Hirschmann RS20 User Manual page 150

Network Load Control
Example 2

Figure 36: Example of a more complex VLAN configuration
The second example shows a more complex configuration with 3 VLANs
(1 to 3). Along with the Switch from example 1, you use a 2nd Switch (on
the right in the example).
The simple network divides the terminal devices, A - H, of the individual
VLANs over 2 transmission devices (Switches). VLANs configured in this
manner are „distributed VLANs". When configured correctly the VLANs
allow the optional Management Station to access the network
components.
Note: In this case, VLAN 1 has no significance for the terminal device
communication, but it is required for the administration of the transmission
devices via what is known as the Management VLAN.
As in the previous example, uniquely assign the ports with their connected
terminal devices to a VLAN. With the direct connection between the 2
transmission devices (uplink), the ports transport packets for both VLANs.
To differentiate these uplinks you use "VLAN tagging", which handles the
frames accordingly. Thus, you maintain the assignment to the respective
VLANs.
Proceed as follows to perform the example configuration:
Add Uplink Port 5 to the ingress and egress tables from example 1.
Create new ingress and egress tables for the right switch, as described in
the first example.
150
8.6 VLANs
UM BasicConfig L2E
Release 8.0 05/2013