User's Manual

Table Of Contents

• Three-bit user priority

• One-bit canonical format indicator (CFI)

• Twelve-bit VLAN identiﬁer (VID) – Uniquely identiﬁes the VLAN to which the frame belongs

LibraPlus VLAN interfaces always transmit and receive tagged frames. Virtual LANs operate at Layer 2

(the data link layer) of the OSI model. Each VLAN maps directly to an IP network, or subnet, which

gives the appearance of involving Layer 3 (the network layer). LibraPlus supports up to 32 virtual

LAN interfaces.

4.5.1.1. Point-to-Point VLAN System

For Point-to-Point applications VLAN subinterfaces are not required, the bridge is completely trans-

parent to VLAN tags.

4.5.1.2. Point-to-Multipoint VLAN System

In this example we would like to transfer the engineering data behind the access point to a remote site

where station 1 is located.

Fig. 4.1. Multipoint VLAN Conﬁguration

Conﬁguration