Virtual LAN which is isolated from the other devices, even though
they are on the same physical network. VLAN management can be used to manage with external NMS all the
Aprisa SR+ devices on the radio network and is automatically created with a VLAN ID = 1 default value. The
VLAN ID can be changed by the user later.
Each device in the Aprisa SR+ bridge is identified by its own IP address, as shown in the figure.
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